What is the smallest voltmeter?
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From: Jamie on 31 Jan 2007 19:43 David L. Jones wrote: > On Feb 1, 5:45 am, "Bruce W.1" <s...(a)noDirectEmail.com> wrote: > >>I'm looking for the very smallest -- panel mount -- LCD voltmeter. My >>Google searches have been dissapointing. The smallest I could find is >>about 2" wide. >> >>This will be part of a 12V bicycle light system. It will mount in a >>small box, probably on the handlebars. It's measurement range should be >>about 8 to 20 volts. >> >>A voltmeter is not complicated. I would think that one could easily be >>made in a 1/2" square. >> >>Does anyone know of a really tiny voltmeter? >> >>Thanks for your help. > > > Less than 1" wide: > http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9932909 > Standard 200mV FSD, just make your own input scaler. > > Dave :) > you got to be kidding me, the price will kill the budget before you even get started. -- "I'm never wrong, once i thought i was, but was mistaken" Real Programmers Do things like this. http://webpages.charter.net/jamie_5
From: David L. Jones on 31 Jan 2007 19:54 On Feb 1, 7:03 am, "Bruce W.1" <s...(a)noDirectEmail.com> wrote: > David L. Jones wrote: > > > Less than 1" wide: > >http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9932909 > > Standard 200mV FSD, just make your own input scaler. > > > Dave :) > > ================================================= > > Expensive little guy isn't it? What's your time worth? If it's worth nothing to you then yes, it's expensive, otherwise it's not so expensive. You might be able to get it cheaper elsewhere. > My battery pack (12 C-cells) exceeds its > [14VDC] voltage rating. No problem, drop the voltage with a regulator Dave :)
From: David L. Jones on 31 Jan 2007 20:02 On Feb 1, 10:43 am, Jamie <jamie_ka1lpa_not_valid_after_ka1l...(a)charter.net> wrote: > David L. Jones wrote: > > On Feb 1, 5:45 am, "Bruce W.1" <s...(a)noDirectEmail.com> wrote: > > >>I'm looking for the very smallest -- panel mount -- LCD voltmeter. My > >>Google searches have been dissapointing. The smallest I could find is > >>about 2" wide. > > >>This will be part of a 12V bicycle light system. It will mount in a > >>small box, probably on the handlebars. It's measurement range should be > >>about 8 to 20 volts. > > >>A voltmeter is not complicated. I would think that one could easily be > >>made in a 1/2" square. > > >>Does anyone know of a really tiny voltmeter? > > >>Thanks for your help. > > > Less than 1" wide: > >http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9932909 > > Standard 200mV FSD, just make your own input scaler. > > > Dave :) > > you got to be kidding me, the price will kill the budget before > you even get started. The OP did not specify any budget. He asked for the smallest panel mount LCD voltmeter. If that's the best available then he might just have to pay that. Dave :)
From: chuck on 31 Jan 2007 20:56 Bruce W.1 wrote: > I'm looking for the very smallest -- panel mount -- LCD voltmeter. My > Google searches have been dissapointing. The smallest I could find is > about 2" wide. > > This will be part of a 12V bicycle light system. It will mount in a > small box, probably on the handlebars. It's measurement range should be > about 8 to 20 volts. > > A voltmeter is not complicated. I would think that one could easily be > made in a 1/2" square. > > Does anyone know of a really tiny voltmeter? > > Thanks for your help. Well, you might be able to use LEDs of different colors, or a small seven segment LED (or LCD) to indicate one of 10 voltage levels. Add an led to the display to get 20 levels. But without more information on your constraints and objective function, we're just playing bring me a rock. Chuck ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
From: Michael Black on 31 Jan 2007 21:04
"David L. Jones" (altzone(a)gmail.com) writes: > On Feb 1, 7:03 am, "Bruce W.1" <s...(a)noDirectEmail.com> wrote: >> David L. Jones wrote: >> >> > Less than 1" wide: >> >http://au.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=9932909 >> > Standard 200mV FSD, just make your own input scaler. >> >> > Dave :) >> >> ================================================= >> >> Expensive little guy isn't it? > > What's your time worth? > If it's worth nothing to you then yes, it's expensive, otherwise it's > not so expensive. > You might be able to get it cheaper elsewhere. > Of course, one can make a tradeoff. Go bigger, and the selection goes up and the prices drop. Low end DMMs have become so cheap that using one as a dedicated meter is not outrageous. But then, the original poster wants small. Or get a cheap analog panel meter, even one of those surplus "tuning meters" that have a calibration that doesn't mean a thing. Make the scale. Put a zener diode in series to get expanded scale, so it reads the range you want. The poster can figure out what they really need the meter for, and then come up with some scheme that does the job without overkill. Some LEDs and comparators, or one of those voltage level ICs (their proper name escapes me at the moment), so they get discrete steps. Maybe making sure the voltage is merely "good" and "too low" is sufficient, so two comparators driving two LEDs is sufficient, or there are neater schemes to have LEDs turn on at a given voltage. Michael |