Microphone preamp (CB22043E)

This preamp was found in an old English publication. Any usage JFET can be employed. The output is high impedance.

Digital Audio Switch (CB18255E)
With this circuit it is possible to use a control voltage to select audio signals that pass...
40608 Oscillator with divider (CB22398E)
This CMOS oscillator includes the frequency divider to generate a 400 Hz signal and a 1.6 MHz...
5.5 W amplifier - LA4420 (CB981E)
The circuit presented uses an integrated circuit Sanyo, not very common in our day. This amplifier provides...