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THE THYRISTOR - BREADBOARD CIRCUIT
V. Ryan © 2005

A Steady Hand Game is shown below. The aim is to move the handle around the wire shape without touching it. If the handle touches the wire a buzzer sounds. This is the type of game that contains a thyristor circuit. When the handle touches the wire the buzzer will sound until the reset push switch is pressed, even if the handle is moved away from the wire.

The circuit for this type of game is shown below. The main component is called a thyristor. This is a special type of switch. When it is activated it cannot be turned off unless electrical power is removed from the whole circuit.

The symbol that represents the thyristor is shown opposite. It has three pins. The ANODE, CATHODE and GATE.

1. Using circuit simulation software draw the thyristor circuit.
2. Close switch 'A' to supply power to the whole circuit.
3. Close switch 'B' to allow current flow into the thyristor's gate.
The buzzer should sound.
4. Open switch 'B' - the buzzer should still sound because the thyristor cannot be deactivated until all power to the circuit is removed.

5. Construct the thyristor circuit using a breadboard and the components listed below. Be careful to line up the components accurately. The black dots show the position of wires and components.

COMPONENTS

Three 1K resistors.
One thyristor.
One 6 volt buzzer.
One battery snap.
One 9 volt battery.
Red and Black wire.

When the battery is connected power is supplied to the circuit. Touching the red and black wires for a split second activates the thyristor which allows the buzzer to sound. The buzzer will continue to sound even though the red and black wires are not touching. The 'buzzing' can only be stopped if the battery is removed.

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CLICK HERE FOR INDEX PAGE THE THYRISTOR - BREADBOARD CIRCUIT V. Ryan © 2005 A Steady Hand Game is shown below. The aim is to move the handle around the wire shape without touching it. If the handle touches the wire a buzzer sounds. This is the type of game that contains a thyristor circuit.

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Introduction: Your Own Operation Board Game

The board game "Operation" is based on a very simple circuit, so you can build your own and customize it really easily!

Step 1: Intro and Materials

I first made this game when I was around 11 or 12, when I was on some rant about how the original Operation dude didn't wear any underpants. I told my mom she shouldn't let my younger brother play the game because it was inappropriate (I didn't actually believe this, though, I just liked arguing about things back then). So...I made my own (with boxers drawn on) and called it "Disease Remover". it's a very simple game to make, and it would make a really funny gift or practice for people who want to learn more about electronics.

Materials:

Wire and wire strippers
Shoebox Lid
Metal Tweezers
LED
Small Buzzer
2 AA Batteries and a holder
Drinking Straws
A small bit of spare cardboard

Step 2: Yep, That's All It Is: the Circuit

There is one loop in this circuit, and it makes a complete circuit when your hand starts to get shaky and you let the tweezers touch the metal sides.

There isn't much to explain on this step; just make sure you connect everything with the right polarity as shown in the diagram.

There is gonna be a whole lot of wire hanging off of the negative end of the LED. This wire will make loops around the holes in your board, acting as the "metal sides" like on the real gameboard. Yes, this means you have to do a lot of wire stripping :c)

Step 3: Getting the Board Ready for Wiring

Essentially, the shoebox lid is going to be your gameboard and you will have to come up with a picture to put on the top. As you can see in my picture, I just drew a guy that looked like the original Operation man. You could do anything from putting a picture of your friend to putting a random picture of an animal you would like to "dissect" on there.
One idea I had was to make it a picture of a human heart and then have the player remove pieces of cholesterol from the arteries. Whatever you like.

Tape or glue the picture on the shoebox lid, and trace out the places where you would like to "remove" things from the board. Also trace a place for the speaker and LED to stick out from.
CAREFULLY Cut out these pieces using a knife.

Since most of us don't have a machine to make nice little breadboxes and wrenches and broken hearts and other various things that the original Operation had us remove, we are going to use cut up pieces of drinking straw.
They should be a little shorter than the length of your cut-out holes.

Step 4: Wire It Up!

If you haven't done so already, build the circuit in the diagram on Step 2.

There should be a lot of excess wire hanging off of the negative side of the LED. Strip all of it; enough to wrap around all of the holes in the bottom of your board. This exposed wire will act as the "metal sides" that players will try not to touch.

Using the spare pieces of cardboard, we can make holders for these pieces of straw.
Bend the pieces of cardboard, as shown in the picture, and superglue or tape them to the bottom side of your shoebox lid, over the holes.

Step 5: Finish

Tape whatever of the exposed wire that you didn't use to the bottom of the board, and make sure it isn't touching any other wires.

Attach a wire to the pair of tweezers using tape, glue, or solder. Poke a small hole in the top corner of your board and thread the end of this wire underneath. Connect it to the negative lead of the battery, and you should be in business! Touch the tweezers to the metal sides of the holes and the light should light up and the buzzer should ring. If not, you might want to check your connections and make sure everything is connected in the correct direction.

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Please be positive and constructive.

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The board game "Operation" is based on a very simple circuit, so you can build your own and customize it really easily! I first made this game when I was around 11 or 12, when I was on some rant about how the original Operation dude didn't wear any underpants.

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Search GCSE Science Browse Topics: Chemistry Revision Quizzes Chemistry Revision Questions Physics Revision Questions Physics Revision Quizzes About GCSE: The General Certificate of Secondary Education (GCSE) is an academically rigorous, internationally recognized qualification (by Commonwealth countries with education systems similar or identical to the UK education system) awarded in a specified subject, generally taken in a number of subjects by pupils in secondary education in England and Wales over two years (three years in certain schools).