Found in a 1964 Electronic Design, this circuit shows how to modulate a signal with a dynamic low impedance microphone. The circuit operates in the FM range (88 to 108 MHz).
This circuit was found in a 1967 Electronics World. SCRs are according the controller load,...
We found this configuration in an early 1977 publication. The PNP transistor may be the BC558 and...
This circuit of a Popular Electronics is intended to control a wiper. The circuit consists of a...