This is the circuit for the HM-10ª, an instrument sold by Heathkit. The circuit is from a Radio Electronics from May 1963. The indication is by an analog instrument.
This circuit was obtained in a 1975 documentation. It is intended for old vehicles that still use...
A Schmitt trigger inverter can be obtained from each gate of the 4093 with the connection shown in the...
In the figure we have a typical voltage follower. In a voltage follower the voltage gain is...