SOHC.co.uk Forums > CB500/550
Electronic ignition
Laverdaroo:
sorry, just seen this, yeah, I'm in, send me some 'dims' and I'll fire some money over as and when required. Thanks for sorting all this out, whoever it is, I've lost track.. ;D
Laverdaroo:
just had another read............Cheers Ken ;D
Oddjob:
Money sent Roo. Sorry for the thread hijack.
deltarider:
--- Quote from: Sesman on January 12, 2022, 10:01:54 PM ---Just a quick and novice question deltarider. The kit claims to have a maximum current rating of 4A. I’m guessing the nominal current draw for the original system is circa 3 to 3.5amps with OE coils? Is that uncomfortably close or are the units generously thermally rated in your opinion?
Apologies for such a basic question, but my electrical knowledge is pretty rudimentary.
--- End quote ---
So is mine actually ;D
To me it seems there is nothing to worry about. Mine have switched current trillions and trillions of times (both 4,7 OEM as well as 3 Ω Dyna coils) and the unit is protected by zener diodes. The old Velleman K2543 parts, like I have used on my bike, have the TIP 162 as a power transistor, which, it seems, is no longer available. The newer which I am about to solder for a friend, have the BU931P transistor. No idea if that makes much difference if any. Experts are welcome to share their views.
AshimotoK0:
--- Quote from: deltarider on January 13, 2022, 09:38:22 AM ---
--- Quote from: Sesman on January 12, 2022, 10:01:54 PM ---Just a quick and novice question deltarider. The kit claims to have a maximum current rating of 4A. I’m guessing the nominal current draw for the original system is circa 3 to 3.5amps with OE coils? Is that uncomfortably close or are the units generously thermally rated in your opinion?
Apologies for such a basic question, but my electrical knowledge is pretty rudimentary.
--- End quote ---
So is mine actually ;D
To me it seems there is nothing to worry about. Mine have switched current trillions and trillions of times (both 4,7 OEM as well as 3 Ω Dyna coils) and the unit is protected by zener diodes. The old Velleman K2543 parts, like I have used on my bike, have the TIP 162 as a power transistor, which, it seems, is no longer available. The newer which I am about to solder for a friend, have the BU931P transistor. No idea if that makes much difference if any. Experts are welcome to share their views.
--- End quote ---
If I was building a points replacement transistorised ignition I would use one of the modern 'ignition driver' transistors like I used in my coil tester in the video link. I will check tomorrow when I am back at work which device I used. ..may well have been a BU931P
https://www.youtube.com/watch?v=qxWtR_m80Fc
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