This circuit can work with almost any JFET. The circuit is from an Electronics Now from April 1993. It is powered by a 12 V battery, but can also be powered by 9 V.
This capacitive switch or approximation relay was found in a 1980s US publication. Power should...
Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of...
This circuit is a kind of Hertz Loop that can be used to check the operation of transmitters and...