This circuit was found in a Motorola documentation from 1968. The circuit makes use of FETs and bipolar of the time and can be applied to modern equivalents.
This circuit was found in old American documentation. Transistor is general purpose and relay is...
This simple alarm with latching uses a relay as the main element. The circuit is from a Radio...
This circuit is from an Italian publication called Fare Elettronica from 1987. What we have is an...