MARBLE RUN

ABOUT THE GAME

MARBLE RUN is a collaborative attempt to build
the longest marble run on earth! There are different
types of bricks available to build tracks with.

Every user-built track that is added to the marble
run increases the total length of the over all track.
With increasing length more and more special bricks
get unlocked to allow you to build even more tracks!

MOZILLA GAME ON 2010

This game was developed by students of the Salzburg University of Applied Science for the Game On 2010 challenge hosted by Mozilla.

CREATED BY

Elektor Electronics 302 Circuits Pdf 14 [verified] «FRESH · 2026»

Duration: 3 hours Total marks: 100

Section D — Troubleshooting and modification (20 marks) 14. (8 marks) You assemble a DC motor speed controller from the collection but find the motor judders and supply voltage drops under modest load. Provide a step-by-step troubleshooting checklist (8 key tests or checks), explain what each test reveals, and recommend likely component-level fixes. 15. (6 marks) A published audio amplifier produces audible hum at 50/60 Hz. List five probable causes and for each give one corrective action. 16. (6 marks) You want to adapt a circuit that uses an obsolete IC specified at ±12 V to work from a single 12 V supply with minimal redesign. Outline a practical approach (6 concise steps) including level shifting, virtual rails, or selecting modern equivalents. Elektor Electronics 302 Circuits Pdf 14

Section C — Design and application (30 marks) 10. (10 marks) Design a compact, battery-powered LED flasher (approx 1 Hz) based on a circuit concept from “302 Circuits”. Requirements: runs from a single 3.7 V Li-ion cell, drives a white LED (forward voltage 3.0 V) at 20 mA with suitable current-limited pulsed drive, uses minimal parts, includes a schematic and component list with values, and explains how you ensure safe battery discharge and LED current limiting. (Include a short PCB/component placement note.) 11. (8 marks) Modify a published tone-generator circuit (astable op-amp or NE555) to produce an adjustable square-to-sine-like audio output from 400 Hz to 4 kHz with amplitude suitable for feeding into a small power amp (line-level). Provide a block diagram, component choices, and explain how tone and waveform shaping are achieved. 12. (6 marks) Propose an EMI mitigation plan for a switching power-supply circuit found in the collection: list five practical measures (e.g., snubbers, layout changes, filtering) and briefly explain the purpose of each. 13. (6 marks) Select one project-type from the book (e.g., FM transmitter, logic trainer, measurement accessory). Describe enhancements to improve reliability and usability: three hardware changes and two documentation/user-interface improvements. Duration: 3 hours Total marks: 100 Section D

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