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.
This circuit triggers a load that depends on the characteristics of the transistor when we touch...
This circuit was obtained from a 1965 Radio Electronics. The semiconductors used admit modern...
Found in 1967 Raytheon documentation, this circuit uses a company coupler consisting of a lamp and...