Found in a Popular Electronics from the 1990s, this circuit monitors the voltage of a power supply or battery. The trigger voltage is adjusted with a potentiometer.
Luminus SST 20 Deep Red LED Mouser Electronics is announcing in its stock the SST-20, a 60%...
For someone who wants to take advantage of a double transformer in a good power supply, we found...
We found this simple circuit with headphones listening in Radio Electronics magazine from March...