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 simple bridge circuit can be used for impedance or resistance measurement using a high...
This circuit can source up to 1,000 V from a 9 V battery. Output current is very low, some...
The figure shows how to change the frequency of a 5 V LED blinking. The capacitor can have other...