This control for 1/15 HP motors with 5,000 rpm for 115 V power grid was suggested by a Motorola circuit manual from 1968. The SCR supports more modern equivalents.
With this circuit it is possible to use a common hair dryer as a hand dryer. The circuit is timed...
This circuit was obtained from an English magazine from 1979, but can be easily assembled today...
This circuit was obtained in a 1975 magazine, but it can be easily assembled using BC548...