This simple power supply, which is equivalent to 2 AAA or AA batteries, was found in an Elektor from the 90's. The transformer has a 4.5 V secondary with a current of 50 mA or more.
This Linear Technology circuit can measure currents from 100 pA to 100 uA. The circuit is from the...
April 2017 - Mouser Electronics is making available this new component for open LED protection...
Found in a 90s Popular Electronics, this circuit provides sinusoidal signals at frequencies given by the...