This circuit is used in transceivers, enabling input selection by diode switching through polarity reversal. The circuit is from an old American documentation on telecommunications.
We found this circuit in a 1968 Electronics World. The potentiometer should be set to trigger the SCR...
This circuit generates signals from 50kHz to 10MHz, depending on the crystal used. The transistors can be...
This simple light relay circuit was found in a 1988 documentation. The base is the operational 741 which has...