Speedometer amplifier - Page 3 - Alfa Romeo Bulletin Board & Forums

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post #31 of 55 (permalink) Old 10-24-2014, 05:49 AM
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Ok, thank you Kredden.

One last question: Can I , with this change, keeping the original GTV wiring?

Alfetta GTV 2.0 1982
Toyota Celica Turbo All Trac 1991
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post #32 of 55 (permalink) Old 11-30-2014, 05:34 AM Thread Starter
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Quote:
One last question: Can I , with this change, keeping the original GTV wiring?
See the diagram in post #16

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #33 of 55 (permalink) Old 11-30-2014, 05:36 AM Thread Starter
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Just a reminder that I can test Milano speedometer amplifiers and senders. Rob Steele sent me 3 amplifiers and two senders to test. Both senders and two of the amplifiers were good and I returned them to him. I am awaiting electrical components to help me repair the 3rd amplifier.

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76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #34 of 55 (permalink) Old 01-14-2015, 08:41 AM Thread Starter
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I successfully repaired Rob's bad amplifier today. It was a blown transistor.

Ed Prytherch
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85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #35 of 55 (permalink) Old 01-14-2015, 09:35 AM
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Interesting, what did you use to seal the guts back in?

Kevin

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post #36 of 55 (permalink) Old 01-14-2015, 10:30 AM Thread Starter
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There is no seal. The PCB pops out of the housing. It is held by small tabs.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #37 of 55 (permalink) Old 01-14-2015, 11:56 AM
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OK, I didn't know that, it looked like it was sealed, I'll have to take a closer look next time!

Kevin

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post #38 of 55 (permalink) Old 01-14-2015, 12:28 PM
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Quote:
Originally Posted by kredden View Post
OK, I didn't know that, it looked like it was sealed, I'll have to take a closer look next time!
You may be thinking of the hall effect sensor that goes into the transmission? The amplifier box is the black box under the rear seat that the sensor plugs into.

Tom

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post #39 of 55 (permalink) Old 01-14-2015, 01:31 PM Thread Starter
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Quote:
hall effect sensor
It is an inductive sensor. The hall effect sensor is in the distributor.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #40 of 55 (permalink) Old 01-14-2015, 01:44 PM
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Actually you are sort of right, I was thinking that Ed fixed the sensor, missed that it was the amplifier!

Kevin

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post #41 of 55 (permalink) Old 01-14-2015, 03:01 PM Thread Starter
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The sensors are simple and robust. I can check one out if you think it might be defective.

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #42 of 55 (permalink) Old 02-26-2015, 02:19 PM
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Big thanks for making this thread.

Not so relevant maybe, but it may make me give my MPGuino project another chance.

I got it to run sorta okay. But whenever I started to drive, espesially at higher speeds it would be totally off, or just read zero.

Had it running perfectly in an alfa 155. But not with the 75 so far.

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post #43 of 55 (permalink) Old 11-13-2015, 07:19 AM
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Hello, me again

I was looking on the Dakota Digital website, but on their catalogue there is no trace of the SGI-5C.

Do you know if there is a product Dakota marked with the same technical features?

Maybe they have updated their products with others more recent, but i want to be sure before buying something (i live in Italy)

Thanks

Alfetta GTV 2.0 1982
Toyota Celica Turbo All Trac 1991
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post #44 of 55 (permalink) Old 11-13-2015, 07:31 AM Thread Starter
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Here it is: Universal Speedometer Signal Interface

And here is a vendor: Dakota Digital Universal Speedometer Signal Interfaces SGI-5 - Free Shipping on Orders Over $99 at Summit Racing

Ed Prytherch
79 Spider
85 GTV6 3L
76 Suzuki GT500

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke
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post #45 of 55 (permalink) Old 11-13-2015, 09:10 AM
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Is it just a VR signal that's coming from the sensor? If so, a simple LM1815 circuit can convert it to a 5v transistor level circuit and from there you can convert it to whatever you want with a cheap arduino. I'm doing something similar with an ABS sensor signal for my TSD rally computer.

My Alfas: 2011 159SW 2.0jtdm, 89' 75 2.0TS, 2x85' 90 2.0IE and 2.0v6, 83' Alfasud Berlina (1.7 8v boxer). Ex: 93' 164 (3.0 V6 12V), 96' 145 QV (2.0 TS 16V)
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