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Game Show Indicator Lights (Who's First) - This circuit turns on
a light corresponding to the first of several buttons pressed in a "Who's
First" game. Three stages are shown but the circuit can be extended to
include any number of buttons and lamps. Three SCRs (silicon controlled
rectifiers) are connected with a common cathode resistor (50 ohm)....
Game Show Who's First Indicator Lights - The circuit above turns
on a light corresponding to the first of several buttons pressed in a
"Who's First" game. Three stages are shown but the circuit can be extended
to include any number of buttons and lamps. Three SCRs (silicon controlled
rectifiers) are connected with a common cathode resistor (50 ohm) so that
when any SCR conducts,.....(circuit / schematic design added 6/06)
Garage Light Indicator LED - This is the simplest possible way
to power an LED off 115VAC. I epoxied a high-brightness yellow LED
into the switch plate to my garage light. The light switch is inside my
house, but the garage light cannot be seen when the door is closed.
This has caused me to leave the garage light on overnight many times until
I created this solution. I have outdoor lights.....Designed by Andrew R.
Morris (added 09/05)
High DC Current Indicator - A while back, someone requested a simple method
to indicate when 20 to 50 amps of DC current was flowing through a wire. The circuit
below works well and is about as simple as you can get. A sensitive reed relay… ….
[Hobby Corner Circuit by Dave Johnson]
Hot Water Tank Indicator - The idea for this project may have come to me in
a flash of inspiration, and its a very simple way to check if a fuse has blown without
removing it from its holder….(schematic / Circuit design added 9/02)
