This powerful siren is suitable for warning or alarm systems. The components are current and the transistor 3055 must be mounted on a good heat sink.
Found in Popular Electronics of January/February 1969, this transmitter has a few meters range and can...
The components of this circuit are exchanged for modern equivalent such as 470 K for the pot and...
This voltage inverter allows you to raise the voltage of a battery to values as high as 140 V...