This circuit was obtained in a 1980s publication, but it can be easily assembled today, as all components are common. The transformer is 12 + 12 V with at least 1 A and the diodes 1N4002.
When the phone rings, a high-powered incandescent light comes on. This circuit can be interesting to...
The sensors and integrated circuit used in this circuit are uncommon today. However, it is worth...
This oscillator produces a signal with a central frequency in 1 MHz. This frequency can be...