Light and music installation on triacs. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Light and music installation on triacs. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands

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Triacs are symmetrical trinistors that operate with any polarity of the voltage at the anode. They are used in household dimmers SRP-0,2-1.

Installation - three-channel. The audio frequency signal is fed to its input through a step-up transformer T1, which also acts as a decoupling element between the output of the amplifier 34 and the lighting network. The installation uses the simplest frequency crossover filters R2C1, R4C2 and R6C3 .. Trimmer resistors R1, R3 and R5 - channel sensitivity controls.

(click to enlarge)

The set-top box uses fixed MLT resistors, paper capacitors for a nominal voltage of 600 V and an output transformer from the Record-305 tube receiver (it can be from any other similar receiver of the second - fourth classes).

When mounting, triacs V1-V3 must be installed on heat sinks with dimensions of 50 x 150 mm made of sheet duralumin or brass with a thickness of 3 ... 4 mm. For safety reasons, heat sinks with triacs and all other parts of the installation must be mounted on an insulating base and placed in a case of the same material. When used as trimming variable resistors with metal axes, pieces of a PVC tube must be put on the latter.

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Operating temperature -40° ... 85°C.

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