Hughes suggests this circuit in a 1968 documentation. The circuit uses old transistors that can be replaced with equivalents. MOSFET is the critical component of the circuit.
This telegraphy broadcast monitor delivers a signal to a speaker from a unijunction transistor...
The circuit shown has the advantage over the reductions with resistors to have a much higher...
This circuit was found in a 1977 RCA documentation. The source must be symmetrical, but the...