Indicated for discriminators adjustment in FM and VHF receivers, this circuit was found in a 90s 73 magazine for radio amateurs. The operational amplifier can be a general-purpose type.
This circuit is a continuation of the previous one, serving as a protector against overloads in...
This circuit can handle 25 A unde a 32 V voltage using a hight power old transistor. This...
This circuit was found in 80's Popular Electronics. Transistors are commonly used. The...