Light and music installation Samotsvet-128. Encyclopedia of radio electronics and electrical engineering

Encyclopedia of radio electronics and electrical engineering / Color and music installations, garlands

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"Gem 128" (Fig. 1) has 128 different illumination programs, each of 128 is repeated twice.

(click to enlarge)

The total cycle time is about 5 minutes. After this time, the programs are repeated from the beginning. The number of garlands is 4. They are made of standard incandescent lamps (13,5 V x 0,15 A). The connection diagram of the garlands is shown in Fig. 2.

All four garlands are connected to the block via tape recorder 5-pin connectors. The use of such connectors is very convenient: all garlands are connected separately and do not get confused during storage. They can be hung on a Christmas tree with beams converging at the top (Fig. 3).

The connection scheme of 16 lamps in four garlands allows the inclusion of one, two and simultaneously all lamps in various combinations in dynamic mode. This mode ensures the simultaneous flow of current through no more than 8 lamps, so the total current consumption for all 16 lamps is not more than 1,2 A. Alternate, fast for the eyes, imperceptible switching "draws" 128 different dynamic figures. It is impossible to list their combinations, it is better to see once!

To eliminate parasitic illumination in the garlands, 16 diodes of the D226 type were used, which are mounted vertically on the printed circuit board (Fig. 4). The "dynamics" of the garlands is provided by two transistors (VT3, VT4), controlled by open-collector inverters, and this is the K155LA8 microcircuit, in which two elements remain free.

Please note that an unstabilized voltage of 3 V is supplied to the collectors VT4, VT15. The rectifier should provide a current of up to 2 A. The author used TVK110 with Uout \u12d 1 V and I out \u202d 142 A as a power transformer. It turned out to be quite enough. The rectifier diodes (KD5 type) are located on the radiators in the same way as the KR5EN16A integral stabilizer with an output voltage of 307 V, which supplies the unit's microcircuits and a control display made up of XNUMX ALXNUMX multi-colored LEDs.

The LED matrix circuit board is shown in Figure 5.

The installation step is 10 mm, the LEDs are connected directly to each other by leads. Panel thickness for LEDs 5...7 mm. This will protect the device from overheating. Be careful when soldering LEDs. Do not "swing" them until the soldered conclusions have completely cooled down!

The control display and garlands repeat the program written to ROM DD4: the active level for D0-D7 is low. The addresses of the memory cells are "selected" by the counter DD2 (K561IE16) at a rate of 8 bytes / s, and the switching of "dynamic" keys at a frequency of 64 Hz. It is at this frequency that the clock generator, implemented on two DD1 elements of the K155LA3 type, operates.

A few words about the pinout of the AL307 LEDs (Fig. 6). For "red" the anode terminal is wider than the cathode, while for "green" and "yellow" - the opposite is true.

"Gem-128" for disco

The schematic diagram is shown in Fig.7.

(click to enlarge)

For the correct operation of the program, the AO input of one MS memory is grounded, and the other one is connected to +5 V. The keys use 16 KT315B transistors and 16 KU202N thyristors. Between the outputs of the ROM and thyristors (instead of KT315) it is more convenient to put inverters of the K1555LN1 type (3 pcs.).

Author: A. P. Simutin

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