Dr Skip wrote:
> Greetings,
>
> I'm helping a family 'in need' repair a gas range, and it uses an
> electronic ignition module (schematic copied below). It is no longer
> available, and the transformer secondary is open. The neon light
> flashes, so assuming electronics are fine, but I haven't probed for
> other problems, so at a minimum, I need to replace T1. Does anyone have
> any practical, simple, and cheap suggestions for a one-off HV
> transformer? Size is important (1 inch sq is original size, but I can
> make a little more room).
>   
A cattle fence transformer or car ignition coil will work (though you'd 
want a 120V to 12V Wall-wart to power it, though the later is bigger. 
The cheap cattle fences appear to actually be a circuit very like that 
off 6V or 12V and using an actual car ignition coil.

That schematic barely electronics :) What stops it sparking? or is the 
"H" wire switched by an opto sensor like an oil burner uses?  I've seen 
old oil boilers with a relay or two and CDS cell and just a very big 
transformer for the spark!


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