This circuit is from an October 1980 Radio Electronics magazine. The circuit indicates when the maximum voltage range set by the LM3914 exceeds its end.
A configuration that can be used to do frequency division, and that uses only a current amplifier, is...
This sinusoidal oscillator with a transistor was found in a publication from the 60's. The...
This passive circuit can be used in input steps of amplifiers and other audio equipment. The...