# Thread: Frequency to voltage board

1. ## Frequency to voltage board

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Hey boys and girls...

I'm designing the frequency to voltage output board. The specs so far:

1-channel
67hz/volt
~4000rpm/volt
Works with any V3/V4 board

~\$15 per board.

Any changes before I send it out for production?

2. Now you tell me.. After I have already submitted mine. I could have let you do all the work and I could have been lazy and waited. Cool if mine have a problem I can order 2 from you and not have to re-submit.

3. You've got mail..

4. this would be quite useful for figuring out engine speed (based on tach signal) and vehicle speed (based on speed sensor)

you have my attention sir

5. ## Frequency to voltage

Can the circuit be modified to have another range? My max RPM will be 4,000. If I could change a resister and get 1,000 rpm per volt it would be ideal.

6. my question is, how accurate will it be, like within how many RPM?

7. Originally Posted by FredWorrell
Can the circuit be modified to have another range? My max RPM will be 4,000. If I could change a resister and get 1,000 rpm per volt it would be ideal.
yes, you can.

anyway, in current form it's pretty accurate.

brain's good for about 0.01 volt

1v = 4000 rpm

so it'd be good to about +/-40rpm

that's a whole lot better than factory

8. When will it be available for purchase good sir? I havn't seen nick on MSN in a while to talk to him...

I'm gonna be ordering a bunch of stuff soon here.

Do you think that you could get me a schematic with component info for a driver board so that I can power stuff in my car without using relays? I need to power up to 30A circuits... I read up some on some MOSFET's, but I'm no engineer, and I don't fully understand how that jazz works.....

Hell, i'll pay you if i have to...i just want to be able to power some things using solid state electronics instead of relays...

PM me what it's gonna take to get you to do it. I can lay it out as long as i know what components are needed and what is wired to what... I use ExpressPCB to lay stuff out, which is sufficient for what I need usually...

9. we have 40A driver boards coming, compatible with on/off or PWM.

should be available for purchase in a couple weeks.

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