This old amplifying stage was found in radios and small amplifiers of the time. The circuit is from Mullard's transistor reference manual.
The transistors of this symmetrical source from an old publication can be replaced by modern...
This game was found in Radio Electronics from the 90s. The components used are common except some...
To obtain rectangular 1 kHz signals, we can have a simpler configuration, with a single amplifier, as...