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#1
09-03-2002, 02:39 AM
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Ignition module 82 500 SL
Has anyone found a suitable replacement coil drive transistor for the ignition modules in the w107 SL's? The Bosch part number for the module is 0 227 100 023.
The original transistor seems to be a high powered darlington of sort with a Bosch lable on it, which would be impossible to get hold of. I have tried an MJ10012 but would have to limit the base current as it was driven to hard and died. Limiting the drive may also effect the feedback to IC1 and effect the pulse timming, so I would prefer to find a transistor which could handle the base current supplied by IC1. If anyone has any ideas in this or have found a suitable replacement for both the transistor and IC1 if it ever goes, please let us know. Regards Damian 
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#2
09-08-2004, 11:55 PM
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Bump, anyone ever find a replacement for the transistor?
1975 450SEL Request for Help to Get Running Last edited by TwitchKitty; 09-09-2004 at 12:06 AM.
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#3
09-09-2004, 12:29 AM
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an ST BU931T might be worth looking at. 1A base, but 5 peak. It's only in a TO-220, so I can't say how it would be thermally. It is auto-rated, though. A cross showed a TIP152, but that doesn't look good enough.
If you can crack this nut, you could probably start a tidy business.
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#4
09-09-2004, 12:59 AM
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if there is an identifier number i'd give Newark Electronics they have an 800 number. they are hugh and might be able to cross it. i get all my electronics from them for my CNC equipment. just a suggestion for a solution.
another way to go is to buy from petronics for about 70 bucks and replace all that nonsense. i will do that to save my switch cause i plan on the 72 being all original. but to merely drive it the petronics is a much stronger ignition. here they are http://www.vintageperformance.com/retrorockets/index.htm
__________________
Thanks Much! Craig 1972 350sl Red/Blk 117k 1988 420sel charcoal/Blk 140k 1987 420sel gold/tan 128k See My Cars at:http://mysite.verizon.net/res0aytj/index.html Pound it to fit then Paint it to match! There is only First Place and Varying degrees of last! Old age and deceit will overcome Youth and Enthusiasm every time! Putting the square peg in the round hole is not hard... IF you do it fast enough! Old enough to know better but stupid enough to do it anyway!
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#5
09-09-2004, 12:50 PM
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Thanks for the replies, I posted pictures of the igntion module in the thread that is linked above.
I will be posting what I ultimately find there also.
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