Interest in NB alternator circuit board? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 09-22-2013, 09:43 AM   #1
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 915
Total Cats: 51
Default Interest in NB alternator circuit board?

Is there any interest in a pcb for the alternator circuit?
I prefer Jason's rock solid design over the software alternator control in the latest alpha's. I managed to blew the fuses of the MS3 Pro trying to get it to charge over 12.5V but below 20V ).

I added pad P4 so you can choose to install C3 upright or layed down (space concern).
To fine tune the voltage, I replaced the 48K7 resistor with a 100K trimmer. You should have a spare when you build the Megasquirt (but you can still use a resistor). .
I also added the 'disable' diode as discussed in the 'Disable alternator field' topic.

Supply Gnd, 12V and connect Field to the alternator. When you ground the Disable pin, the alternator stops charging. I use a gen purpose output to disable the alternator while I'm cranking (<700rpm).

I'll make the board 25*100mm so it can slide into the top slot of a standard Megasquirt case.
Having no MS at hand, can someone verify if 100mm would work? I believe a V3 pcb is 101.4mm (4"), but to keep costs down, I can only have them made at 100mm.
I wouldn't want them to fall out of the slots of course, so this needs to be verified..

Price shouldn't be over $10.

Attached Thumbnails
Interest in NB alternator circuit board?-alternator%2520pcb.png  

Last edited by WestfieldMX5; 09-22-2013 at 09:57 AM.
WestfieldMX5 is offline   Reply With Quote
Old 09-22-2013, 10:16 AM   #2
Junior Member
iTrader: (1)
 
Join Date: Apr 2007
Location: Toronto, Canada
Posts: 444
Total Cats: 18
Default

I'm interested in the collective knowledge here regarding the use of L9911 for alternator control. It seems a very simple commercially available solution.



http://www.st.com/web/en/resource/te...CD00046504.pdf
BarbyCar is offline   Reply With Quote
Old 09-22-2013, 10:30 AM   #3
Boost Czar

iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 70,888
Total Cats: 1,469
Default

you want my design to print? you can modify it for the better disable and you can fix my mounting holes i misaligned.
Braineack is offline   Reply With Quote
Old 09-26-2013, 06:48 PM   #4
Junior Member
iTrader: (2)
 
Join Date: Sep 2011
Posts: 320
Total Cats: -1
Default

Interested in the alt board.
tottestad is offline   Reply With Quote
Old 09-27-2013, 07:35 AM   #5
Boost Czar

iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 70,888
Total Cats: 1,469
Default

Does that 100K pot tune the voltage? I've been using all 1% resistors and every board I've but switches right at 14.2v, but I'd like to push it to 14.7v like the stock alt runs at.

sad you werent happy with the pwm alt control within ms3; I thought DIY had success with it.
Braineack is offline   Reply With Quote
Old 09-27-2013, 03:00 PM   #6
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 915
Total Cats: 51
Default

Yes, the pot is to finetune the voltage. I have mine around 14.5-14.6V.
No need to get 1% resistors and there's a spare pot from the opto circuit.
PWM alt control doesn't work at all on my car. I played with it for a while but it either didn't charge or charged over 20V (overload on the 20V setting on my DVM). When the fuse on my Pro finally blew, I decided to call it quits and build the circuit.
No matter what I did, I just couldn't get it right. For the little time it takes to build the circuit, I see no point in spending hours trying to get the pwm right. IIRC, even DIY didn't get it entirly correct (overshooting in some conditions etc). Jason's circuit is pretty much rock solid and with the diode we can disable it at will. Best of both worlds.
WestfieldMX5 is offline   Reply With Quote
Old 09-28-2013, 06:24 PM   #7
Junior Member
iTrader: (2)
 
Join Date: Sep 2011
Posts: 320
Total Cats: -1
Default

Hi Frank,
Toby here. I tried emailing you, but i haven't heard back. Perhaps I have the wrong email address? I hope all is well.
tottestad is offline   Reply With Quote
Old 10-14-2013, 08:45 AM   #8
Senior Member
 
Join Date: Dec 2007
Location: ATL
Posts: 690
Total Cats: 47
Default

YES!

I'm (re)building a MS3 for my 99 and I trust your skills at putting together this circuit more than I trust mine.

PM me at your convenience.
rwyatt365 is offline   Reply With Quote
Old 10-16-2013, 02:30 AM   #9
Junior Member
 
Join Date: Oct 2012
Posts: 138
Total Cats: 3
Default

Is this effort still active? If so, I am interested in two boards.

