Backup Lamp light fails by Vmos

Wednesday, June 25th, 2008

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There are a few situations when a power failure is particularly difficult to handle. Some of
these circumstances occur in the bathroom. This little circuit will pay for itself many times
over the first time it is used, especially if you are in the shower.
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Light Actuated Switch KIT

Friday, June 20th, 2008

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This is small electronics kit Light Actuated Switch KIT.
It is automatically turn something on at night time and back off at dawn. A heavy duty relay provides NO and NC contacts rated at 5A at 24V. IC LM324 design delay circuit avoids cycling on/off at marginal thresholds. Wide range sensitivity adjustment matches any [...]

Dark-Detecting LED

Thursday, May 29th, 2008

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Here’s a simple problem: “How do you make an LED turn on when it gets dark?” You might call it the “nightlight problem,” but the same sort of question comes up in a lot of familiar situations– emergency lights, street lights, silly computer keyboard backlights, and the list goes on.
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