Recap of the SAI circuit
09-14-2011, 10:04 AM
#16
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If anyone needs electronics help with their prototypes, please feel free to PM me (I've been doing electronics for 40 years)
It would also be a very simple task to design a very quick and inexpensive printed circuit board (probably around $5 + parts) which would make assembly much easier...sort of like an old Heathkit.
It would also be a very simple task to design a very quick and inexpensive printed circuit board (probably around $5 + parts) which would make assembly much easier...sort of like an old Heathkit.
09-14-2011, 12:19 PM
#19
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Is there a specific size the PCB should be?
Would an assembled board be better than a bare board/bag of parts? I know some people don't like to solder.
I took a quick look at the schematic and it looks OK, I would perhaps make some minor changes.
(I designed OEM electronics for Porsche, Audi, Mercedes so working on a 12V automotive bus is something you don't forget)
I could probably do something like this on a rainy weekend, send the files out to have boards made (usually 1 week) and assemble a few in my basement electroncis shop.
Would an assembled board be better than a bare board/bag of parts? I know some people don't like to solder.
I took a quick look at the schematic and it looks OK, I would perhaps make some minor changes.
(I designed OEM electronics for Porsche, Audi, Mercedes so working on a 12V automotive bus is something you don't forget)
I could probably do something like this on a rainy weekend, send the files out to have boards made (usually 1 week) and assemble a few in my basement electroncis shop.
09-14-2011, 01:16 PM
#21
I would also buy a board. Just so things are clear -- this enables us to physically remove the SAI system from our cars, including the OBDII ones, and never have a problem with getting smogged/CEL's?
09-14-2011, 01:29 PM
#22
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09-14-2011, 02:14 PM
#23
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I don't mind doing the PCB layout and soldering/assembling the boards.
I am not looking to make any profit from this, so it would just be cost + shipping.
I will double check with the Admin (Bob) to make sure there are no issues.
I am not looking to make any profit from this, so it would just be cost + shipping.
I will double check with the Admin (Bob) to make sure there are no issues.
09-14-2011, 02:25 PM
#24
That's correct. You would no longer see SAI errors but other CELs unrelated to SAI are still possible which is a good thing.
09-14-2011, 02:31 PM
#25
Is there a specific size the PCB should be?
Would an assembled board be better than a bare board/bag of parts? I know some people don't like to solder.
I took a quick look at the schematic and it looks OK, I would perhaps make some minor changes.
(I designed OEM electronics for Porsche, Audi, Mercedes so working on a 12V automotive bus is something you don't forget)
I could probably do something like this on a rainy weekend, send the files out to have boards made (usually 1 week) and assemble a few in my basement electroncis shop.
Would an assembled board be better than a bare board/bag of parts? I know some people don't like to solder.
I took a quick look at the schematic and it looks OK, I would perhaps make some minor changes.
(I designed OEM electronics for Porsche, Audi, Mercedes so working on a 12V automotive bus is something you don't forget)
I could probably do something like this on a rainy weekend, send the files out to have boards made (usually 1 week) and assemble a few in my basement electroncis shop.
One variant I did from the schematic, is the 12v ground wire was connected to the chassis directly instead of the gray O2 sensor lead just to make it more convenient.
09-14-2011, 02:45 PM
#26
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I'll take one too, Lewis. Thanks for the offer!
That being said I can see how this easily could turn into a 100+ unit job so if you decide to outsource it I would be more than happy to cover the costs. I'm sure most people here would be too.
Thanks again!
That being said I can see how this easily could turn into a 100+ unit job so if you decide to outsource it I would be more than happy to cover the costs. I'm sure most people here would be too.
Thanks again!
09-14-2011, 03:42 PM
#27
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A question on wire termination options.
1. soldered wires, say 12" long, coming off the board
or
2. use screw terminal blocks, allowing you to chose wiring type/length/etc...no soldering required (they are fairly inexpensive), just a screwdriver
Example:
http://search.digikey.com/scripts/dk...name=A98036-ND
It would be the same PCB, in the first case, I simply don't install the terminal block and solder wires instead.
I have sent a PM to the Admin and IB, just to make sure there is no conflict of interest (I am not a RL sponsor and not doing this for a profit... more of a hobby).
Once I hear back, I will likely setup a seperate thread to keep track of who would like the PCB. It will be small enough to be sent via USPS (which should keep costs down)
1. soldered wires, say 12" long, coming off the board
or
2. use screw terminal blocks, allowing you to chose wiring type/length/etc...no soldering required (they are fairly inexpensive), just a screwdriver
Example:
http://search.digikey.com/scripts/dk...name=A98036-ND
It would be the same PCB, in the first case, I simply don't install the terminal block and solder wires instead.
I have sent a PM to the Admin and IB, just to make sure there is no conflict of interest (I am not a RL sponsor and not doing this for a profit... more of a hobby).
Once I hear back, I will likely setup a seperate thread to keep track of who would like the PCB. It will be small enough to be sent via USPS (which should keep costs down)
09-14-2011, 03:51 PM
#30
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Thanks for doing this Lewis. Looks like there is lots of interest.
I would suggest soldered wires coming off the board. That makes it one less step to install and I don't have to think about what kind of wires I want to use. The users who want a very specific wire and length will probably change it anyway.
Are you thinking of providing boards with components installed, just a board, board and kit of parts, or all three variations?
Other posts have brought out concerns of liability if the circuit should cause some problem to their car. You may want to provide a kit of parts with instructions and let the builder accept responsibility. I don' tknow the interface to the ECU and what the possibility is of ECU damage if a short to ground or short to hot should occur.
I would suggest soldered wires coming off the board. That makes it one less step to install and I don't have to think about what kind of wires I want to use. The users who want a very specific wire and length will probably change it anyway.
Are you thinking of providing boards with components installed, just a board, board and kit of parts, or all three variations?
Other posts have brought out concerns of liability if the circuit should cause some problem to their car. You may want to provide a kit of parts with instructions and let the builder accept responsibility. I don' tknow the interface to the ECU and what the possibility is of ECU damage if a short to ground or short to hot should occur.