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| DMM Tach. Add-On |
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| Bluechip:
Piccy of cct. boards.. General Idea (R.P.M. x # Slots in Disc) / 60 = Frequency So assuming 4 Slots in disk .. 131.3 Hz = 1969.5 RPM. I got 1970. This is linear to ( as far as I checked, about every 500 RPM.) to 633.3 Hz ie. 9500 RPM. Nice Chip, thanks to National Semiconductor Inc. Other board is a Xtal cmos Oscillator / divider for calibration. http://s359.photobucket.com/albums/oo31/Bluechip_mech/?action=view¤t=013.jpg dave |
| Darren:
This site just gets more and more interesting by the day :thumbup: |
| Bluechip:
What? Want more? Good grief, world is awash with strange folk .. thought I was unique . OK. If anyone might like the cct. diags etc. will do 'em. Will re-draw originals to ensure correct, I have a habit of modding circuits and not updating record. dave |
| Darren:
nowt stranger than you'll find one here, just ask my missus :lol: |
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