S4 and Greater Fan Control Module
#1
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S4 and Greater Fan Control Module
All, I've been working through an interesting project in our [my company's] circuit/electronics lab. Thanks to `soontobered84`, I have a nicely fried fan control module from an S4->newer 928. Thankfully, the folks are also gear heads [Cobra kit, 308 Ferrari, etc]; so they graciously reverse engineered the entire circuit board for us. Typically, owners will replace the MOSFET's [aka, "fets"] in the unit. Rather that putting together a simple fix, we decided to reverse engineer the entire circuit in order to upgrade it to modern components. In order for us to calculate the appropriate costs, I would like to gauge the community interest in buying/transferring their S4 fan control switch to a brand new circuit design [fabbed on a modern process].
I _do not_ yet have any costs. Its highly dependent upon volume. It will likely be competitive with or less than current used/refurb models.
Thoughts//Comments?
BTW, SeanR is a ******.
I _do not_ yet have any costs. Its highly dependent upon volume. It will likely be competitive with or less than current used/refurb models.
Thoughts//Comments?
BTW, SeanR is a ******.
#2
If I may, I would add my $0.0928.... Most semiconductor suppliers today have automotive qual'd parts that are designed to operate up to 175C junction temp. For the FETs, Infineon, ON Semi and International Rectifier have good stuff.
For the logic, I would look at Freescale and ON Semi.
Also, today's ceramic caps (MLCC) have enough energy storage capability so electrolytics that dry out and fail.
For the logic, I would look at Freescale and ON Semi.
Also, today's ceramic caps (MLCC) have enough energy storage capability so electrolytics that dry out and fail.
#4
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If I may, I would add my $0.0928.... Most semiconductor suppliers today have automotive qual'd parts that are designed to operate up to 175C junction temp. For the FETs, Infineon, ON Semi and International Rectifier have good stuff.
For the logic, I would look at Freescale and ON Semi.
Also, today's ceramic caps (MLCC) have enough energy storage capability so electrolytics that dry out and fail.
For the logic, I would look at Freescale and ON Semi.
Also, today's ceramic caps (MLCC) have enough energy storage capability so electrolytics that dry out and fail.
#5
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You're new here...
If I may, I would add my $0.0928.... Most semiconductor suppliers today have automotive qual'd parts that are designed to operate up to 175C junction temp. For the FETs, Infineon, ON Semi and International Rectifier have good stuff.
For the logic, I would look at Freescale and ON Semi.
Also, today's ceramic caps (MLCC) have enough energy storage capability so electrolytics that dry out and fail.
For the logic, I would look at Freescale and ON Semi.
Also, today's ceramic caps (MLCC) have enough energy storage capability so electrolytics that dry out and fail.
I'm interested...it's just a matter of time...
#6
Sweet John, glad to see you have taken this on. A few if us have place bets on who in our DFW crew would do it.
#7
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We have the whole circuit mapped out... time to condense and see what the fab costs are locally. The board is a simple, two layer unit. It shouldn't be terribly expensive to have farmed out. Stay tuned...
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#8
Chronic Tool Dropper
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John--
The 'weakest link' seems to be the FETs themselves. Will your modern redesign use something different for those final output pieces?
The 'weakest link' seems to be the FETs themselves. Will your modern redesign use something different for those final output pieces?
#9
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Depends... modern FETs are much more resistant to heat and normal wear/tear. To that end we may use similar, but much more modern FETs. The individual doing the circuit rework is actually an expert in power bus technology, so I trust his judgement on the power circuit design [he is also restoring a Ferrari 308, so he understands the implications of vehicle circuits].
#13
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I'm interested. As Rob said, it's only a matter of time before I have to repair my control unit. I am partial to keeping the flap system working as designed. It is part of the cool factor for me.
Mike
Mike
#14
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Sounds like we have a reasonable quorum for a small fab run. In my experience, most of the local fabs here in DFW don't like running boards in less than quantities of 20. [different for larger/more complex boards]. The nice thing is, these boards are single layer, two sided units. Very easy to build.
#15
Chronic Tool Dropper
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John, add me to the interested list. Will the new boards/circuits rerofit into the existing housing?