This circuit is from an American manual from 1975. The transistors are types of the time, but equivalents can be used, as well as the relay that can be according to the supply voltage.
Twin-T oscillators can be used to produce sinusoidal signals in the audio track with good...
November 2016 - Texas Instruments' new TPS62135 and TPS621351 step-down converters with a wide...
This circuit is from the factory manual of the LM202, an uncommon operation today. It shows how to...