This circuit was found in documentation from the 70s. We can try current JFET transistors.
This circuit has a gain of 34 dB and a good power to be used as an audio booster in cars. The...
The oscillator circuit is an ICM7556, the dual CMOS version of the 555. The frequency depends on...
Found in Popular Electronics from the 90s, this circuit can be used as a warning shield for...