Dashboard PCB Replacement (CJH Design)
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Re: Dashboard PCB Replacement (CJH Design)
Sounds really interesting. I look forward to seeing what you create.
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Re: Dashboard PCB Replacement (CJH Design)
Looking at Twinturbo's measurement of the dash connection, I see that the image resolution of CJH's connector board is not the same as that of the main board. Here are my measurements of the connector board in millimeters:


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Re: Dashboard PCB Replacement (CJH Design)
Thanks Icosahedron, looks like our final measurements were not too far off. The biggest difference I had was the height, I had a 3mm difference


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Re: Dashboard PCB Replacement (CJH Design)
This is an interesting post. I did some work on this a while ago
viewtopic.php?t=177008
Happy to provide any files. I used jlc PCB to produce the PCBs and was very happy with the price and quality. I don't know how they do it for the prices they charge!!
viewtopic.php?t=177008
Happy to provide any files. I used jlc PCB to produce the PCBs and was very happy with the price and quality. I don't know how they do it for the prices they charge!!
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Re: Dashboard PCB Replacement (CJH Design)
usee JLC for 5 years or more. even used the cnc service to make an alternatpr adaptor for my ford pinto based kit car
TwinTurbo
1985 1.9 DG Caravelle Autohomes Karisma
1985 1.9 DG Caravelle Autohomes Karisma
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Re: Dashboard PCB Replacement (CJH Design)
I see you used trailer cable for the flylead, i had that in mind too.
TwinTurbo
1985 1.9 DG Caravelle Autohomes Karisma
1985 1.9 DG Caravelle Autohomes Karisma
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Re: Dashboard PCB Replacement (CJH Design)
Great post, James. I like your design. It looks like you also went with the multiple board design.
Appreciate the offer to share your files, my prototype is almost finished now.
Appreciate the offer to share your files, my prototype is almost finished now.
1984 Autosleeper, pop-top, 1.9 1Y, 5-Speed
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Re: Dashboard PCB Replacement (CJH Design)
all boards have left hong kong airport... 

TwinTurbo
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Re: Dashboard PCB Replacement (CJH Design)
Clearing customs in london...
TwinTurbo
1985 1.9 DG Caravelle Autohomes Karisma
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Re: Dashboard PCB Replacement (CJH Design)
Excellent progress, TT. I was given the final designs for my prototype a couple of days ago. JLCPCB are out of stock on 4 items needed to populate the board though, so I've got to sit tight until they've restocked next week. It's my first time using them though, so they've offered free assembly which is probably worth it.




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Re: Dashboard PCB Replacement (CJH Design)
how will you heat sink the voltage regulator ? Originally there's a metal plate, admittedly not massive, but necessary
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Re: Dashboard PCB Replacement (CJH Design)
Mica washers were used by CJH. They are meant to be great for heat absorption, do you think it needs a metal plate too? I can probably get one added while I'm waiting
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Re: Dashboard PCB Replacement (CJH Design)
It's probablynot necessary TBH, there will be little current draw and the input voltage is only 14.7ish volts max so the drop is not huge.
But a GND copper fill zone could be used.
But a GND copper fill zone could be used.
TwinTurbo
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Re: Dashboard PCB Replacement (CJH Design)
Mica is a thermal and electrical insulator and not at all suitable for a heat sink. The voltage regulator has to dissipate energy as heat and will need mounting on some form of heat sink. Bolting the regulator to a small aluminium should be okay. Or as twin turbo says a GND copper fill which will have a large surface area. Use a heat sink compound between the regulator and plate to maximise heat transfer and cooling.
Paul F Dennis
1991 Autohomes Komet - 1.9 DG 5 speed manual
1991 Autohomes Komet - 1.9 DG 5 speed manual
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Re: Dashboard PCB Replacement (CJH Design)
Cheers. I have spoken to them regarding a aluminium heat sink and they've said they can add one no problem.
I will enquire about heat sink compound also.
I will enquire about heat sink compound also.
1984 Autosleeper, pop-top, 1.9 1Y, 5-Speed