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Old 10-06-2019, 05:00 AM   #21
stj
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Default Re: Back EMF / Transient Suppression

if you remember the german kit maker veleman, they did a nice electronic ignition kit that was very simple.
i built one and still have the schems - i'll look later.
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Old 10-06-2019, 03:44 PM   #22
redwire
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Default Re: Back EMF / Transient Suppression

Velleman transistor ignition K2543 is that what you are thinking about.?

A big problem with point to solid-state conversions "ignition amplifier" as they are called- there is no time-out. If the IGN key is on, engine not running and points happen to be closed, it just cooks everything.

I would say the Velleman K2543 needs an update, use an IGBT and include a max. dwell timer. TIP162 Darlington has a 3V VCE(sat) you are losing that as heat, compared to 1.2V with an IGBT. It really matters when starting too having a few extra volts.

The best I have seen, come from Silicon Chip Magazine but they use a PIC microcontroller. Their latest does programmable timing advance. I don't have schematic copies, it's a paywall.

This schematic from http://english.cxem.net/car/car5.php, has a timeout.
Attached Images
File Type: jpg Velleman k2543 pic.jpg (13.1 KB, 3 views)
File Type: png Velleman K2543 schematic.PNG (25.5 KB, 7 views)
File Type: jpg ign with timeout car5-1.jpg (258.7 KB, 4 views)
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Old 10-06-2019, 08:01 PM   #23
stj
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Default Re: Back EMF / Transient Suppression

that's the one, it looks simple but it makes a big difference - specially starting and at higher rpm.
makes a very huge difference in old ford transit vans!!!!
those things have to be rev'd like a motorbike because of the poor HP and shitty gearing.
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