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.
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V...
The trip circuit for this alarm is given in CB16765E. The circuit uses common components and acts...
We found this circuit in a technical documentation on thyristors from the 70s. The circuit is set...