WavePad Sound Editor Master's Edition v6.37 Portable WavePad Sound Editor Master's Edition v6.37 Portable

This audio editing software is a full featured professional audio and music editor for Windows and Mac OS X. It lets you record and edit music, voice and other audio recordings. When editing audio files you can cut, copy and paste parts of recordings then add effects like echo, amplification and noise reduction. WavePad works as a wav or mp3 editor but it also supports a number of other file formats including vox, gsm, wma, real audio, au, aif, flac, ogg and more. 

Audio Editor Features

    Sound editing functions include cut, copy, paste, delete, insert, silence, autotrim and more

    Audio effects include, amplify, normalize, equaliser, envelope, reverb, echo, reverse and many more

    Integrated VST plugin support gives professionals access to thousands of additional tools and effects

    Recommended Free VST Plugin Effects

    Includes free sound effect and music library

    Supports almost all audio and music file formats including mp3, wav, vox, gsm, wma, au, aif, flac, real audio, ogg, aac, m4a, mid, amr and many more

    Batch processing allows you to apply effects and/or convert thousands of files as a single function

    Tools include spectral analysis (FFT), speech synthesis (text-to-speech) and voice changer

    Audio restoration features including noise reduction and click pop removal

    Supports sample rates from 6 to 196kHz, stereo or mono, 8, 16, 24 or 32 bits

    Includes its own CD ripper with 'ultrafast' rip mode and cddb music database lookup

    Works directly with MixPad multi-track audio mixing, Zulu DJ software and Express Burn CD Recorder.

    Easy to use interface will have you editing in minutes 

Typical Audio Editing Applications

    Software audio editing for studios and professional journalists.

    Edit sound files to broadcast over the internet with the BroadWave Streaming Audio Server

    Normalizing the level of audio files during mastering before burning to CD.

    Editing mp3 files for your iPod, PSP or other portable device.

    As a music editor (includes ringtones creator formats).

    Music editing and recording to produce mp3 files.

    Voice editing for multimedia productions (use with our Video Editor).

    Restoration of audio files including removing excess noise such as hiss and hums. 

Made With Turbo Studio

Size: 8.78 MB

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Cool Record Edit Deluxe v9.1.2 Portable Cool Record Edit Deluxe v9.1.2 Portable

TOP-QUALITY Audio Recording and editing software

Cool Record Edit helps you transfer tapes, LPs, live performances, Internet radio, TV, DVD, or any other sound source to your hard drive. The software helps protect your valuable recordings--just set the sound source, the recording quality, and volume, then start recording.

The Editor allows you to perform various operations with audio data such as displaying a waveform image of an audio file, filtering, applying various audio effects and more. It includes a click and crackle filter for cleaning vinyl records, a noise filter for cassette-tape recordings, and an equalizer to enhance the sound quality of all recordings.

• Make high-quality audio recordings from any external source

Cool Record Edit Deluxe helps you transfer tapes, LPs, live performances, Internet radio, TV, DVD, or any other sound source to your hard drive. The software helps protect your valuable recordings--just set the sound source, the recording quality, and volume, then start recording.

• Enhance the sound quality

The Editor allows you to perform various operations with audio data such as displaying a waveform image of an audio file, filtering, applying various audio effects and more. It includes a click and crackle filter for cleaning vinyl records, a noise filter for cassette-tape recordings, and an equalizer to enhance the sound quality of all recordings.

• Support all major audio formats

Cool Record Edit Deluxe supports a wide range of audio formats, such as MPEG (MP3, MP2), WAV, Windows Media Audio, Ogg Vorbis, Audio Tracks and Dialogic VOX. It is easy to convert an audio file from one format to another.

• Audio CD Ripper and CD Burner inside

You can use the build-in CD ripper to copy all or some of your music tracks from your personal CD collection. Or, use build-in CD burner to burn your recordings to CD!

Key Features:

• Recording. Record new audio file from a microphone or another sound source.

• Editing. Open, create and save audio files. Play an audio file or any part of it. Visually edit an audio file (Cut, Copy, Delete, Paste, Paste From File, Mix, Mix From File and Insert or Delete noise or silence in an audio file).

