Color and music installation using active filters on transistors. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Color and music installation using active filters on transistors. 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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Figure 1 shows a DMU circuit using active filters on transistors. With the help of such filters, it is possible to achieve a better frequency separation of the channels and a "soft" switching on of the lamps. In addition, the required input level is reduced.

Color and music installation using active filters on transistors

Setting up the set-top box begins with checking the supply voltages. The amplitude of the signal on the output windings of the transformer TP1 should be about 2V.

Then configure the channel filters. To do this, it is best to use a low-frequency generator, which is connected to the input of the circuit. Start with a low-pass filter (upper in the diagram). Resistor R1 is set to the position corresponding to the minimum signal attenuation, then the filter bandwidth is adjusted with a tuning resistor R8 to ensure the maximum glow of the lamp of this channel when the low-frequency signal generator with frequencies of 100 ... 800 Hz is supplied from the generator. The rest of the filters are set up similarly (1000...6000 Hz, 6000...10000 Hz).

When operating the device for various types of input signals, it is necessary to adjust the signal levels in the channels with resistors R1, R2, R3. This allows you to compensate for the uneven frequency response of the signal and ensure the same brightness of the lamps for all channels.

Transformer TP1 is made on the magnetic circuit Ш 10x10 from transformer steel. Winding I contains 200 turns of PEL 0,2 wire, winding II - 400 turns of PEL 0.2. Transformer windings are carefully insulated with varnished cloth. Instead of TP1, you can use an optocoupler.

Instead of triacs KU208, thyristors KU202 can be used. but this requires a rectifier bridge in the lamp supply circuit.

Lamp power can be increased up to 2 kW per channel. In the case of an increase in the fashionability of lamps per channel up to 200 W or more, power elements (thyristors or snmistors) must be installed on heat-removing radiators.

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