SOHC.co.uk Forums > CB500/550

Electronic ignition

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AshimotoK0:
Here is an epoxy-glass (FR-4)  PCB I designed and had made last year. The dark green is an epoxy mask that coats the board but doesn't cover the areas that are to be soldered.

I checked and the ignition transistor I used in my tester and was a BU323Z (I will always remember it now as ---323---is the CB500/4 centre part code reference ;D.  ) It's specifically designed for electronic ignitions etc. and has an internal  360v clamp.

http://www.farnell.com/datasheets/1916279.pdf

deltarider:
Could it be that the 'Z' in BU323Z stands for an integrated zener diode?
Addition: Just saw in the spec sheet, it indeed is.

Sesman:
For clarity, are you guys recommending I source a 323 as a direct replacement for the TIP unit? Or should I go with the BU931P?

AshimotoK0:

--- Quote from: Sesman on January 14, 2022, 10:12:07 AM ---For clarity, are you guys recommending I source a 323 as a direct replacement for the TIP unit? Or should I go with the BU931P?

--- End quote ---

What's your circuit Phil?

Sesman:
Hi, Ash

Electronic Ignition.

I’m intending the replicate the Velleman product, but by buying individual components rather than the ‘kit’. In doing so I’m going to build 2 systems. One for the 500 and one for the 550. The way I see it it’s cheaper than buying OE capacitors and the avoids the concerns over unreliable capacitor copies.

Although the Belleman item is good value in my opinion at about £35 per bike.

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