• Display. Display a waveform window of an audio file and apply zooming.

• Digital effects. Apply different effects (Amplify, Delay, Equalizer, Fade, Flanger, Invert, Normalize, Reverse, Multi Tap Delay, Silence, Stretch, Vibrato, Echo, Chorus)

• Audio filters. Apply different filters to the selected part of an audio file (Ban Pass Filter, High Pass Filter, High Shelf Filter, Low Pass Filter, Low Shelf Filter, Notch Filter)

• Support all major audio formats. Cool Record Edit Pro supports a wide range of audio formats, such as MPEG (MP3, MP2), WAV, Windows Media Audio, Ogg Vorbis, Audio Tracks and Dialogic VOX. It is easy to convert an audio file from one format to another

• Ease of use. Cool Record Edit Pro provides a customizable interface, allowing you to build projects the way you want. It also supports standard Windows keyboard commands and mouse shortcuts

• Markers. Use markers in your audio file to quickly select between different selections!

• Selection tool. Select a part of your audio file precisely with the selection tools of Cool Record Edit Pro

• Build-in Powerful Audio Tools:

Audio Converter

When you click the Tools > Audio Converter menu item, you can access easy-to-use, yet very powerful, features for converting one file type to another. Supported conversions include the following:

* WAV to MP3

* MP3 to WAV

* WAV/MP3 to WMA

* WMA to WAV/MP3

* OGG to WAV/MP3

* WAV/MP3 to OGG

* WAV Compression

* MP3 Compression

CD Ripper

When you click the Tools > Audio CD Ripper item, you can makes direct digital copies from audio CDs and saves them as MP3, WMA, OGG, and WAV. Supported CDDB and ID3 Tag.

CD Burner

When you click the Tools > Audio CD Burner item, you can use the Audio CD Burner to burn custom high-quality CDs from your favorite MP3s and play them back in your car or home stereo or portable CD player! It is fairly simple to use and just a couple of clicks will get you burning. Have more fun with your downloaded MP3 and 'ripped' mp3s or the sound have recorded!

Made With Turbo Studio

Note:

1- Disable the internet while register

2- Use serial that included if needed

3- Enjoy!

Size: 24.6 MB

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Rangkaian Amplifier 8 Watt dari IC TDA2030 Rangkaian Amplifier 8 Watt dari IC TDA2030

Rangkaian Amplifier 8Watt dari IC TDA2030 ini sangat sederhana, bisa untuk audio komputer anda atau radio juga media player dan lain lain. Untuk stereo anda tinggal membuat satu lagi rangkaian seperti ini.

Notes:
Although the TDA2030 is capable of delivering 20 watts of audio power, I deliberately reduced the output to about 8 watts to drive 10 watt speakers. This is more than adequate for a smaller room. Input sensitivity is 200mV. Higher input levels naturally will give greater output, but no distortion should be heard. The gain is set by the 47k and 1.5k resistors. The TDA2030 IC is affordable and makes a good replacement amplifier for low to medium audio power systems. Incidentally, it is speaker efficiency that determines how "loud" the sound is. Speaker efficiency or sound pressure level (SPL) is usually quoted in dB/meter. A speaker with an SPL of 97dB/m will sound louder than a speaker with an SPL of 95dB/m.

Source:  http://www.zen22142.zen.co.uk

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High Quality Intercom High Quality Intercom

Skema Rangkaian Interkom Kualitas Tinggi

Kumpulan Skema Elektronika- Interkom Kualitas Tinggi. This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) relay circuit. Only 2 wires are required to connect the units together. Due to the low output impedance of the mic preamp, screened cable is not necessary and ordinary 2 core speaker cable, or bell wire may be used.

The schematic can be broken into 34 parts, power supply, mic preamp, audio amplifierand PTT circuit. The power supply is designed to be left on all the time, which is why no on / off switch is provided. A standard 12 V RMS secondary transformer of 12VA will power the unit. Fuses are provided at the primary input and also secondary, before the rectifier. The 1 A fuse needs to be a slow blow type as it has to handle the peak rectifier current as the power supply electrolytics charge from zero volts.

