Automatic lighting effects on PROM. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Automatic lighting effects on PROM. 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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In the diagram in Fig. 1, a variant of the automaton of light effects on a PROM chip is proposed. These microcircuits allow you to implement several modes of operation in the machine without external adjustments and switches.

Fig.1 (click to enlarge)

This automaton of lighting effects implements 16 options for switching garlands, in addition, automatic enumeration of programs for switching garlands in three modes is provided.

1st mode (main) - sequential enumeration of all programs, each program is repeated 64 times.

2nd mode - continuous repetition of one combination of lighting garlands.

3rd mode - all light sources are constantly on.

The circuit is assembled on five microcircuits and is powered by a stabilized source of +5 V. The basis of the circuit is a one-time programmable K556RT4 microcircuit, which can be programmed independently using a simple programmer (Fig. 2).

Fig.2 (click to enlarge)

From a clock generator assembled on a DD1 chip (K555LA3). clock pulses are received at the input of the counter DD2 (K555IE7). The outputs of the counter are connected to the address inputs of the PROM. Thus, the DD2 counter provides sequential access to sixteen PROM memory cells that set light combinations for one program. With the help of the counter DD3, each program is repeated 64 times.

In the mode of automatic enumeration of programs (the first mode, SA1 in position "1"), pulses are received at the counting input DD3 from the transfer output of the counter DD2. If the switch SA2 is in the "S" position, the pulses from the output of the counter DD3 are fed to the input of the DD4 chip. in this case, the program switches after 64 repetitions of it. In the event that SA2 is in the "R" position. then the program switch occurs without repeated repetition.

If the switch SA1 is moved to position "2", the counter DD4 stops receiving program switching pulses and the machine implements the program that was initialized at the time the switch was set.

In position "3" of switch SA3, a logical unit is formed at the outputs of DD5 and lamps HL1-HL4 are lit (regardless of the position of SA1).

Powerful triacs are used as power switches, which makes it possible to do without a power rectifier bridge and connect a sufficiently large load to the channel (up to 2 kW when using cooling radiators).

The programming of the K556RT4 PROM chip can be done using a simple programmer according to the firmware map presented in Table 1 (only four programs are given in the table, the rest are flashed at the discretion of the user). The scheme of the programmer is shown in Fig.2.

(click to enlarge)

In a "clean" K556RT4 chip, all cells contain zeros. Programming comes down to writing units to the desired digits of the desired cells. This is done in the following way. Using the switches SI-S8, the address of the cell to be programmed is set, and the switch S10 is the digit in which the unit should be written. Then press the button S9. In this case, the pulse from the output of the element DD1.4 opens the key VT1, in the collector circuit of which the relay P1 is connected. The relay contacts supply a voltage of 12 V to the programmable discharge. If the unit is written correctly, the HL1 LED lights up. If the recording fails, it is necessary to increase the burn voltage to 13...15 V.

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