With the circuit shown, when the brightness of one lamp decreases, that of the other increases. There is a transfer of brightness, in a special effect. The circuit is from a thyristor manual from 1974 but can be assembled with Triacs of the ICT series and common diacs. The lamps must be incandescent with maximum power according to the triac used. With component changes, the circuit also works on the 220 V power grid.
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