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.
Two of the four gates of a 4011 is used in this biestable touch circuit. Do not use a power source...
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
The shield circuit shown in the figure has elements to obtain the maximum gain with the maximum...