Supporting > Engine Ancillaries
Multi cylinder ignition systems
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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