These optical relays, which can act as a shield, were found in an American documentation from the 1980s. The circuit has a LDR sensor. It can be adapted for other types of sensors.
This Tesla coil was found in the November 1994 issue of Electronics Now magazine. T1 is a TV...
Found in a Popular Electronics from the 90s, this circuit presents the difficulty of obtaining the...
In this project, from a Japanese magazine of 1973, only one channel of a stereo amplifier of 20 W...