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.
This amplifier circuit for the 7 MHz band, which corresponds to the 40-meter band of radio...
This high-power circuit from a Popular Electronics of the 80's makes use of common SCRs that admit...
This circuit is from an American documentation from 1975. The single junction transistors can be...