The microphone amplifier is a 2 transistor direct coupled amplifier. BC108B transistors will work equally well in place of the BC109C transistors. The microphone used is a 3 terminal electret condenser microphone insert. These are popular and require a small current to operate. The preamp is shown in my audio circuit section as well, but has a very high gain and low distortion. The last transistor is biased to around half the supply voltage; this provides the maximum overload margin for loud signals or loud voices. The gain may be adjusted with the 10k preset. Sensitivity is very high, and a ticking clock can easily be heard from the distantloudspeaker.

The amplifier is based on the popular National Semiconductor LM380. A 50 mV input is all that's required to deliver 2W RMS into an 8 ohm loudspeaker. The choice of loudspeaker determines overall sound quality. A small loudspeaker may not produce a lot of bass, I used an old 8 inch radio loudspeaker. The 4.7u capacitor at pin 1 of the LM380 helps filter out any mains hum on the power supply. This can be increased to a 10u capacitor for better power supply rejection ratio.

The push to talk (PTT) circuit is very simple. A SPDT relay is used to switch between mic preamplifier output or loudspeaker input. The normally closed contact is set so that each intercom unit is "listening". The non latching push button switch must be held to talk. The 100u capacitor across the relay has two functions. It prevents the relays back emf from destroying the semiconductors, and also delays the release of the relay. This delay is deliberate, and prevents any last word from being "chopped" off.

Setting Up and Testing
This circuit does not include a "call" button. With this intercom pressing the Push to Talk button sends your voice to the opposite station, and vice versa. Setup is simple, set to volume to a comfortable level, and adjust the mic preset while speaking with "normal volume" from one meter away. You do not need to be in close contact with the microphone, it will pick up a conversation from anywhere in a room. If the units are a long way away, there is a tendency for the cable to pick up hum, or radio interference. There are various defenses against this. One way is to use a twisted pair cable, each successive turn cancels the interference from the turn before. Another method is to use a small capacitor of say 100n between the common terminal of each relay and ground. This shunts high frequency signals to earth. Another method is to use a low value resistor of about 1k. This will shunt interference and hum, but will shunt the speech signal as well. However as the output impedance of each mic preamp is low, and the speech signals are also low,this will have little effect on speech but reduce interference to an acceptable level.

Source:  www.zen22142.zen.co.uk 

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Doorphone Intercom Doorphone Intercom

Skema Rangkaian Interkom Pintu Sederhana

Description:

Kumpulan Skema Elektronika- Interkom Pintu Sederhana,

A simple Intercom made with a single transistor and low power audio amplifier LM386. The circui uses 8 ohm speakers, which also double as a microphone.

Circuit:
For the first time, this circuit was is a Canadian/English design and designed by Mr Laurier Gendron of Burnaby in British Columbia, Canada, and myself. Please make sure you visit Laurier's web site, Handy Dandy Little Circuits. This page is also available in French by clicking on the flag.


In this doorphone circuit, an 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, providing low input impedance to match the speaker and good voltage gain.
The 270k resistor provides simple DC bias and the load resistor is 27k. The speaker produces a weak varying DC output when used as a microphone typically several 100uV. This varying DC signal must be separated from the fixed DC bias voltages and this is done by the 100u and 0.47u capacitors.
An LM386 is used in non-inverting mode as a power amplifier to boost voltage gain and drive the 8 ohm speaker. The 10k potentiometer acts as the volume control, and overall gain may be adjusted using the 5k preset. The gain of the LM386 can be as high as 200, this is required because of the small audio signal from the speaker. The double pole double throw switch, reverses the loudspeaker positions, so that one is used to talk and the other to listen. Manually operating the switch (from inside the house) allows two way communication.

Source:  www.zen22142.zen.co.uk

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Rangkaian Power Amplifier 1000 Watt Rangkaian Power Amplifier 1000 Watt

Kumpulan Skema Elektronika. This is a audio power amplifier Blazer circuit provides up to 1000Watt . This interesting routes many good bass and treble alive. Importantly should choose Power supply source, which has been fairly high voltage class 70Vdc GND -70V 10A is the current low level

Skema Rangkaian Power Amplifier Blazer 1000 Watt

The transistors are 2SC3858 (NPN) and 2SA1494 (PNP), and feature high bandwidth, excellent safe operating area, high linearity and high gain. Driver transistors are 2SC5200 (NPN) and 2SA1943 (PNP). All devices are rated at 230V, with the power transistors having a 150W dissipation and the drivers are 50W.

