Musical play of light. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Musical play of light. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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A fairly simple and reliable circuit, which includes a two-transistor multivibrator and a pair of thyristors controlled by it, enjoys well-deserved recognition and popularity among radio amateurs. It allows you to alternately switch four incandescent lamps or garlands to obtain the effect of "running lights".

Musical play of light

The switching frequency is controlled by a variable resistor with a maximum resistance of 22 kOhm. However, the capabilities of this circuit design can be expanded by increasing the value of the "variable" to 220 kOhm. In particular, by simply moving the slider of such a resistor, it is possible to obtain, for example, an additional effect of "mysterious" flickering of lamps.

Schematic diagram, printed circuit board topology and general view of a home-made color and music device for a disco (click to enlarge)

The inclusion of lamps to music also has an impressive effect on those present, which is easily achieved by introducing the simplest single-transistor modulator into the circuit diagram. Moreover, with the coloring of the lamps in different colors or when using contrastingly colored shades (light filters), the old "flashing light" acquires the properties of the original color and music device. The control is automatic, from a kind of "microphone", which can be used as an ordinary broadcast loudspeaker connected to the base of the modulator transistor through an electrolytic capacitor with a capacity of 5 microfarads.

When you install such a speaker-"microphone" near the sound source (tape recorder, radio, speakers), quite interesting effects are obtained. In particular, with the appearance of sound vibrations in the air, the diffuser and the coil of the magnetodynamic system rigidly connected to it come into motion, in the coils of which an EMF is induced. The resulting electrical signal steps down - through the transformer T1 (a matching element loaded on the potentiometer R8) and capacitor C6 - to the base of the transistor VT3, amplified and modulates the operation of the multivibrator, resulting in continuous switching of the lamps to the rhythm of the music.

The advantage of the circuit solution modified by me in comparison with the previous one is the absence of a direct wired connection between the sound source and the light and music installation. In addition, there is a real possibility of arranging a mobile disco that can work equally well both at home and on stage, with the installation of a speaker-"microphone" without an additional amplifier near musical instruments.

The device is mounted on a printed circuit board with dimensions of 145x70x1,5 mm from one-sided foiled getinax or textolite. Widespread and inexpensive MLTs are used as fixed resistors. "Variable" R5 - type SP-1.

Capacitors C1-C4 can be of any type with ratings corresponding to those indicated on the circuit diagram. But capacitive - electrolytic, designed to work in circuits with an operating voltage of 16 V (C5) and 25 V (C6).

Instead of KT3107J transistors, KT361 or even MP39-MP42 with any letter index at the end of the name are applicable. Replacement of thyristors is also acceptable (KU201 and KU202 with indices from K to H are equally acceptable). As valves VD1 - VD4, VD8-VD11, KD226V and their equally powerful counterparts are suitable. Diodes VD5 and VD6 are well-known D9, and D7 can successfully act as a zener diode VD814. Electric lamps EL1-EL41 must be designed for an operating voltage of 220 V. The power of each of them is 25-100 watts.

Loudspeaker-"microphone" it is better to use a translational one (in combination with a transformer and a potentiometer) with a power of 1-3 watts. A design in the form of a block in a separate housing is also acceptable, including a one-three-watt dynamic head (preferably with a large diffuser), an output transformer TVZ or TVK and a variable resistor from 33 to 82 kOhm.

The very same light and music device can be made in the form of a box, on the front panel of which the lampshades of electric lamps are displayed, and on the side wall - a knob for setting the switching frequency and a socket for connecting a loudspeaker - "microphone".

Author: M.Povalyaev

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