This circuit, for vehicles with a 6 V battery, was found in the 1964 RCA transistors manual. Transistor 2N3054 can be replaced by a TIP41.
Found in a 1964 CQ magazine this circuit consists of an automatic telegraphic key, providing the...
This is the minimum amplifier configuration with the LM380 and can provide an output of up to 2.5...
The UM3562 integrated circuit (not very easy to find) synthesizes three types of sound that...