With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with the circuit shown in the figure. The circuit is from a 1965 Electronic Design.
In the figure we have a simple signal tracer circuit to be coupled to the volume control of an AM...
This circuit was found in documentation from the 90s, using components from that time. The...
This circuit, obtained from old documentation, allows the recovery of sulfated batteries. The...