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 English publication of 1982. The bipolar transistor can be a BC548 and the...
This circuit sequentially drives loads connected to its outputs or even applies the signals to the...
This low-pass filter was found in Intersil documentation from the 1980s. The circuit makes use of...