DIY (Homemade) LM-1 RPM Converter
Sep 19, 2005, 10:12 AM
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DIY (Homemade) LM-1 RPM Converter
After borrowing a friends LM-1 wideband and finding that he had not bought the RPM Converter cable I took matters into my own hands. Using some parts from an Electrical Engineering class I had back in college I made my own RPM converter. I'm a mechanical engineer, so this isn't my "thing", but I can manage.
Since I had the breadboard (prototyping circuit board) and a wide range of resistors and capacitors, I only had to buy 1 thing, a frequency-to-voltage converter chip. It cost me $4.
The converter looked like this. Although the final set-up I used was actually less components.
If anyone is interested I will list the parts and give some intrustions on how to put it all together.
Since I had the breadboard (prototyping circuit board) and a wide range of resistors and capacitors, I only had to buy 1 thing, a frequency-to-voltage converter chip. It cost me $4.
The converter looked like this. Although the final set-up I used was actually less components.
If anyone is interested I will list the parts and give some intrustions on how to put it all together.
Sep 20, 2005, 09:46 AM
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Pics of the real set-up and the diagram I used.
The key is a frequency-to-voltage converter chip. I used a NTE 995 (12 pin). You can also use a NTE 995M which is 8 pin. I actually wired mine using a 995M diagram, because the internals are very similar. They cost about $4.
You also need:
- 100k resistor
- 10K resistor
- .01uF capacitor
- 1uF capacitor
The diagram is for the 8 pin chip, I used a 12 pin chip.
The key is a frequency-to-voltage converter chip. I used a NTE 995 (12 pin). You can also use a NTE 995M which is 8 pin. I actually wired mine using a 995M diagram, because the internals are very similar. They cost about $4.
You also need:
- 100k resistor
- 10K resistor
- .01uF capacitor
- 1uF capacitor
The diagram is for the 8 pin chip, I used a 12 pin chip.
Last edited by jid2; Sep 20, 2005 at 09:49 AM.
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