Light and music installation Svetlana. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Light and music installation Svetlana. 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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Light and music installation "Svetlana" consists of six functional blocks: amplifier, color analyzer, power supply, multivibrators, "pause" and FOU (Fig. 1).

Light and music installation Svetlana. Device block diagram

The color analyzer is based on the scheme from the collection "To Help the Radio Amateur" No. 42, a number of changes and additions have been made to it. For example, the 4th channel "pause" is on. In the absence of a signal, the thyristor V4 (Fig. 2) is open and the lamps H25.1-H32.1, H25.2-H32.2 are on. As soon as sound vibrations appear, V4 closes and the thyristors V1-V3 control the HEU lamps (H1.1-H24.1, H1.2-H24.2).

Light and music installation Svetlana. Schematic diagram of the installation Svetlana

For normal operation of thyristors, the input signal must be at least 2,5 V. Therefore, an amplifier is included in the Svetlana circuit diagram, thanks to which the light and music installation is connected to various sound-reproducing electronic devices (electrophone, tape recorder, radio receiver).

If the sound signal is strong enough, the amplifier is turned off by switch S7 and the electrical vibrations are sent directly to the color analyzer. The input voltage level is set using a variable resistor R14 (control is carried out using the PA1 measuring device).

The power supply is made according to the bridge circuit. To smooth out the ripple of the rectified voltage, a conventional LC filter is used.

Multivibrators are designed to create various color effects on the screens of a light and music installation. The required modes of operation are set using switches S1-S9. The flash frequency is set by variable resistors R19, R24.

The output optical device consists of two identical light columns measuring 265 x 265 x 235 mm. The total power of the lamps of one column is 100 watts. The color block is mounted on a printed circuit board measuring 155X X65 X 1,5 mm (Fig. 3), VI-V4 thyristors are installed directly on the board, but with a load of more than 100 W per channel, they need to be installed on radiators - copper plates 6 - 10 cm in size² 2 mm thick. Inductors L1 - L4 are glued with PVA or BF-6 glue.

Transformers T1 and T2 are wound on cores Ш 12x25 and contain:

T1: I winding - 2380 turns of PEL wire 0,12; II - 2 x 140 turns of PEL 0,2; III - 65 turns of PEL 0,25;
T2: I-180 turns PEL 0,25, II- 360 turns PEL 0,25.
Inductors L1-L4 are wound on a cardboard frame (Fig. 4) and have a 600НН grade ferrite core (L=20 mm, dia. 0,8 mm). L1 and L2 contain 1600 turns each, L3-2000 turns, L4-3000 turns of PEL wire 0,08.

Light and music installation Svetlana. Choke winding frame

The amplifier is assembled on a printed circuit board measuring 110x52x1,5 mm (Fig. 5). Output transistors V40, V41 are mounted on copper or aluminum U-shaped radiators 25x38x25mm in size (Fig. 6). Multivibrators are mounted on two printed circuit boards measuring 70x50x1,5 mm (Fig. 7). The relays K1, K2 installed on them emit characteristic clicks. Therefore, they are pasted over on all sides with foam rubber 10 mm thick. The "pause" block is assembled on a printed circuit board measuring 74x50x1,5 mm (Fig. 8). In a rectangular cutout measuring 47x27 mm, a tuning resistor R5 is fixed with an aluminum strip bandage. The power supply is made by the method of surface mounting. The T3 transformer is wound on a Sh16x25 core. Winding I- 2380 turns of wire PEL 0,12; II - 65 + 100 turns of PEL 0,2; III - 65 + 65 turns of PEL 0,2. The L5 filter inductor has 450 turns of PEL 0,15 wires wound on a Sh12x20 core.

The location of the circuit elements and circuit boards on the common chassis of the light and music device is shown in figure 9. Light columns are made of 8 mm plywood, fastened with screws and wood glue (Fig. 10). The inner surface of the speakers is pasted over with crumpled aluminum food foil or mirror fragments. The screen consists of two mutually perpendicular rows of glass tubes dia. 4-7 mm. The vertical row is held by beads 3-4 mm high, the horizontal row is held by longitudinal tin flanges.

Author: V. Busel; Publication: cxem.net

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Comments on the article:

Vadya I
I don’t know, maybe I’ve gone crazy, but since childhood, Svetlana’s color music scheme looked different. For smooth operation of light bulbs, in the circuit, as in a receiver with a local oscillator, there was a generator circuit for kilohertz 30-40. Each of the 4 ferrite rings received a signal from the low-pass and high-frequency filters. High-frequency pulses modulated by a low frequency caused the thyristors to smoothly light up the light bulbs. Where in the sum of four colors there was always a different pattern on a matte screen. [roll]

Yuri T
My first CMU, which immediately started working.

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