Prototype game-show win-indicator
A breadboard prototype of a little circuit that will light a lamp to show who hit the button first in a quiz game. It's basically one thyristor (SCR) and one transistor per contestant. The arrangement of the inter-wiring of the button/lamp boxes determines the team(s). With the random thyristors that I found in the junkbox, there's a problem with holding current, which means that the circuit is only fully reliable with incandescent lamps, not LEDs. I'm planning to use 12V 5W car bulbs for the final version.
Prototype game-show win-indicator
A breadboard prototype of a little circuit that will light a lamp to show who hit the button first in a quiz game. It's basically one thyristor (SCR) and one transistor per contestant. The arrangement of the inter-wiring of the button/lamp boxes determines the team(s). With the random thyristors that I found in the junkbox, there's a problem with holding current, which means that the circuit is only fully reliable with incandescent lamps, not LEDs. I'm planning to use 12V 5W car bulbs for the final version.