This circuit of a Popular Electronics is intended to control a wiper. The circuit consists of a relaxation oscillator with unusual component. The relay must be sensitive.
This circuit is suggested by Texas Instruments in old documentation. The components depend on the...
Found in an old English documentation, this circuit is intended to amplify signals in the 2-meter ham...
This circuit indicates the logic level of a digital signal. LEDs can replace the lamp, wired with...