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Regulating a Spark Answered

I need to build a unit capable of supplying a timed spark. At approx 1 sec intervals. The unit will need to be small/cheap to build and be able to supply current as to generate a timed spark across two electrodes via 240v power supply. The unit I am attempting to build is a flammable gas warning/ignition device. The purpose of it is to ignite the first immediate gas detected, as to avoid a larger detination later. The unit will be made of machined aluminum. It will consist of a vapour detector hooked to a fan unit, which inturn vents the gas to the ignition device. Thus igniting the gas. At the moment I am working on the ignition system, hence the question. Thanks for any help.

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westfw (author)2008-12-16

You can get electrical "ignitor" units for gas stoves, furnaces, and so on; they've replaced most pilot lights.

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Lftndbt (author)westfw2008-12-27

I just aquired a 1.5V Pulse igniter. Seems perfect for the application. Thanks for the suggestion.

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Lftndbt (author)westfw2008-12-16

Sorry, not sure if I follow. They have full electrically ignitors? I was only aware of the peizo (sp?) type. Do they use a timed circuit?

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NachoMahma (author)Lftndbt2008-12-16

. Outdoor stoves commonly have piezo ignitors, but most home units have an electronic spark generator. The one on my stove sparks ~twice/sec when power is applied. . Or use a glowplug, as on my furnace.

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Lftndbt (author)NachoMahma2008-12-16

Yeah derrrr... I don't know why I had a mental block. Of coarse there are electronic ignitors. I believe I have used a few too. In AU most of our heaters/furnaces still use manual piezo ignitors.

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Gjdj3 (author)2008-12-17

You could probably do something with a camera flash circuit. You could change the time between sparks depending on the cap size.

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guyfrom7up (author)2008-12-17

you don't need much current (several mA will do), so you better not be hooking that directly up to mains. I'm thinking... maybe relay?

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Lftndbt (author)guyfrom7up2008-12-17

I was hoping to use a transformer. I only need to ignite flammable gas , not cause a huge spectacular spark.

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11010010110 (author)2008-12-17

make circuit with 555 and transistor that outputs square wave. he length of one piece of the wave is 1 sec and it consists of long '1' time and short '0' time a tv flyback circuit (tv flyback transformer and transistor that makes it make continuous arc) are connected directly to the supply the transistor on the 555 output shorts the feedback of the flyback circuit to earth most of the time and disables it all this is powered with DC low V medium A from power supply plugged into mains once in a second you get a continuous arc for fraction of the second (not single flash)

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Lftndbt (author)2008-12-16

I believe I may be over thinking this. You can create a timed circuit via running power, through an appropriate capacitator can't you?

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