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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Who is faster? 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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This slot machine is used not only in the Club game library, but also when holding various events in the city's schools, for example, festivals of technical creativity, scientific and educational games such as the television "Who Wants to Be a Millionaire?" to a question asked by the moderator.

The device is based on a circuit with mutual disconnection of the automation control circuits of other players. There are several options for solving the problem, in particular, using trinistors. However, Pavel Gureev and Kirill Shurygin decided to offer a variant on electromagnetic relays, which can be dismantled in large quantities from decommissioned equipment.

The device consists of the main unit (Fig. 3), in which electromagnetic relays K1-K5 are located, as well as connectors X1-X4 for connecting consoles playing with buttons SB1-SB4 and connector X5 of the host console.

Who quickly?

On the front panel of the unit there are signal lamps of the playing HL1-HL4, the HL5 "False start" lamp (Fig. 4), the HL6 "Victory" lamp, the HL9 lamp (Fig. 5) of the starting signal and the HL7, HL8 lamps of distracting signals (if desired, you can do without without them). A direct current source is used to power the main unit, signal lamp circuits can be powered both with direct current and alternating current, the voltage of which depends on the incandescent lamps used.

Who quickly?

As soon as the leader presses the SB5 "Start" button, relay K5 is activated and becomes self-locking through contacts K5.1, with contacts K5.2 it connects a signal lamp HL6 to one of the conductors of the power source, and with contacts K5.3 it lights the starting lamp HL9.

The task of each player now is to press the button of their remote control faster. If, for example, player number 3 manages to do this, relay K3 is activated, which self-locks with contacts K1.1, contacts K3.2 opens the power circuit of the relay of the rest of the players, and contacts K3.3 turns on the lamps HL3 and HL6. On the panel of the main unit, the backlight of the scoreboard with the player's number and the inscription "Victory" flashes.

If one of the participants accidentally presses the remote control button before the leader's command, the scoreboard of this player and the HL5 lamp will flash, highlighting the inscription "False start".

Lamps HL7, HL8 of distracting signals that complicate the task are controlled by a multivibrator (Fig. 6), the relay Kb of which alternately turns on one lamp after another with contacts K6.1.

Who quickly?

Relays - any with a response voltage of not more than 12 V. So, in one of the copies of the device, the RES22 relay was used, passport RF4.500.131P2. To power them, a transformer was wound on a magnetic circuit Ш16х18. The network winding contained 2800 turns of PEV-1 0,18 wire, the lower winding contained 140 turns of PEV-1 0,25 (a bridge rectifier was connected to it). If the relays turn out to be with a high voltage, you will naturally have to recalculate the transformer data.

To place the parts of the device, a case was used (Fig. 7) from an old electronic-keyboard calculating machine "Electronics-155".

Who quickly?

If, during the verification and adjustment of the device, contact bounce is observed during the operation of the relay, the relay windings should be shunted with oxide capacitors with a capacity of 10-15 microfarads.

Author: Ponomarev L.D., Tula

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