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.
With this circuit it is possible to activate a 12 V relay from a 6 V supply. The circuit operates as a...
This circuit is from a 1980s Motorola documentation. The circuit can be set to fire from 60 to 120...
This circuit is from a project published in the March 1996 Electronics Now magazine. The author used...