Found in an old publication about neon lamps this circuit works directly connected to the power grid, serving as an indicator for various situations. Ordinary neon lamps can be used.
This circuit is from a 2005 Linear Technology application manual. The circuit uses a commercial...
We found this circuit in an English publication from 1982. The power MOSFET can be of any type and the...
We found this circuit in a 1982 documentation. An intercom to be good must be sensitive and have...