On Apr 3, 2006, at 5:30 PM, L. V. Lammert wrote: > At 05:05 PM 4/3/2006 -0500, you wrote: >> How close does a transformer have to match the device's listing? > > You *must* match polarity and type (i.e. DC or AC), .. voltage can > be a tad > high (but not lower) - e.g. a 12V input can probably accept 12-14V. > >> We've got several devices at ByteWorks which describe the input >> voltage with a little symbol that looks like this: >> >> 6V DC >> (-)--C*--(+) >> >> The asterisk is actually a dot is should be inside the C. The symbol >> means the outside contact is negative and the inside contact is >> positive. (anyone know the name of that symbol?) > > ahh, .. a dot? It is just indicative of the center connector (pin > or socket).
Does the entire symbol have a name, i.e. not just the center connector, but the center connect plus the outer connector plus the polarity? >> The transformers have corresponding information: >> >> Input: AC 120V 7W 60HZ >> Output: DC 6V 500mA >> (-)--C*--(+) > > Is that not identical to the requirement, or did I miss something? > You're > showing a +6VDC on center requirement, and a +6VDC [center] wall wart? Yes, those are identical. That's my positive control example. It's what I know works. Now, how far can I deviate from what is known to work? >> That is, can I plug in a transformer with 9V output >> into a 6V input, or use a transformer that can output 1200 mA instead >> of 500mA? > > 1200 mA is not a problem, as it is just 'capability' - you can go > higher > but not lower. Aha, that's what I wanted to hear. > A 9V could be a problem in a 6V input, .. it's also the 'type' of > input. > 12V can really mean anything from 12 to 16 volts, whereas 6 or 9 > VDC would > be a 'regulated' power supply. So, the input voltage must be the same or a little higher, but not too much. Thanks, Lee. Regards, - Robert http://www.cwelug.org/downloads Help others get OpenSource software. Distribute FLOSS for Windows, Linux, *BSD, and MacOS X with BitTorrent _______________________________________________ CWE-LUG mailing list [email protected] http://www.cwelug.org/ http://www.cwelug.org/archives/ http://www.cwelug.org/mailinglist/
