Two sensors are used in this simple remote-control circuit, one to switch on and one to switch off the relay. The circuit is from 1986 documentation. The transformer has 12 V of secondary.
This circuit makes use of an integrated LM2907. The circuit is from an old documentation being...
This sensitive signal follower with an LM386 integrated circuit can be used in both audio and RF...
This transmitter, found in Raytheon documentation from 1957, has a range of a few meters. L1 can...