This Philips circuit of the 70's makes use of components of the time. The DZD40 is an uncommon integrated circuit today.
The transistors of this old circuit from the 60s can be the BC548, in a current version. The...
This electronic soldering gun circuit was found in the December 1998 Electronics Now magazine. The article...
This circuit was found in an American documentation from the 90's. What it does is provide at the...