Light accompanies. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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Light and music installations are very popular among young people. A scheme for another version of such a device was proposed by the magazine "Radio, Television, Electronics" (NRB). It consists of three color channels (red, yellow, blue) with crossover frequencies: 700 Hz - 3,5 kHz -13,5 kHz.
The design is greatly simplified due to the use of four blocks of the same type. The "stuffing" of each block consists of two transistors and three resistors.
(click to enlarge)
As an input isolating transformer T1, a transitional transformer TP12 from the radio receivers "Speedola", VEF-12, etc. can serve. The signal is applied to one half of the secondary winding, and removed from the primary.
The maximum power of lighting lamps is 1 kW, so SCRs must be installed on radiators. SMU is configured with variable resistors R5-R7.
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