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 modern XTAL radio replaces the galena crystal for a germanium diode as the 1N34 or...
This circuit generates a signal that simulates the waveform of the spoken word. Its purpose is to...
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...