Hi Dave, What Ethernet transformers are you looking for, UTP or Coax? I'd guess coax for the distribution amp. These are best scavenged from old Thin Ethernet cards. Look for cards with a BNC connector. Best place is either a electronics surplus place, computer repair shop or shop that sells used computers. Just ask for old network cards. Computer/radio flea markets are another possible source. Thin Ethernet cards also have an isolated DC-DC converter on them (either module or discrete components) with 9V out for 5 or 12V in. Lots of uses, RS232 or op-amp supplies, isolating digital panel meters in PSUs, boosting 12V supplies prior to a constant current regulator to charge 12V batteries from 12V supplies.
Robert G8RPI. --- On Thu, 30/7/09, Dave M <[email protected]> wrote: > From: Dave M <[email protected]> > Subject: [time-nuts] Distribution Amp project > To: "TimeNuts" <[email protected]> > Date: Thursday, 30 July, 2009, 5:16 AM > While investigating recent threads on > Distribution Amps, I ran across a DA > project on Didier's web site at > http://www.ko4bb.com/Timing/Distribution_Amp/ and > http://www.ko4bb.com/ham_radio/Extron_3_80/. > Those pages describe using an > Extron ADA 3 80 analog video distribution amp to distribute > a 10 MHz > frequency reference to lab instruments. It seems to > be a cheap, easy way to > get a set of reference frequencies throughout a small > lab. I would be > interested to hear about any further testing and > characterization was done > with that setup, such as noise, distortion, etc. > > I have a couple of the Extron DAs to play with, and would > like to use them > if they will do the job. I'm only looking for > frequency distribution; not > timing. Frequencies of interest are: > 10MHz, 5MHz and 1MHz. > I haven't been able to find schematics for the Extron DA, > but according to > the author's discussion, it seems to be very similar to the > DA circuit > schematics at http://www.ko4bb.com/~bruce/IsolationAmplifiers.html. > I > haven't had time to reverse engineer the circuit in my > Extron DA, but it > surely would be nice to avoid it if possible. Anyone > have a schematic, or a > source for it? > > Also, looking for a source of low cost 1:1 and 2:1 Ethernet > transformers. > I've tried the local computer shops, but they don't seem to > be interested in > helping. > > Dave M > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
