Found in the July 1994 Electronics Now magazine, this circuit drives a relay up to 12 V depending on the power supply. The transistor can be general purpose.
In the figure we have the way to use a common multimeter as a field strength meter. RF shock...
This is the name given to the 1969 Electronics World voltage inverter. It is a series converter...
The circuit shown is a Step-Down converter that can provide a 5 A output with 4 to 18 V inputs. The...