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 15 V regulator uses the integrated 100 mA L series. The circuit was suggested by Motorola's Linear...
S-meter is a signal strength meter used in radio transmission. Also known as Strength meter, in this...
This circuit was found in the December 1991 issue of Radio Electronics magazine. The circuit is...