Found in a 1966 General Electric documentation, this circuit controls an incandescent lamp from an audio signal. The circuit works like a rhythmic light.
This interesting AC / AC converter is only indicated for resistive loads and was obtained in a...
This 1967 Raytheon circuit uses a Raystor, an optical coupler with a lamp and an LDR. The circuit...
This electronic voltmeter circuit was found in a documentation from the 50's. The sensitivity is...