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.
The time constant of this circuit is 100 x R1 x C1, which leads to the possibility of obtaining times...
This circuit with a double-gate MOS transistor was found in a Popular Electronics from the 90's....
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...