555 Interval (CB20659E)

This simple windscreen wiper interval was found in old American documentation. The relay must have contacts of at least 2 A.

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Stabilized Power Supply from 0 to 24 V x 1 A (CB12898E)
This power supply, found in an Argentine publication from the 1970s, uses a wire potentiometer of 25 W or more...
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The oscillator shown in the figure generates a 1 kHz tone that is reproduced on the speaker with...