Projects in the October 2000 issue of EPE Magazine | |
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![]() Check that your Moodloop (Sept. 00 issue), and find the sources of 50Hz mains fields from mains powered-equipment using this simple design. LED bargraph indication. Uses AD8532 dual op-amp and LM3914. |
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![]() An occasional spin of the winder is all that's needed to power up our pocket-size torch. Our design uses a stepper motor as a dynamo, and Goldcap 1Farad capacitors as an energy reservoir, to illuminate a super-bright white l.e.d.. Helped by a lens, the torch offers 15 minutes of light for walking, or 90 minutes for reading. Batteries not included or needed! |
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![]() A simple project, ideal for novices, this self-contained alarm unit rests in your freezer compartment or fridge and warns of increasing temperatures. Ideal to help monitor frozen goods during power cuts, or perhaps you've left the door open! Uses the TC622 single trip-point temperature sensor chip for simplicity of construction. |
Also in the October 2000 issue: Interface looks at digital and analogue temperature interface for your PC; New Technology Update outlines new processor developments proposed by IBM; Circuit Surgery tests transistors the easy way. |
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