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diy af meter help

Old 01-10-2004, 12:21 AM
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Default diy af meter help

Who has made a diy a/f meter? Care to share what schematic you used? I'm looking for one that has been successfully followed since the ones I've tried (on the LM3914N chip) haven't worked. Not sure if I'm doing something wrong, or I just need a good diagram.

Thanks
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Old 01-10-2004, 05:53 AM
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Default Re:diy af meter help

i'm gonna be using the setup at www.diy-wb.com but that's a WB not an A?F gauge
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Old 01-10-2004, 10:22 AM
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Default Re:diy af meter help

Originally Posted by d16tuner
Not sure if I'm doing something wrong, or I just need a good diagram.
The only ones that I have seen are the those. I have seen them work, but I can't say that I have made one on my own.

Here is the schematic that I found most referenced..

http://www.scirocco.org/tech/misc/afgauge/af.html
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Old 01-10-2004, 03:22 PM
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Default Re:diy af meter help

that's the one I'm building currently. My chips are on their way from singapore. When they get here I'll let you know how it turns out. I've ordered 5 chips, and I'll be making 3 gauges initially. does anybody know where I can get a 4.7k ohm potentiometer to adjust the resolution? radioshack discontinued them.
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Old 01-10-2004, 09:28 PM
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Default Re:diy af meter help

I just got the 10k ohm pots. Scale em down and they should do the trick Why would they even make a 4.7k pot - some special use?

Hmmm. I used the same reference. I wonder what I did wrong?? I gues it is time to get a new breadboard and start over.
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Old 01-12-2004, 03:24 AM
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Default Re:diy af meter help

I made/installed A/F meter based on http://www.scirocco.org/tech/misc/afgauge/af.html ... and it works great!
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Old 01-12-2004, 05:25 AM
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Default Re:diy af meter help

Thanks! That is the response I was looking for. Now I know the schematic is good, so I must have done something wrong. Time to try again.

Hmmm. I think I used a 12v regulator, for one thing. I guess that probably would have had something to do with it. Da'oh! Looks like I did everything else right, except for the 10kohm pots which shouldn't affect anything...
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Old 01-12-2004, 08:21 AM
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Default Re:diy af meter help

I made from the schematic at http://www.buckeyetriumphs.org/techn.../AFMonitor.htm
It's a really good implementation because it's nonlinear.
I made mine on a veroboard but I drew a PCB layout. If anyone's interested I'll post it here.
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Old 01-13-2004, 12:19 PM
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Default Re:diy af meter help

I made one on a tester board. It worked for about 2 weeks. I didn't use a voltage regulator, so I think I blew the LM3914N. Here is a pic



I'm going to rebuild another one using LEDS built into my rearview mirror that should be scalable once I get my TE WB built. But for now, I just want to make sure I'm in the right range and don't blow the engine due to detonation, which is all regular A/F guages are good for anyway.
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Old 01-13-2004, 12:30 PM
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Default Re:diy af meter help

wiring that up into your mirror is going to be a bitch, but the end result will be cool. I can't decide if I want to go with a bar of one color of leds or just single leds so I can make them whatever color I want.
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