lipo glo igniter

[gotnitro]

What can take a 7.4v lipo down to 1.5v. So it can work for a glo igniter adapter. ?

[gotnitro]

Also I have 2 11.1v lipos, what will make them go down to 1.5v for the adapter.

[Shawn68z]

What can take a 7.4v lipo down to 1.5v. So it can work for a glo igniter adapter. ?

A 1.5 Volt voltage regulator can do that.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=728-1029-1-ND

[Shawn68z]

What can take a 7.4v lipo down to 1.5v. So it can work for a glo igniter adapter. ?

A 1.5 Volt voltage regulator can do that.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=728-1029-1-ND

Never mind.  Doesnt support that much current.   How much current does a glow plug use?

[Shawn68z]

What about a potentionator? You can wire it as a riostat (sp) , that way you can control the output voltage. ?

[Tom]

You're going to be dumping way too much power.

You've got to go PWM, no two ways about it.

The answer is, not easily, unless you can find a solution someone else has come up with.

[Shawn68z]

Na.   Linear Voltage regulator such as this one would be a good way to do it.

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=296-8158-5-ND


Upto 9V input, and allows the output to be controled from 1.2V to 8V.   Deliveres 3Amps of current with only a .4 voltage drop.   $9.   So gerry, you can build a 2S glow plug ignition for about $15 in electronic parts.

Shawn

[gotnitro]

okay thank you.

[Tom]

What does a glow plug draw?

I'm guessing an amp for now.

So, 11.1 - 1.2 = 9.9 volts you're dropping, at an amp, which means 1 amp * 9.9 volts ~= 10 watts of wasted energy for every 1.2 watts of power out.

You're going to need a big heat sink.

I don't recommend this approach.

[weekend camper]

1. So that would be "why" glo sticks usually come with 1.2v batteries? To reduce the wasted heat released from a larger pack?  (and to fit in your hand)

2. Was there a big heatsink involved on those starters that had the glo stick tied into the main battery?

[gotnitro]

Picked up to standard sub c at battery direct for 4dollars all good for both my igniters. Nimh battery

[Shawn68z]

What does a glow plug draw?

I'm guessing an amp for now.

So, 11.1 - 1.2 = 9.9 volts you're dropping, at an amp, which means 1 amp * 9.9 volts ~= 10 watts of wasted energy for every 1.2 watts of power out.

You're going to need a big heat sink.

I don't recommend this approach.

Its not a good approach, but if you mount it inside your starter box (assuming its metal), then I would use the 12V from the main battery, and use the chasis as the heat sink.  It could work,but I am sure their is a better solution.