Found in a 1969 EEE, this circuit is based on an operational amplifier of the time and on old type MOSFETs. The components support modern equivalents.
With this circuit it is possible to vary the resistance by adjusting the mark/space reaction of...
This circuit was found in an American 1980s documentation. It analyzes the exhaust gas of a...
This Colpitts crystal oscillator was found in an American publication for amateurs in the 1980s....