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Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Wed Dec 09, 2015 2:09 pm
by maxiice
Tried the box today, i could only get + - 8% on fuel, and even less in "fine tuning" Gonna play a little more wit it tomorrow.

What ohm should i see when turning fuel knob max clockwise ? between pin 7 and 8 or 7 and 12 or is it between 12 and 8 ?

10kohm pot

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Wed Dec 09, 2015 5:10 pm
by Rob Stevens
The actuial pot doesn't really matter, it is a potential divider you are making, the output should see almost 0v one end and 5v the other end of the scale.
the pot track needs ground one end and 5v the other, the signal is taken off the wiper.

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Thu Dec 10, 2015 5:57 am
by maxiice
ok, thanks :) so i am looking for 5 or 0 volt at pin 6 and 7 when the pots at at maximum and minimum ?

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Thu Dec 10, 2015 9:12 am
by stevieturbo
The pot will matter in as much as is it a single turn pot, or multiple turns to achieve any target ?

I know the ones I used require around a single full turn, although I' sure I recall them wanting to be 4.7k ?

From my notes, these are what I used.

http://www.maplin.co.uk/p/omeg-4k7-ando ... eter-fw01b

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Thu Dec 10, 2015 10:24 am
by maxiice
Ok thanks :)
They are regular 270 degree.
Didn't get to play with that today, had some fuel pump problems, so i am making some changes...

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Thu Dec 10, 2015 2:10 pm
by Rob Stevens
yes, the voltage at pin 6&7 should vary 0 to 5v when you twiddle the pots, sounds like you just have the pot wired up wrong.

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Sat Dec 12, 2015 11:50 am
by maxiice
Problem solved :) it was in fine tuning, somehow it didn't always change when clicking on it, but seems to be fine now :) Thanks :D

I have another problem regarding the aux channels, but i can make a new tread in General for that

Re: DTA Dyno Box -- Schematics and Pictures

Posted: Thu Jul 07, 2016 10:21 pm
by Trond E.
stevieturbo wrote:
stevieturbo wrote:A bigger, perhaps clearer image here

http://www.quantums.info/dtalead.htm

And not forgetting as per DTA's pinout schedule that flash programming switch goes between pin 8 and 13 of the 15pin connector.
Link above shows markings

I got only this message on the page: You do not have permission to view this directory or page.

Vhy??

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Fri Jul 08, 2016 3:08 am
by stevieturbo
It's an old web page, maybe it's finally died ?

Re: DTA Dyno Box/Serial Cable -- Schematics and Pictures

Posted: Fri Jul 08, 2016 3:11 am
by stevieturbo
Pics from that page enclosed
dtalead 1.jpg
dtalead2.jpg
dtalead3.jpg