Supporting > Engine Ancillaries

Multi cylinder ignition systems

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BillTodd:
Ok, coil on cap  devices.

My thought was that these are reliable , small  and cheap (less than a tenner on eBay) , so could be used as a single coil  for a model engine.

I don't know the exact driving requirements, but it's probably a capacitor discharge circuit , which could be made quite small and efficient.



Jasonb:
I've recently bought one of these which are cheap and will work on a couple of AA size batteries. at 60mm long excluding the lugs they are small enough to hide.

https://www.ebay.com/itm/203060489106

Graham playing with his

http://www.youtube.com/watch?v=3_U38qnyTC0

And working on an engine, simple mechanical contact so no need for hall sensors

http://www.youtube.com/watch?v=lxbC2WvwXA4

Jo:
If you buy them directly from china they are even cheaper: https://www.aliexpress.com/item/1005007271445496.html

Jo

Jasonb:
Not by much once you have added the delivery and tax, comes out to £6.47

Jo:
I paid £7.16 inc VAT for 2 just now (with 100 crimps I needed for £1.36 to take it over the £8 for the free 8 day delivery). If they don't turn up in 8 days I get £1 off my next order.

Jo

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