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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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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Simple Light Actuated Relay by Phototransistor

Thursday, May 1st, 2008
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The Sun - Up Relay Switch can be used to provide a audible switch for when the sun comes up. It can also be used to detect a light beam, headlights etc.
This circuit is easy because it used one Transistor 2N2222-2SC945-2SC828-BC549 etc , Relay and Pototransistor Only. The important part of the circuit is [...]