This circuit is from the 1968 ARLL documentation. The MOSFET admits equivalent and the coil determines the operating frequency range being the plug type.
This circuit was found in a 1968 General Electric documentation. It has an input impedance of 2 M ohms...
A touch of a sensor triggers this minute for a time determined by R4 and C3. Times can be between a...
This circuit decodes FSK signals with frequencies of 1070 and 1270 Hz and can be used in data...