This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.
This circuit was fond in an old publication of the years 1950. The transistors are germanium types and...
The IC used in this project is not common these days, but if you have one you can build a high...
September 2017 - Littelfuse's Polyswitch SMD Resettable PTCs can now be purchased from Mouser...