We found this circuit in the magazine Eletcronics Now of July 1994. The power supply is according to the relay and the transistor can be any general purpose one.
With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a...
This circuit allows you to view two low frequency signals on a single channel oscilloscope. It was...
Adafruit Raspberry Pi Perma Proto PCB Kits Adafruit kits are available from Mouser Electronics...