Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses coils and transformers hadr to find in our days. The circuit is destinated to receive MW stations.
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...