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martinroger / VXDash

An instrument cluster for the VX220
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Possibly inverted P-MOSFET on Power switch stage ? #33

Open martinroger opened 2 weeks ago

martinroger commented 2 weeks ago

Hey @Alex-XNR , I was checking some things after dusting off the project a bit, and I noticed - just now - that actually the benchboard starts itself regardless of the ignition signal value. I dug up the schematic, and I think I found what is wrong but I might need to double check with you :

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On there, shouldn't Q2 have D and S reversed ? And R65 and D10 should connect to Power_Fused on the left side ? When I simulate it, it seems to work but I thought I would double check with you before correcting that !

martinroger commented 2 weeks ago

Candidate correction in 9ae1b542eb9109c802848487aa74be222306fe4f

Alex-XNR commented 2 weeks ago

Hi @martinroger, yes looks like an error 🫣 As you've said, flip drain and source, keep D10 + R65 between G-S.

martinroger commented 2 weeks ago

@Alex-XNR Imagine my face when I finally wondered why it was starting without me setting the ignition pin on...

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Some like this looks OK to you ?