This circuit describes an amplifier, power supply and tests procedures that are all inherently dangerous. Nothing described in this article should even be considered unless you are fully experienced, know exactly what you are doing, and are willing to take full 100% responsibility for what you do. There are aspects of the design that may require analysis, fault-finding and/or modification.

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Skema Rangkaian 400W MOSFET Amplifier Skema Rangkaian 400W MOSFET Amplifier

Kumpulan Skema Elektronika. These amplifiers circuit can be used for virtually any application that requires high performance, low use Noise, distortion and excellent sound quality. Examples would be subwoofer amplifier should FOH stage Amplifiers, surround a canal a very powerful sound amplifier, etc. The 400W MOSFET-amplifier has four key stages of amplification. We are looking to start any Phase appropriate detail.

Skema Rangkaian 400W MOSFET Amplifier

Note:

• Use + /-70V 10A DC dual supply for powering the circuit.
• For L1 make 12turns of enameled copper wire on a 1cm him: plastic formers.
• use 8 x IRFP448 MOSFETs in the final stages
• Heat sink is Necessary for the MOSFETs. A 8x4x4 inch finned aluminum heat sink will do. There is no such thing as a heat sink That is too large.

As the name suggests All Q ,C and ZD the Bias and buffer phases. Its main goal is to provide a stable MOSFET Gates and offset voltage and the voltage buffer amplifier stage of the High Resource capacity. What would have without the phase response and the effect Slew rate is indeed very bad. The flip side of the coin is not the extra step Introduction of an additional dominant pole in the amplifier feedback loop.

Also to what the name suggests this stage converts the voltage developed in the VAS and provides all the amps required to drive at 8 or 4 ohms. 2-ohm loads are possible for several minutes at a time. In fact, I have tested more than 1600 1kW amplifier Watts RMS at 2 ohms. But that would not be recommended as a long-term exposure at all. If it is higher than the figures of the STI-amp. Power to the AV amplifier 800 The components of the power for this amplifier are as follows, and are favored A channel or a power module alone. 1 toroidal transformer with a rating of 1kVA. Primary windings are made to fit

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Power Amplifier for Laptop Power Amplifier for Laptop

Usually, the audio output from a laptop’s built-in speakers is low. A power amplifier is required to get a high volume. Here is a simple circuit to amplify the laptop’s audio output. The circuit is built around power amplifier IC LA 4440 (IC1) and a few other components. LA4440 is a dual channel audio power amplifier. It has low distortion over a wide range of low to high frequencies with good channel separation. Inbuilt dual channels enable it for stereo and bridge amplifier applications.


In dual mode LA4440 gives 6 watts per channel and in bridge mode 19- watt output. It has ripple rejection of 46 dB. The audio effect can be realized by using two 6-watt speakers. Connect pins 2, 6 and ground of IC1 to the stereo jack which is to be used with the laptop. Assemble the circuit on a general-purpose PCB and enclose in a suitable cabinet. The circuit works off regulated 12V power supply. It is recommended to use audio input socket in the circuit board. Use a proper heat-sink for LA4440.

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Skema Rangkaian Active Crossover Circuit Skema Rangkaian Active Crossover Circuit

