The thyristor three-tone light circuit is shown in the figure. It can control the red, green and blue light bulbs with only one potentiometer. VT1 ~ VT3 can be used BT169D, 2N6565, MCR100-8 small Plastic sealed unidirectional thyristor, E1 ~ E3 can be used according to personal preference, respectively, red, green, blue and other colored incandescent bulbs with power not exceeding 60W.
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