Two people (or two teams) can use the quiz buzzer to show who pressed their button first. When the button is pressed the buzzer sounds and either the red or green light is illuminated to show who was fastest.
This project is brilliant for demonstrating a wide range of electronics. It uses push to make & push to break switches, thyristors as latches, transistors, logic gates, LEDs & buzzers.
- Audio and visual indicator.
- Demonstrates a wide range of electronics.
- 1 x Quad 2 Input AND Gate (4081B).
- 1 x Quad 2 Input OR Gate (4071B).
- 2 x IC Socket 14 Pin.
- 2 x Miniature Push to Make Switch, Red.
- 1 x Miniature Push to Break Switch, Black.
- 1 x Red 5mm Diffused LED - 275mCd.
- 1 x Green 5mm Diffused LED - 35mCd.
- 5 x 10K Resistor.
- 2 x 220R Resistor.
- 2 x 2N5061 Thyristor.
- 1 x BC547 NPN Transistor.
- 1 x Piezo Buzzer (with Drive).
- 1 x PP3 Battery Clip Lead (Heavy Duty).
- 1 x 3xAA Battery Cage with Clip.
- 1 x Quiz Buzzer PCB.
- PCB Length: 59.5mm.
- PCB Width: 43mm.
This kit is supplied in a grip seal bag.
Teachers can order a sample of this kit (one per school) here. You will need to select the kit from a list of all the sample kits; the stock code for this kit is 2116.
Note: this service is only offered to schools for evaluation purposes only.
This kit is designed and manufactured in the UK by Kitronik.
- PCB Length: 60mm.
- PCB Width: 43mm.
- PCB Component Count: 19.
- Voltage Nominal: 4.5V.
- Voltage Range: 3V - 6V.
- Standby Current: 0.04mA.
- Current Max at Nominal Voltage: 10mA.
Could the LEDs be replaced with larger bulbs (filament) to make it more obvious to the contestants who has buzzed first?
Posted byon Tuesday, 10 January 2017
Hello Chris, The easiest way to do this might be to replace the original LED’s with high brightness LED, and then encase these in a small transparent enclosure. This should make it more obvious who has buzzed first. You should even be able to place the LED’s that come with the kit in an enclosure to make it more obvious.
Can you join two kits together to facilitate 4 teams? i.e. retain the functionality of being clear who buzzed first. If so, what would you need to do / buy extra beyond the two kits to facilitate please?
Posted byon Wednesday, 1 October 2014Unfortunately it would take a different circuit to do that. There's not a simple way to connect two of these kits together to achieve what you're after.
I am not sure if this is possible but instead of two contestant switches could i connect two sensors (LDRs). These would be permanantly lit (shorted) and go open when the light was interupted. I only ask as I noticed you sell light / dark switches.
Posted byon Wednesday, 2 July 2014Put the LDRs into where R1 and R5 are marked on the PCB Put the two resistors R1 and R5 into the slots where the switches should go. You might need to experiment with the values of R1 and R5 the resistors to get the sensitivity you require.
Is it possible to strip the kits of solder and reuse them? I would like to be able to do this with a large number of students but could not afford to buy new kits every year.
Posted byon Tuesday, 24 June 2014You can with solder mop and solder suckers if you are careful. Each time you do this though you risk taking a pad off the board and each time the PCB will get messier. If you are really careful and have a lot of experience you might damage 1 in 10 kits. If you haven't done much soldering before you might damage 1 in 3 or more. You can probably re-use some kits this way but i wouldn't say the kits are re-usable as they weren't designed with that in mind.
Another question - is there a limit on the distance between push buttons and the PCB? I want to have about 10 feat of wire, to allow a University Challenge type match - two teams on opposite tables, with the quiz master in the middle. I would be using shielded audio type cable.
Posted byon Wednesday, 27 March 2013The maximum allowable length of cable would depend on the resistance of the cable. If you have a data sheet for the cable you are using I could work it out for you. That said, 10 feet should be fine for most cable types.
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