Projects in the November 2000 issue of EPE Magazine | |
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![]() This novel alarm unit is a portable unit which responds to fast changes in light levels (e.g. an intruder's torch/ flashlight), but it cleverly ignores natural dusk-dawn ambient transitions. Exit and entry delays, test function. Battery powered, self contained, siren alarm output. |
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Handclap
Switch Electronics making life easier for you! This sound-activated awitch drives a mains-relay with just a handclap. Electret microphone provides simple toggle on-off control or auto-switch-off function. |
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![]() Part of our series of starter projects that can be build for a tenner ($7), this sample/ hold circuit is an add-on for your digital or analogue multimeter. It samples and holds a changing voltage giving you time to read the display. Stripboard assembly. Requires DG419D single MOSFET transmission gate. |
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![]() A new short series, this month we present a detailed analysis of the Schmitt trigger based on bipolar transistors. Everything you ever wanted to know about Schmitt triggers will be found in this detailed article! |
Also in this issue: Circuit Surgery discusses the theory behind ELCBs (RCDs - GFCIs); Ingenuity Unlimited offers more readers' circuits. New Technology Update - how a new combined dual chipset improves digital imaging. |
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