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Burned bulb detector / switch Answered

Hello to all instructable community, I was trying to find a device that would detect when a bulb is burned and will switch to another lamp. The lamps I am using are 25Watts ac bulbs. I tried to Google a bit, probably didn't search the right keywords, but I couldn't find anything that does what I want. If you got any idea what i am talking about please reply. Thanks to all Omar

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omarharoun
omarharoun

12 years ago

Lets say it would be DC bulbs, do you have another method to do it, with power transistors ?? Omar

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NachoMahma
NachoMahma

12 years ago

. Put a relay coil in parallel with the "main" lamp. Size the coil impedance so that the relay will not energize when the lamp is good. The lamp "shorts out" the relay. When the lamp blows, the relay will energize.

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omarharoun
omarharoun

Reply 12 years ago

Thanks nacho, well actually that was the way i was doing it except that when doing it on a large number , relays becomes expensive, thats why i was thinking if you think there is another way of doing it with simple logic or anything that would be cheap. Thanx Man

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NachoMahma
NachoMahma

Reply 12 years ago

. Unless you have multiple sets of lights in each unit, I don't think you are going to find a simpler/cheaper method. If safety is not an issue, get the cheapest relays you can find that will switch a 0.25A load (or 0.125A, if using 220V). Reed relays are usually pretty cheap.

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killerjackalope
killerjackalope

12 years ago

Hmm It would be easier with either a microcontroller or maybe using simple logic circuits... Though I'm a bit too rusty on them to advise...