Found in RCA documentation from the 1970s, this circuit is intended for firing thyristors in inverter circuits. The components are from the era and the operating frequency is 10 kHz.
This circuit using an operational amplifier was found in old American documentation. It can be...
If the circuit oscillates, emitting sound, it is because the transistor is good. This simple...
Like the previous circuit, this is used in the analog part of the telephone lines. The same...