This car battery monitor was featured in the January 1988 issue of Radio Electronics magazine. The circuit uses common transistors and has 3 levels of indication made with common LEDs.
This amplifier stage with 1 power transistor was found in the Radio Electronics magazine of...
This circuit provides an audible signal in a crystal transducer. The circuit is controlled by an...
This circuit is from an Electronics Now from August 1995. The triac is according to the load that...