Search found 28 matches

by jsdevel
Thu Sep 21, 2017 9:54 pm
Forum: Peak&Hold Driver
Topic: peak and hold driver transistor insulation
Replies: 3
Views: 2859

Re: peak and hold driver transistor insulation

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.
by jsdevel
Thu Sep 21, 2017 9:52 pm
Forum: Peak&Hold Driver
Topic: P&H board v1.1b INJ4 constantly switched on
Replies: 5
Views: 2172

Re: P&H board v1.1b INJ4 constantly switched on

Turns out I did have a few heat sinks touching the case. Isolating them properly cleaned this up!
by jsdevel
Fri Sep 15, 2017 5:00 am
Forum: Peak&Hold Driver
Topic: P&H v1.1b Q1 is grounding all injectors to MS case
Replies: 5
Views: 2876

Re: P&H v1.1b Q1 is grounding all injectors to MS case

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.
by jsdevel
Thu Aug 31, 2017 2:37 am
Forum: Peak&Hold Driver
Topic: P&H v1.1b Q1 is grounding all injectors to MS case
Replies: 5
Views: 2876

Re: P&H v1.1b Q1 is grounding all injectors to MS case

I ruled out Q1 as an issue. I really wish Jean were around. I could use the schematic.
by jsdevel
Mon Aug 28, 2017 12:13 pm
Forum: Peak&Hold Driver
Topic: P&H v1.1b Q1 is grounding all injectors to MS case
Replies: 5
Views: 2876

Re: P&H v1.1b Q1 is grounding all injectors to MS case

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 ...
by jsdevel
Mon Aug 28, 2017 12:04 pm
Forum: Peak&Hold Driver
Topic: P&H v1.1b Q1 is grounding all injectors to MS case
Replies: 5
Views: 2876

Re: P&H v1.1b Q1 is grounding all injectors to MS case

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!
by jsdevel
Mon Aug 28, 2017 12:03 pm
Forum: Peak&Hold Driver
Topic: P&H v1.1b Injector Impedence
Replies: 2
Views: 1138

Re: P&H v1.1b Injector Impedence

Thanks!
by jsdevel
Wed Aug 09, 2017 12:45 pm
Forum: Peak&Hold Driver
Topic: P&H v1.1b Injector Impedence
Replies: 2
Views: 1138

P&H v1.1b Injector Impedence

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

Image

I measured the resistance, and they're around 3ohm. I have the injectors protected by a 5A fuse.
by jsdevel
Thu Jul 27, 2017 2:29 am
Forum: Peak&Hold Driver
Topic: P&H v1.1b Q1 is grounding all injectors to MS case
Replies: 5
Views: 2876

P&H v1.1b Q1 is grounding all injectors to MS case

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? ...
by jsdevel
Thu Jul 27, 2017 12:32 am
Forum: JimStim
Topic: DSM CAS 24/1 Wheel Pattern
Replies: 3
Views: 1567

Re: DSM CAS 24/1 Wheel Pattern

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!
by jsdevel
Tue Jul 25, 2017 5:00 pm
Forum: JimStim
Topic: DSM CAS 24/1 Wheel Pattern
Replies: 3
Views: 1567

Re: DSM CAS 24/1 Wheel Pattern

Copied this post to msextra for more visibility.
by jsdevel
Sat Jul 22, 2017 8:21 pm
Forum: JimStim
Topic: DSM CAS 24/1 Wheel Pattern
Replies: 3
Views: 1567

Re: DSM CAS 24/1 Wheel Pattern

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...
by jsdevel
Fri Jul 21, 2017 10:53 pm
Forum: JimStim
Topic: DSM CAS 24/1 Wheel Pattern
Replies: 3
Views: 1567

DSM CAS 24/1 Wheel Pattern

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...
by jsdevel
Sat Dec 17, 2016 7:43 pm
Forum: General
Topic: Speedometer Board
Replies: 0
Views: 1535

Speedometer Board

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...
by jsdevel
Tue Dec 13, 2016 7:15 am
Forum: Peak&Hold Driver
Topic: Re-purposing injector pins on DB37 MS2/Extra 3.57 PCB P&H
Replies: 2
Views: 1497

Re-purposing injector pins on DB37 MS2/Extra 3.57 PCB P&H

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?
by jsdevel
Fri Dec 02, 2016 8:48 pm
Forum: Peak&Hold Driver
Topic: P&H board v1.1b INJ4 constantly switched on
Replies: 5
Views: 2172

Re: P&H board v1.1b INJ4 constantly switched on

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?
by jsdevel
Fri Dec 02, 2016 7:50 pm
Forum: Peak&Hold Driver
Topic: P&H board v1.1b INJ4 constantly switched on
Replies: 5
Views: 2172

Re: P&H board v1.1b INJ4 constantly switched on

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.
by jsdevel
Fri Dec 02, 2016 7:07 pm
Forum: Peak&Hold Driver
Topic: P&H board v1.1b INJ4 constantly switched on
Replies: 5
Views: 2172

P&H board v1.1b INJ4 constantly switched on

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.
by jsdevel
Wed Nov 30, 2016 2:28 pm
Forum: Peak&Hold Driver
Topic: MS2/Extra 3.57 DB15 P&H v1.1 wiring
Replies: 2
Views: 1349

Re: MS2/Extra 3.57 DB15 P&H v1.1 wiring

Thanks Jean!