Author Topic: questions about 5v (115r) COP output regulation  (Read 8013 times)

Offline rossi46numberone

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questions about 5v (115r) COP output regulation
« on: December 13, 2011, 09:12:14 pm »
Hi everybody,
I'm driving my Golf 4 (1.8T 20v)allday long with my 3.7 installed and it work fine...
But for more reliability I would like to change my old style 3 wires COP for the more recent (115r)with 4 wires (5 Volts trigger).
After some some test on the bench I find that I need +5v to trigger it .
My idea is to use a LM7805 to get stable 5v without worrying about the input.
Why?
because the voltage is never the same and if I use simple resistor, the output will follow these fluctuations.
My questions is :
Can I use this regulator in serial with the direct output of the igbt/logic driver or it would be better to work with stepper driver?
I think yes for both of solutions, but your advice will be very helpfull to confirm

Thanks guys  ;)
« Last Edit: December 13, 2011, 10:13:54 pm by rossi46numberone »

Offline GintsK

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Re: questions about 5v (115r) COP output regulation
« Reply #1 on: December 13, 2011, 10:02:05 pm »
Do you also find 12V as not usable for driving these coils?

I think many users drive 4 VAG active coils from stepper output + 1 coil from IGBT Logical level input trough 2x510 Ohm in parallel.

Offline MWfire

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Re: questions about 5v (115r) COP output regulation
« Reply #2 on: December 14, 2011, 11:43:12 pm »
i always drives that coil from stepper output(12V) with 100-330ohm in series without problems.

Offline GintsK

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Re: questions about 5v (115r) COP output regulation
« Reply #3 on: December 15, 2011, 09:18:46 am »
IIRC I had done it directly with no resistors.

Offline rossi46numberone

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Re: questions about 5v (115r) COP output regulation
« Reply #4 on: December 17, 2011, 01:23:42 pm »
Hi,
Job's done,I 've used two LM7805 and stepper pin 4 & 5 (EC18) and it work nice....

Thanks guys for your advice ;)

Michele.

Offline rossi46numberone

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Re: questions about 5v (115r) COP output regulation
« Reply #5 on: December 20, 2011, 11:15:37 pm »
I'm back with some bad news  :-\
I've fried one of the LM7805 and it's seems that my stepper driver fail ???
In fact after that issue,I have some hard cut-off(like missfire but stronger) when I connect my laptop with Vemstune open,I feel that the problem happens when the pressure increases and after that the Vemstune disconnected himself and no communication.
If I run my car without connecting the laptop no trouble at all.....
Thing strange is that I can hear these cut-off through my audio speakers,it sounds like an electric parasite.
Now i drive my coils by the logic level trought a 330 ohm resistor and it work great but the problem persist.

Michele.