This circuit was found in a Ferranti documentation from 1969. The transistors are common types of the company at the time. Smaller equivalents may be used. The output power is of the order of 150 mW.
Found in an old Elektor, this circuit uses two 7-segment displays to indicate the volume of an...
We found this circuit in a 1987 Hands On Electronics. It was indicated at the time to power...
The deviation of characteristics of this circuit normally referred to the temperature is very low....