This circuit detects when a signal reaches its peak value. The source must be symmetrical and equivalent operational amplifiers can be used. This circuit was found in an old European publication.
With the used coils and the power transistor this circuit amplifies the 5 W of a 11-meter...
This circuit can be used in PLL, frequency synthesizer in FM and VHF receivers, reducing a...
This circuit is from a Popular Electronics from the 90s. The circuit has a tone frequency...