This circuit is from a 1980's documentation for telecommunications. The circuit is used in SSB and the diodes must be suitable types for the application. The audio input is low impedance.
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...