This 2002 circuit makes it possible to leave the soldering iron with two temperatures. Normal, for work and semi-heated on standby with less energy consumption.
With the circuit shown it is possible to measure very low resistances, of the order of fraction of ohm,...
The operational amplifier used in this circuit is no longer common on the market, as the circuit is...
The circuit shown in the figure makes use of an LM3909, a low consumption and low voltage IC. The...