This circuit is from a Popular Electronics from the 90s, consisting of a repeater relay for remote control of TV, which today can be done by Wi-Fi or other simpler resources.
This electronic “windsock” is operated by a magnetic switching system. It was found in a Radio...
This circuit is from a National Semiconductor manual from the 1980s. The integrated circuit is...
Two alternating are produced by this circuit. The output signal must be applied to a power stage...