Audio Kits
Audio limiter circuit schematic
This audio limiter circuit is easy to build, works with BA741 8pins or 4pins so pay attention and uses a symmetrical power supply. When the audio input level is between 20mV and 20V the output will be a constant 25mV signal. Audio limiters can be used in a transmitter schematic or in any circuit you [...]
Audio compressor SSM2165
A very simple audio compressor built with SSM2165 IC. There is no much explication about this compressor circuit schematic, just pay attention at capacitors voltage. The C8 value depends of your desired frequency amplification. Mount 7805 on a heatsink if you use higher voltages.
Audio compressor circuit components:
Stereo encoder
This simple stereo encoder circuit schematic is build with 2 IC MMC4066E and MMC4047 and one transistor BC547B. On IC1 2 and 3 pins is the audio output which is amplified by T1 ( current amplification ). On IC2 pin 10 you can find 19kHz pilot tone frequency. To adjust the frequency rotate R13 [...]
