This circuit acts on a relay disconnecting the load when the input voltage exceeds the set limit. The transformer is 12 V secondary according to the relay used.
This high voltage switched generator circuit was found in a 70s American documentation. The...
With this 1-transistor circuit we have a high input impedance and good gain. The circuit is from a...
This wireless intercom has a range of about 300 meters using an integrated circuit that is not...