We found this circuit in an Electronic Design. The main integrated circuit is the 4017. The frequencies are determined by the RC circuits as well as the duration of the generated pulse train.
This circuit is from 1995 documentation. The power depends on the transformer, which in this case...
This circuit was found in a Popular Electronics of the 1980s. The microammeter may be the lowest...
September 2017 - Littelfuse's Polyswitch SMD Resettable PTCs can now be purchased from Mouser...