Virtually any FET can be used on this voltmeter found in old documentation. The indicator is a microamper meter 0-100 uA and the accuracy of the circuit depends on the accuracy of the resistors used.
This circuit was obtained in a 1999 documentation and makes use of common components. The circuit...
We do not know exactly what sound a flying saucer makes, or if it makes a sound! But this is not...
This oscillator for telegraphy practice was published in Radio Electronics magazine in March 1958....