The simplest 3-channel color and music setup. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The simplest 3-channel color and music setup. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Color and music settings

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The figure shows a diagram of the most primitive color and music setup for three channels. This DMU includes the simplest passive filters on RC elements, the output signals of which control thyristor switches. The emitters are powered by a constant voltage source of 220 V.

The simplest 3-channel color and music setup

The top one in the diagram is a low-pass filter, tuned to a frequency of 100 ... 200 Hz, below the diagram there is a band-pass filter MF (200 ... 6000 Hz), and below - a high-pass filter (6000 ... 7000 Hz). The LF, MF and HF channels correspond to red, green and blue lamps. Since this circuit does not contain a pre-amplifier, the input signal must have an amplitude of 0,8 ... 2 V. The signal level is regulated using resistor R1. Resistors R2, R3. R4 are designed to control signal levels for each channel separately.

Transformer TP1 is made on the core Ш16х24 from transformer steel. Winding I contains 60 turns of PEL 0,51 wire. winding II - 100 turns of PEL 0,51. Any other small-sized transformer (for example, from transistor receivers) with a ratio of turns in the windings close to 1:2 can also be used. Thyristors must be installed on heat sinks if the total lamp power per channel exceeds 200 W.

The presented 3-channel DMU is very easy to manufacture, but it has many disadvantages. This is, firstly, a large required input signal level, secondly, a low input impedance, and thirdly, a sharp flashing of the lamps caused by the lack of compression and the primitivism of the applied filters.

Publication: cxem.net

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