This circuit triggers an alarm in the event of a power failure. The circuit is from an 80's documentation, being powered by 9 V battery. The parts are common today.
This circuit is from an old American publication. The indicated transistor is oversized as the 15 V...
This circuit was found in documentation from the 90's, having an LC compensation network. The...
A pulse applied to the input of this circuits results in a damped signal in the output. Frequency...