This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be assembled easily, since all the components are common. The circuit activates and locks the lamp corresponding to the player who presses his switch in the first place, inhibiting the activation of the other. The circuit can be powered with 9 V for 6 V lamps as there is a voltage drop in the SCR.or 12 V for 12 V lamps.
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