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Post  Levent Suberk Thu Jan 25, 2018 12:36 pm

I found this board. It is a step down DC-DC converter and voltage can be adjusted to 1.5 Volts with trimpot and handle up to 5 Amperes. I will try it with 7.4 Volt LiPo battery for starting Cox engines.

https://m.banggood.com/XL4015-5A-DC-DC-Step-Down-Adjustable-Power-Supply-Module-p-945599.html
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Post  Levent Suberk Fri Feb 02, 2018 3:10 am

I received the board. Firstly I fixed the heatsink on IC with supplied double sided adhesive tape and soldered a suitable connector to board input for changing LiPo battery when necessary. I opened a hole on top of starter box and soldered the glow plug clip cables directly on board output. Bolts and nuts can also be used on box top for glow plug clip connection instead of this. I adjusted 7.4 Volts 1350 mAh LiPo battery output voltage to 1.5 Volts with trimpot. Board has been fixed on battery with hook and loop strips. Whole assembly easily fits in Cox battery box. Foam blocks can be placed in box for packing.

Cox starter battery box templates here

LiPo Battery for Starter Umh1u03h02bvd716g
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Post  coxaddict Tue Apr 23, 2019 11:01 am

I like your idea. I found on the 'bay a similar voltage reducer with a digital display that you can toggle between the input and output voltages. I'll try it with a 7.2 volt 800mah NiCad battery as I already have a few of them. Can the glow plugs handle 2 volts?
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Post  Levent Suberk Tue Apr 23, 2019 11:40 am

Cox glow plugs works with 1.5 Volt. Higher voltage damages Cox glow plugs.

Keep the glow plug cables short to avoid current drop.
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Post  coxaddict Tue Apr 23, 2019 12:45 pm

Thanks, don't want to be burning out glowheads. Now I just need to find a glow fuel resistant clear plastic container to mount everything in so I can see the digital readout.
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LiPo Battery for Starter Empty RCATS is what I use

Post  fredvon4 Fri Oct 25, 2019 11:19 am

Oct 2016 - Case now available inBlue or Red
In a hurry to fly on that sunny day? Did you forget to charge your ni-starter? No problem. This unique device allows you unprecedented starting reliability and will outlast any ni-cad! It will even automatically adjust the current to keep your foul plug glowing for trouble free starts.

• 5200 mAh battery capacity for long battery life (over 1 year with normal use)
• Adjusts current automatically to keep the plug lit
• “Soft Start” slowly delivers current to prolong plug life
• User-selectable startup delay feature (~5 seconds)
• Built in charging system
• Auto shut-off
• Easy to read LED bar graph
• Modular plug clip for easy customization
• Internationally rated power supply (100-240V, 50/60Hz)
• Optional protective glove

Product Code: LIGPD-04

https://www.rcatsystems.com/store/lithium-glow-driver.html


Also the very best clip on for standard glow plugs is Sonic Tronic IMO
http://www.sonictronics.com/xcart/home.php
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