This circuit was found in a Popular Electronics from the 90s. The circuit has temperature compensation. Coil and capacitors depend on the frequency at which the circuit will be used.
This small earphone amplifier with germanium transistors was obtained in a Japanese publication from...
This powerful regulator, shown in the figure is for 5V (TTL) is suggested by Motorola and makes use...
We found this circuit in an English publication in 1991. The circuit can be assembled with...