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 circuit causes an LED to flash if the monitored voltage exceeds the value set in the pot. The...
This circuit is from a Radio Electronics magazine from August 1990. The indicator module is of a...
The modified Hartley oscillator seen in the figure can generate signals ranging from 3 MHz to 10...