Search found 14 matches

by toolmaster
Mon Nov 10, 2008 12:02 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Oh, yes...

It is a turbocharged application.

J
by toolmaster
Mon Nov 10, 2008 10:51 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Sensor data...

Hey all - voltage 1bar 2bar 3bar 1.00 29.2 48.0 64.0 2.00 48.1 88.0 126.9 3.00 67.0 128.0 189.7 4.00 85.9 168.0 252.6 5.00 104.8 208.0 315.5 Got that from the company that is supplying me the sensors to work with. I'm working with the 3 bar sensor only - sensor output voltage is the volt column and ...
by toolmaster
Thu Nov 06, 2008 1:22 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Anyone there?

My MAP sensor to test with should arrive any day now... Any chance of a potential schematic?

Thanks!

jay
by toolmaster
Mon Nov 03, 2008 4:50 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Whoops... My bad...

Biggles - good catch. Looked over my notes and re-tested. Here's the 'right' data - and sorry for the wild goose chase. (I also opened up the spare KLR computer I have, and traced back on the pins... More data there too. Moral - don't rely on someone else's internet post of a schematic on a car foru...
by toolmaster
Mon Nov 03, 2008 2:15 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Correct

That's what it looks like to me...

Thanks!

j
by toolmaster
Sun Nov 02, 2008 1:55 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Answers, sorta...

Biggles - KLR - some german acronym I think... It's a 'sportscar' application. Internal to the KLR is the resistors - taht do add to 3k9. I assume there was a shortage of 3k9 resistors in 1990 - when the car was made. I don't see anything particular at the junction other than connectivity to the res...
by toolmaster
Sun Nov 02, 2008 2:44 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Wow - replace a fuel pump ina friend's car, and missa bunch

All - Wow - replace a fuel pump in a friend's Grand Cherokee yest (which is a gas tank pulling experience - with a full tank no less) and leave you hanging for a while... Sorry. Ok... The KLR computer's job is to limit ignition timing and prevent detonation by compensating for boost pressure. It pum...
by toolmaster
Sat Nov 01, 2008 4:48 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

I think I've got something now...

Gents - thanks again! I'll hopefully head over to Radio Shack today to get the parts and stary playing soon. Did have one question... If I use the 7805 regulator for 5V power, and use that to supply the op-amp's power requirements, what happens when the input signal goes above 3.3ish volts? If I hav...
by toolmaster
Fri Oct 31, 2008 5:01 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Gotta love German Engineering...

The gauge is powered through 2 wires. One of them is connected to chassis ground, the other coming off of the 'KLR' computer, on pin 5, which swings 0v to 5v depending on the level of boost. The gauge itself has 2 wires on the back of it - which I actually connected the other night. (This car is a c...
by toolmaster
Fri Oct 31, 2008 1:03 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Gauge Info...

Ok - gauge is about 1k in resistence. The stock configuration (at least I recall a little how to read schematics!) - the gauge is driven though a series of a 1.9k and a 2k ohm resistors. Makes sense to me, as right now - when the ignition is on and the gauge is reading 1 bar, I see about .45v on the...
by toolmaster
Fri Oct 31, 2008 12:18 pm
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Answers, and one more question... ')

First off - thanks to the two of you - I may have to run to Radio Shack tomorrow to get stuff to start trying things out. Biggles - the car does have a wastegate which dumps boost pressure to maintain a preset level. I know that part of the car is working fine. Engineer - thanks for the info! Do you...
by toolmaster
Fri Oct 31, 2008 11:41 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Forgot to add...

The gauge is in fact connected to chassis ground, as is the current sender in the car.

Thanks!
by toolmaster
Fri Oct 31, 2008 11:40 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

I'm very comfortable building circuits..

Biggles - Many thanks for the input. I can and will install this in the cab area, and have a good 12v and ground source readily available. Like I said, Ideally I'd love to be able to dial in the gauge to any particular sensor, meaning that at atmosphere the gauge will read either 1 bar (normal) or b...
by toolmaster
Fri Oct 31, 2008 10:10 am
Forum: General Discussion
Topic: Need some help with an automotive application circuit...
Replies: 28
Views: 4168

Need some help with an automotive application circuit...

Hi all! Thanks in advance if you're able to help me here... It's been 20+ years since I've toyed around with circuits, and I'll admit I forgot most of what I used to know. My application is as follows: I have a gauge in my car, that reads pressure (turbocharged car application). I'd like to drive th...