This alive Cantankerous over is adequately beeline forward. It consists of a absorber and two 3rd order, 18 dB per octave filters. One low canyon and the added high. The cantankerous over abundance is set at 2Khz and is advised for AEK’s 400watt per access PA/Keyboard Amp systems. Obviously alone one access is apparent here.
The band akin audio arresting enters the absorber area it is astern out of phase. This is to atone for
the filters which will alter the appearance afresh appropriately abiding the arresting to it’s able phase. The filters are more-or-less accepted low and aerial canyon filters appropriately however, added capacitors and resistors accept been added in adjustment to get the altruism bottomward to a minimum appliance alone E12 components.
This ambit may not be of awfully abundant use to anyone as it was accurately advised to clothing the applications. It is not capricious or switchable for two reasons. Firstly, it didn’t charge to be back the backdrop of the apostle arrangement were already known. And secondly, the added complication was put into the accurateness of the crossover rather than it’s flexibility. The filters are akin in account to anniversary added as able-bodied as can be accepted appliance alone E12 components. If switching were to be active to accord a ambit of abundance options, a accommodation would accept to be fabricated on clarify accuracy.
The alone added way to accomplish a accepted crossover architecture and advance accurateness would apparently be to use Switched capacitor clarify architecture blocks. In theory, two 18or 24dB per octave filters could be complete such that they tracked anniversary added by actuality bound to the aforementioned clock. This would be a nice agreement but I haven’t had the befalling to prove this technology for this affectionate of application. My primary affair was the breach through of switching babble appliance such a design.
Therefore this architecture represents the simplest access I could booty and still get the adapted outcome.

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300W Subwoofer Power Amplifier Wiring Diagram 300W Subwoofer Power Amplifier Wiring Diagram

Please agenda that the blueprint for this amp has been upgraded, and it is now recommended for connected aerial ability into 4 Ohms, but You will charge to go to extremes with the heatsink (fan cooling is awful recommended). It was originally advised for “light” alternate duty, acceptable for an equalised subwoofer arrangement (for archetype application the ELF assumption – see the Project
Page for the advice on this circuit). Where connected aerial ability is required, addition 4 achievement transistors are recommended, active in the aforementioned way as Q9, Q10, Q11 and Q12, and application 0.33 ohm emitter resistors.
Continuous ability into 8 ohms is about over 150W (250W for ±70V supplies), and it can be acclimated after added transistors at abounding ability into an 8 ohm amount all day, every day. The added transistors are alone bare if you appetite to do the aforementioned affair into 4 ohms at best accumulation voltage! Do not alike anticipate about application food over ±70V, and don’t bother allurement me if it is ok – it isn’t!
The ambit is credible in Figure 1, and it is a analytic accepted design. Connections are provided for the Internal SIM (published abroad on the Project Pages), and clarification is provided for RF aegis (R1, C2). The ascribe is via a 4.7uF bipolar cap, as this provides lots of capacitance in a baby size. Because of the impedance, little or no abasement of complete will be apparent. A polyester cap may be acclimated if you adopt – 1uF with the nominal 22k ascribe impedance will accord a -3dB abundance of 7.2Hz, which is absolutely low abundant for any sub.

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Rangkaian Loudness Aktif Rangkaian Loudness Aktif

Skema Rangkaian Loudness Aktif

To get good audio reproduction at different listening levels, a different tone-setting controls should be necessary to suit the well known behavior of the human ear. In fact, the human ear sensitivity varies in a non-linear manner through the entire audible frequency band, as shown by Fletcher-Munson curves.

A simple approach to this problem can be done inserting a circuit in the Preamplifier stage, capable of automatically varying the frequency response of the entire audio chain in respect to the position of the control knob,
in order to keep ideal listening conditions under different listening levels .

Fortunately, the human ear is not too critical, so a rather simple circuit can provide a Satisfactory performance through a 40db range.

List Component Of Loudness Aktif

P1______________10K Linear Potentiometer (Dual-gang for stereo)

R1,R6,R8_________100K 1/4W Resistors
R2______________27K 1/4W Resistor
R3,R5____________1K 1/4W Resistors
R4______________1M 1/4W Resistor
R7______________20K 1/2W Trimmer Cermet

C1______________100nF 63V Polyester Capacitor
C2______________47nF 63V Polyester Capacitor
C3______________470nF 63V Polyester Capacitor
C4______________15nF 63V Polyester Capacitor
C5,C9____________1µF 63V Electrolytic or Polyester Capacitors
C6,C8____________47µF 63V Electrolytic Capacitors
C7______________100pF 63V Ceramic Capacitor

IC1_______________TL072 Dual BIFET Op-Amp

SW1________________DPDT Switch (four poles for stereo)


The circuit is shown with SW1 in the "Control-flat" position, ie without the Automatic Loudness Control. In this position the circuit acts as a linear Preamplifier stage, with the voltage gain is set by means of Trimmer R7. Switching SW1 in the opposite position the circuit becomes an Automatic Loudness Control and its frequency response varies in respect to the position of the control knob by the amount shown in the table below. C1 boosts the low frequencies and C4 boosts the higher ones. Maximum boost at low frequencies is limited by R2; R5 do the same at high frequencies.

