Audio Kits
VOX circuit schematic
VOX is a switch ordered by voice, often used at microphones instead of the classic switch button. The vox described here may be connected to almost any type of audio equipment which has an external speaker for coupling.
The threshold action is set with volume potentiometer of the audio amplifier which commands the [...]
Talk Over circuit schematic
A very usefull talk over circuit which you can use in your radio stations, club or anywhere you want to speak over music without any movement of potentiometers. Just talk in your microphone and the music level will drop accordingly to your voice.
Talk-over circuit schematic:
Stereo encoder High Separation
A higher channel separation stereo encoder built with 3 iC’s 4066, 4047, 4013 and 741. It has a filter L, C5 for frequencies higher than 15kHz and an extra audio amplifier built with 741. This stereo coder has a better design than this stereo circuit encoder but the principles are the same.
Stereo Encoder schematic components:
