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My kit only came with 4 mica insulators. I ordered a 5th from digikey for the TIP24C, and found that my voltage was much more stable. I had the board mounted to my MS2 case which is grounded to the MS2.

Turns out I did have a few heat sinks touching the case. Isolating them properly cleaned this up!

I figured it out! Turns out that all the TIP121's were fried. Ordered some compatible TIP122's from DigiKey and BOOM!

I was able to rule them as the issue when I had voltage at the base when testing the LM1949n's.

The lm1949n datasheet was extremely helpful.

I ruled out Q1 as an issue. I really wish Jean were around. I could use the schematic.

Also, I have tested without the driver board using LEDs on a bread board, and I'm getting proper 5v signals on each injector. So basically, none of them are working through the board. I did make the mistake of grinding off part of the screw attached to the heat sink with a dremmel. Is it possible I ...

Have you resolved your problems?

Not yet.

Did the problem appear on all 4 injection channels?

Yes. All 4 are grounded and aren't working.

I'll checkout the links. Thanks!

Thanks!

Can the following injectors be driven by the v1.1b board?



I measured the resistance, and they're around 3ohm. I have the injectors protected by a 5A fuse.

Hi Jean, My injectors stopped working, so I put my MS2 on the JimStim to troubleshoot. I noticed that all of the injector grounds were grounding to my MS case. On a hunch I disconnected Q1 from my MS case and the injector grounds are no longer grounding at the case. What would cause this to happen? ...

NVM. It worked! Like an complete noob, I had 4g72 selected on the DIP (456 ON). I replaced 4g63 in the wheel patterns file. Once I selected 4g63 on the DIP (23 ON) it worked!

Copied this post to msextra for more visibility.

So I attempted to replace the stock 4g63 pattern in the text file with my 24/1 pattern above, but it didn't appear to work. Here's the output in my command prompt: C:\Users\Joseph Spencer\Desktop>wheel_converter.exe wheels_default.jsw foo.jsr COM3 9600 Signature: JimStim format V2.0.4 ********* whee...

Hi Jean, I'm following the directions in the docs for wheel upgrade . I have a 24/1 high res trigger disk that I'd like to simulate with the JimStim. Here is the wheel that I'm using: https://yoshifab.com/store/images/cache/casdiskdsm.500.jpg I'm familiar with reading C code, so I think all I have t...

Hi Jean, I've found several write ups on using a speedometer with a Frequency to Voltage converter circuit. The controller that's typically recommended is this one by Texas Instruments (LM2917) . Here is an example circuit that uses it . While purchasing the converter isn't that big of a deal, creat...

Thanks!

With the P&H v1.1b driver board and MS2/Extra on a 3.57 PCB, I'd like to re-purpose the original injector pins on the DB37. Is this possible? I'd like to use them for ADC or switch input.

Also, is it possible to remove a few of the MOSFETS on the 3.57 PCB with sequential?

OK. Remounted Q5 and now I show around 200 mV from 5v to INJ4. Is that normal? Could that be stored capacitance or did I fry the MOSFET?

OK. Mounting tab of Q5 to 5v ground showed an OHM value of ~ 186 on my multimeter. The rest all showed greater than 2.5 K OHM. I'll re-mount Q5 to the case and ensure there are no burs touching the screw.

After assembling my board and wiring it up to my MS2 card, INJ4 was constantly on. I verified that the jumper wires each had 12 Volts. Any help would be appreciated. Cranking my cam/tach input lit up the LEDS on INJ1-3.

Thanks Jean!