This simple circuit makes use of neon lamps to indicate the voltage of a power grid. The lamps are common neon and the circuit indicates whether the voltage is 110 V or 220 V.
What we have is a powerful flasher that can be powered by voltages of 12 V like the one obtained from...
A 0 V signal initiates sampling on this circuit suggested by documentation from the 1970s. The...
This circuit is used with low impedance microphones, such as small speakers, magnetic capsules of...