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Rangkaian Mixer Mini Rangkaian Mixer Mini

 Although the modular Portable Mixer design available on these web pages has become a hit for many amateurs, some correspondents required a much simpler device, mainly for mixing mono signals.
This design should fulfil their needs, featuring three inputs with switchable high/low sensitivity and unusual level-control circuits, providing high overload margins and low-noise figures, proportional to gain-level settings.
Low current consumption due to a simple, five-transistor circuitry, allows the Mini Mixer to be powered by a common 9V PP3 battery for many hours.

Mini Mixer Parts:
P1,P2,P3_________5K Linear Potentiometers
R1,R11,R15_____180K 1/4W Resistors
R2,R12,R16_______2M2 1/4W Resistors
R3,R13,R17_____750R 1/4W Resistors (See Notes)
R4,R14,R18_______1K 1/4W Resistors
R5______________15K 1/4W Resistor
R6_____________220R 1/4W Resistor
R7_______________1K5 1/4W Resistor
R8_____________820R 1/4W Resistor
R9_____________150R 1/4W Resistor
R10____________100K 1/4W Resistor
C1,C6,C8_________1µF 63V Polyester or Electrolytic Capacitors
C2,C4,C7,C9____100µF 25V Electrolytic Capacitors
C3,C5__________220µF 25V Electrolytic Capacitors
Q1,Q4,Q5______BC550C 45V 100mA Low noise High gain NPN Transistors
Q2____________BC547 45V 100mA General purpose NPN Transistor
Q3____________BC557 45V 100mA General purpose PNP Transistor
J1,J2,J3________3mm or 6mm Mono Jack sockets
SW1,2,3,4______SPST Toggle or Slider Switches
B1_______________9V PP3 Battery
Clip for PP3 Battery

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Car Subwoofer Amplifier Driver Car Subwoofer Amplifier Driver

The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio.
Then, a 12dB/octave variable frequency Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz.
Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.
Parts List:
P1_____________10K Log Potentiometer
P2_____________22K Dual gang Linear Potentiometer
R1,R4___________1K 1/4W Resistors
R2,R3,R5,R6____10K 1/4W Resistors
R7,R8_________100K 1/4W Resistors
R9,R10,R13_____47K 1/4W Resistors
R11,R12________15K 1/4W Resistors
R14,R15,R17____47K 1/4W Resistors
R16_____________6K8 1/4W Resistor
R18_____________1K5 1/4W Resistor
C1,C2,C3,C6_____4µ7 25V Electrolytic Capacitors
C4,C5__________68nF 63V Polyester Capacitors
C7_____________33nF 63V Polyester Capacitor
C8,C9_________220µF 25V Electrolytic Capacitors
via: redcircuit
C10___________470nF 63V Polyester Capacitor
C11___________100nF 63V Polyester Capacitor
C12__________2200µF 25V Electrolytic Capacitor
D1______________LED any color and type
Q1,Q2_________BC547 45V 100mA NPN Transistors
IC1___________TL072 Dual BIFET Op-Amp
IC2_________TDA1516BQ 24W BTL Car Radio Power Amplifier IC
SW1____________DPDT toggle or slide Switch
SW2____________SPST toggle or slide Switch capable of withstanding
a current of at least 3A
J1,J2__________RCA audio input sockets
SPKR___________4 Ohm Woofer or two 8 Ohm Woofers wired in parallel

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Guitar Amplifier Schematic Diagram 100W Guitar Amplifier Schematic Diagram 100W

