This circuit was found in a 1960s General Electric unijunction transistor manual. The circuit can use any unijunction and the SCR is load sensitive.
This circuit functions as a thermostat triggering a relay when the boil control temperature...
The figure shows how to connect a relay to obtain the latch effect. The circuit is from an...
With this circuit it is possible to use a DC buzzer (not a transducer) as an extension of the...