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SIMPLE DIVIDER PNG CODE
Question is what chip do i replace this with now or modify this current one to display half? The code on top of the chip reads "HML 087 8701" can anyone identify it? Mind you this is a 6 cylinder code plug so me running this would be off by 3/2 i think? I can very easily and cheaply get a 4 coder plug if it makes this easier.
So i decided to dismantle it and took pictures, to my surprise all it is, is one chip, thats it. Thus if we can figure out how, all i really need to do is modify this coder plug. Furthmore for this swap, if you start with a 6 cylinder model, and swap in a 4 cylinder coder plug it will show half of what an tach rate the 8 cylinder is running at. The e30 came in 4 and 6 cylinder models, the tachometer will display correctly in either the 4 or 6 cylinder models IF you swap the correct coder plug (whole cluster replacement not required).
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I think I have made a discovery! I know what is called the "coder plug" on the cluster effects how the cluster displays the tach because the car is a bmw e30 (e30 is the generation of 3 series bmw's from 1984-1991). Yellow – Output modified rpm-signal (to instument cluster) White – Input rpm-signal (from engine control unit) Red – Power Supply (12V on ignition position) Here is one that someone sells if it helps: Would I have to take the 12v feed and have a resistor (how many Ω?) just before the chip? Then my output will also be 5v right? How do I raise it back up to 12V to continue to the tach?
However doesn't the chip require a 5v power? The vehicle puts out 12v.
SIMPLE DIVIDER PNG FREE
I am now a 3rd year University Economics student, so feel free to post up equations if need be.Ī simple D-type flip flop (7474) chip should be able to divide the signal for me. I had taken computer engineering in grade 12 where I used breadboards and all types of gates, so I have some very basic understanding of how circuitry works. I think I can make my own only with a few dollars, and I will learn something along the way! There is already people selling these dividers for the swap I am doing but they are charging $75-100. Thus I need to divide the signal in half. Currently the tachometer reads twice as high because the tachometer is made to read a 4 cylinder (now an 8 cylinder). Long story short, I am doing an engine swap in a 80's 3 series bmw and need to make the tachometer read correctly.
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