John Ackermann N8UR wrote: > By the way -- > > Despite the discussion in the article about the voltage regulator, TVB > and I have discovered that the Wenzel ULN oscillators are very sensitive > to external factors like power supply noise. When I was testing with an > aged bench supply that apparently had some dried up electrolytics, the > close in noise was degraded by as much as 20 dB from the spec. With a > really good power supply, spec was met easily. > > John > ---- > John
A low noise regulator doesn't necessarily have high line rejection. This is particularly true for some discrete implementations. For example "super regulators" using an AD825 error amplifier without a tracking preregulator. Implementations using discrete transistor error amplifiers may have even lower line rejection. Wenzel's active noise cleanup circuits arent particularly effective at low frequencies unless you cascade several and increase the loop gain by adding another transistor. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.