13-11-2012, 12:34 PM
Quiz project
quiz project.docx (Size: 29.53 KB / Downloads: 30)
Abstract
This project can be used for a quiz with up to 4 contestants (or teams). Each contestant has a trigger push-switch and LED. When a trigger switch is pressed it lights the corresponding LED, sounds the bleeper and prevents the other trigger switches from working - therefore showing which contestant was the first to press their switch. A reset push-switch (operated by the quizmaster) cancels the bleeper and switches off the LED so the circuit is ready for the next question.
Parts Required
• resistors: 470 ×4, 1k ×2, 10k ×8
• capacitors: 0.1µF ×4, 1µF radial
• diodes: 1N4148 ×4
• LEDs: 1 each red, green, yellow and blue, all 5mm diameter
• 555 timer ICs (such as NE555) ×4
• DIL sockets for ICs: 8-pin ×4
• bleeper suitable for 9V
• on/off switch
• push switch ×5
• battery clip for 9V PP3
• 2-core cable such as 'figure 8', about 8 metres
stripboard: 10 rows × 50 holes