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.
The purpose of this circuit is only to increase the input resistance of a multimeter, since there...
September 2017 - The new LDOs of STMIcroelectrinics LDLN025 for currents up to 250 mA and 1.5 to...
This circuit was found in the November 1987 Radio Electronics magazine. The trigger voltage is...