This circuit was originally found in a Philips documentation from 1969. It is intended for sensing golf cart battery voltage. The circuit can be adapted for other types of battery vehicles.
We found this circuit in the Radio Electronics magazine of May 1977. The transformer voltage is 6...
With this circuit we can use old conventional phones on a simple internal line. The circuit has a...
This ultrasonic insect repellent was found in American documentation from the 1980s. The...