Thanks
noname4me is offline   Reply With Quote
Old 10-31-2013, 09:01 PM   #10
Newb
 
Join Date: Dec 2009
Posts: 11
Total Cats: 2
Default

Two boards here also.

I am running an AEM-EMS4 on a '00. Still not quite sure why all the posts about this connect 'Field' to pin 1O ( grey/red wire ), and not pin 1T ( grey wire ). From the wiring diagram it looks like 1O read the field output where 1T switches the transistor, which activates an internal relay. Could you explain this?
adamvs is offline   Reply With Quote
Old 11-01-2013, 11:24 AM   #11
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 915
Total Cats: 51
Default

I didn't get any further with this but I'll look further into it.
Only having a MS3 Pro at my disposal, could somebody check if a 100mm board will fit in the slots of the MS2 / MS3 case without falling out?

Odd as it may seem, we definitely use 1O, not 1T. I've looked at the diagrams myself and all I can come up with is that the color codes are wrong or that I don't understand the workings of the alternator. The latter is more likely but who cares as long as it works

Last edited by WestfieldMX5; 11-01-2013 at 11:37 AM.
WestfieldMX5 is offline   Reply With Quote
Old 11-01-2013, 12:01 PM   #12
Boost Czar

iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 70,888
Total Cats: 1,469
Default

Remind me through constant PMs and Emails. I have a MS3x case handy.

I was actually using a standoff on the heatsink to mount mine, but that wouldn't work with the way to cut the case to mount the harness connector.
Braineack is offline   Reply With Quote
Old 11-01-2013, 07:50 PM   #13
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 915
Total Cats: 51
Default

Yeah, that was the reason why I designed the board the way I did.
Once I know they fit, I'll have them made if I don't loose too much money on these.
The thing is that I've just decided to stop building MSses (MSs?), so I really no longer need the boards myself.
Shipment and import duties are stupid expensive :(.
WestfieldMX5 is offline   Reply With Quote
Old 11-02-2013, 03:15 PM   #14
Boost Czar

iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 70,888
Total Cats: 1,469
Default

the boards are right around 100-101mm.

tab to tab it's about 97mm, so i think 100mm would be fine.


every time i think im done building MSes, people keep harassing me and i do them again.
Braineack is offline   Reply With Quote
Old 11-02-2013, 03:42 PM   #15
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 915
Total Cats: 51
Default

Thx Scott, that's perfect.
WestfieldMX5 is offline   Reply With Quote
Old 11-03-2013, 08:34 AM   #16
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 18,839
Total Cats: 345
Default

Scott... add the disable feature from that other thread!
y8s is offline   Reply With Quote
Old 11-03-2013, 10:06 AM   #17
Newb
 
Join Date: Dec 2009
Posts: 11
Total Cats: 2
Default

I made the JC circuit last night. Man, I could write you 30K lines of clean C++, but put a soldering iron in my hands..it can get ugly. A couple of questions:

1) The other 'field' connection to the alternator ( 1T ) is that +12V, GND or just left disconnected?

2) Assuming said software guy has a power supply how do I bench test tis circuit?
adamvs is offline   Reply With Quote
Old 11-03-2013, 12:53 PM   #18
Senior Member
Thread Starter
 
Join Date: Nov 2007
Location: Belgium
Posts: 915
Total Cats: 51
Default

1) Leave 1T disconnected
2) Easy if you have a lab power supply. Connect 12V power source to the 12V input of the circuit and measure the (output) voltage at the Field pin.
Raise the input voltage while keeping an eye on Field voltage. When the input is about 14.4V, the Field voltage should drop to (near) zero.
WestfieldMX5 is offline   Reply With Quote
Old 11-03-2013, 01:29 PM   #19
Newb
 
Join Date: Dec 2009
Posts: 11
Total Cats: 2
Default

Thanks, Frank! Easy enough.
adamvs is offline   Reply With Quote
Old 11-03-2013, 05:20 PM   #20
Boost Czar

iTrader: (60)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 70,888
Total Cats: 1,469
Default

Quote:
Originally Posted by WestfieldMX5 View Post
1) Leave 1T disconnected
2) Easy if you have a lab power supply. Connect 12V power source to the 12V input of the circuit and measure the (output) voltage at the Field pin.
Raise the input voltage while keeping an eye on Field voltage. When the input is about 14.4V, the Field voltage should drop to (near) zero.

When I do it it drops to like 3v or something; but at exactly 14.2v, it will drop.
Braineack is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 53 12-07-2016 04:52 PM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 12:25 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 09:39 AM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 12:45 AM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 12:23 AM.