This circuit is from the Motorola Linear Databook of 1990. The coils must be according to the frequency of the signal.
This circuit was originally designed to be used in the car. When talking, the sound of the voice...
The transistor for this flashlight brightness control may be the BD135. The circuit is from 1978...
We found this circuit in Radio Electronics magazine from October 1966. The circuit uses a 15 V...