This trigger circuit was found in an American documentation from the 1980s. The amplifiers used can be replaced by equivalents with characteristics according to the frequency.
The time the output is high (1) of a TLCSSB in the astable configuration depends on Ra and C. The...
We found this treble booster circuit in a Radio Electronics magazine from February 1970. It uses...
This power supply with several transistors can supply a current of several amps and a voltage of...