This circuit was obtained in a magazine for radio amateurs 73 of the 90s. The circuit is based on the XR2206, which is not a component found easily today.
This thermostat was found in a 1997 publication. It can be powered by 6 V with the use of a...
This switched-mode circuit was found in the April 1976 issue of Radio Electronics magazine. The...
This circuit was obtained from an old American publication. Transistors are germanium types of the...