rotating flashing 230v lights

Posted on Feb 7, 2014

The 15V dc supply is obtained from a nominal 230/24V center tapped ac transformer (T1) and a full wave rectifier (D5 & D6): Zener diode D4 was added to clamp the dc voltage to 15V maximum. Triacs D7, D8 and D9 are insulated from the control circuitry by means of Optoisolators IC2, IC3 and IC4. IC1A, B and C are wired as monostables and cascaded in

rotating flashing 230v lights
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order to obtain a rotating sequence when the Mode switch SW1 is set in the Rotate position. IC1D acts as an astable multivibrator and generates an adjustable flashlight, driving all three lamp strings at the same time when the Mode switch SW1 is set in the Flash position. Each channel can drive several 230V lamps wired in parallel for each string, provided the maximum current of the Triacs is not exceeded. For example, each channel will be able to drive up to 20 40W bulbs. The circuit is also well suited for many small bulbs wired in series like the usual Christmas tree lamp strings decorations. As these are very low power devices, a lot of them can be driven by this circuit. The more lamps per string are used, the more satisfactory will be the resulting effect. The Trimmers R1, R2 and R3 should be adjusted to obtain equal delay times or until a pleasing visual result is obtained when observed from some distance. In any case, the Trimmers can be substituted by three fixed 1/4W resistors of equal value: 100K, 220K or 470K will work fine.

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