Rex wrote: > Bruce Griffiths wrote: > >> For a 10MHz isolation amplifier you dont need any transistors much more >> exotic than 2N3904's in an appropriate package. >> 3 or 4 2N3904's per isolation amplifier stage will with careful design >> and layout achieve a reverse isolation of more than 130dB. >> >> >> Bruce >> >> >> > > Bruce, you seem to have a tendency to tantalize. Couldn't you have > pointed him to a reference (or two) to a pretty-darn-good circuit > implementation that uses transistors? > > I admit, I read most of the posts, but often I lose track and can't > figure out if consensus is being achieved in the long threads. > > Also, only being casually into all these time/frequency issues, I do > lose track of some of the simplistic better things I thought I once knew. > > Do we, or should we, have a FAQ? I know there are a couple or more great > repositories provided by members. Many thanks to all you guys. But it > seems like a lot of this could be covered by -- oh yes, go read number 7 > and then come back if you need more. > > Has this been discussed before? Should we start a new thread or should I > just shut up? > > > > I've collected links to most of the useful references on isolation amplifiers are at the bottom of:
http://www.ko4bb.com/~bruce/IsolationAmplifiers.html <http://www.ko4bb.com/%7Ebruce/IsolationAmplifiers.html> However, they don't include the earlier, less useful designs like the 2 JPL versions. Rather than using perf board it would be better to assemble a TADD-1: http://www.tapr.org/kits_tadd-1.html Performance for which is shown: http://www.febo.com/pages/amplifier_phase_noise/ http://www.leapsecond.com/pages/tadd-1/ To achieve good reverse isolation a good ground plane is essential. If necessary one can use point to point wiring over a ground plane. Once you've read these and decided if you want to build a discrete distribution amplifier, I can show how these circuits can be used in distribution amplifiers. Bruce _______________________________________________ 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.
