This simple 1-transistor audio preamplifier appeared in the June 1968 Radio Electronics magazine. The transistor is a general-purpose type of the time. The gain is 14 dB.
Found in an American documentation from the 90s, this circuit works as a receiver for a data...
This experimental amplifier was found in the 1960 Mullard transistor reference manual. The...
This circuit makes use of an uncommon TTL component today, but it can be implemented with...