The power amp board has remained unchanged since it was first published in 2002. It certainly isn’t broken, so there’s no reason to fix it. The photo below shows a fully assembled board (available as shown as M27). Using TIP35/36C transistors, the output stage is deliberately massive overkill. This ensures reliability under the most arduous stage conditions. No amplifier can be made immune from everything, but this does come close.
The power amp (like the previous version) is loosely based on the 60 Watt amp previously published (Project 03), but it has increased gain to match the preamp. Other modifications include the short circuit protection – the two little groups of components next to the bias diodes (D2 and D3). This new version is not massively different from the original, but has adjustable bias, and is designed to provide a “constant current” (i.e. high impedance) output to the speakers – this is achieved using R23 and R26. Note that with this arrangement, the gain will change depending on the load impedance, with lower impedances giving lower power amp gain. This is not a problem, so may safely be ignored.
Should the output be shorted, the constant current output characteristic will provide an initial level of protection, but is not completely foolproof. The short circuit protection will limit the output current to a relatively safe level, but a sustained short will cause the output transistors to fail if the amp is driven hard. The protection is designed not to operate under normal conditions, but will limit the peak output current to about 8.5 Amps. Under these conditions, the internal fuses (or the output transistors) will probably blow if the short is not detected in time.

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Rangkaian Power Amplifier BTL Rangkaian Power Amplifier BTL

Gambar Rangkaian Power Amplifier BTL

Audio amplifiers operate either in a BTL (bridged) or single-ended ("normal") configuration. In the single-ended setup, the output lead goes to the "hot" or "+" side of the load (speaker or speaker box since we are talking audio) and the "-" or "negative" side of the load is tied to a common ground shared with the amplifier. In the BTL configuration, one amp is connected to the "+" side of the speaker (load) and a second amp is connected to the "-" side of the load. For this to work, the output signal from the second amplifier must be a "mirror image" (identical in every respect, but 180 degrees out of phase) of the output from the first amp. The BTL configuration is most often seen in low-voltage, battery-powered applications (like cell phones or "walkman" type personal tape or cd players etc) or in automotive applications over about 10 watts per channel.

In the BTL configuration, each amp drives half the load impedance. With the signals being out of phase, the voltage swing across the load appears to be doubled, and with each amp driving half the impedance the current is doubled. In theory the bridged pair will produce 4 times the power into the load that either amp acting alone could provide. In reality it seldom works that well.

This is an power amplifier circuit of a BTL system, which comprises a first op-amp chip which outputs an output signal having a same phase as an input signal input to a signal input terminal, a second operational amplifier which outputs an output signal having an opposite phase to the input signal, a voltage divider which generates a midpoint voltage of the input signal, a first resistor connected between an output terminal and a negative phase input terminal of the first operational amplifier, second and third resistors connected in series between the negative phase input terminals of the first and second operational amplifiers, a fourth resistor connected between an output terminal and the negative phase input terminal of the second operational amplifier, and an impedance converter connected between a midpoint voltage node of the voltage divider and a series-connection node of the second and third resistors. (end of abstract)

List Componet:
R1, R2,R3, R4, R6..................... 10kOhm.
R3............................................. 20kOhm.
C1, C2, C3, C4........................... 10µF.
Catu daya (VCC) ±12 V.

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Rangkaian Treble boost Rangkaian Treble boost

This is Treble Boost circuit. IC LM741 that excellent like to use general the price economizes , and use electronics other equipment assemble a little. In this circuit has can to improve the treble about 10000 Hz that 40 dB. By you can change C1 be other value as a result , will affect the treble differently. This circuit uses the fire feeds about 9V. See the circuit and read to add.

Skema rangkaian treble boost

Note:

• Use 12V to 16 VDC for powering the circuit.
• Mount IC1 on a holder.
• C3,C3,c4 and C5 must be rated at least 25V.

IC Op-Amp LM741

The LM A741 is a high performance monolithic operational amplifier constructed on a single silicon chip. It is intented for a wide range of analog applications.




Absolute maximum rating

Supply voltage (VCC) ±22 V.
Differential Input Voltage (Vid ) ±30 V.
Input Voltage (Vi ) ±15 V.
Power Dissipation (Ptot) 500 mW.
Storage Temperature Range (Tstg) -65 to +150 °C.

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20 Watt Power Amplifier 20 Watt Power Amplifier

This IC chip was designed specifically for use in power boosting applications in automobiles. It is self protecting against short circuits and thermal problems. In the bridge configuration shown it will deliver 20 watts of power into a 2 ohm speaker operating at 14.4 volts.

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