Audio Kits
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 [...]
Peak indicator circuit schematic TLC272
This peak indicator circuit signals thru 2 led’s the exceeding of a pre-estabilished value of any stereo audio channel.
Signals from the 2 channels are rectified (monoalternance) with D1 and D2 and the resulted voltage is applied on OA IC TLC272 inversor entries.
The peak indicator circuit can be used up to 20kHz frequency and the current [...]
Reverberator with TDA1022
The first reverberator we present is based on TDA1022, the most used BBD.
Reverberator adjustements for proper functionality:
Before we connect the power supply, extract IC2 and IC3 from its base and adjust the potentiometers to middle position. On one of IC2 or IC3 entries connect a frequency-meter and/or oscilloscope. On oscilloscope monitor will be visualized [...]
