Found in a 1967 American electronics magazine, this circuit has an input impedance of 2000 ohms. The circuit can be built with modern equivalent transistors.
This circuit sources a ramp signal with characteristic given by the diac. The circuit is powered...
The preamplifier using JFET presets a high input impedance and very low distortion. The input...
This is another one of the many debouncer circuits that the reader can find on this site, and it...