A question about the input section of the V3 main board
On the V2.2 board you have D1, 2, 3, 4, 11 as protection diodes, but not on V3.0, at least not on the schematics. It looks like they were there but removed and they don't show up. Any reason why these were omitted? I know the sensors pose little chance of more then 5V, BUT as explained in this thread viewtopic.php?f=38&t=3160 the HEGO could accidently feed battery voltage (12V+) to the circuit if not hooked up correctly. Is it a misprint on the schematic, or is it not needed on a V3 main board?
Rusty
A question about the input section of the V3 main board
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
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Re: A question about the input section of the V3 main board
The diodes tend to create more problems than they solve as they distort the signal at the far ends of its range. The chip has some measure of built in overvoltage protection.
