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.
The original document is from Philiups, but now available from NXP (www.nxp.com), which is the...
The figure shows how to drive a load up to 300 mA with an LM3900. The transistor can be a BD136. We...
This dimmer or light control for incandescent light bulbs or even small heaters, is one of many...