I'm getting ready to lay out the HV rectifier board for my YC156 project, and it occurs to me to wonder if anyone has ever really heard HV rectifier "white noise" in the receiver? It would be simpler
I thought the reason for capacitors and resistors paralleled with the series diodes was to help equalize the voltage division across the diodes, and reduce the chances of an unequal voltage division
The broadband noise is not due to the current thru the rectifieres but the shot noise the transmitting tube. If the tube is not biased off during receive and you are using an electronic switch or the
Thanks, Ken. You're right about using the resistors to equalize the drops across the older diodes, and (in some cases) the filter caps. In this case, though, it's just about something I heard from Bi
I did not get to the point. The tube is directly coupled to the antenna circuit. If it is not biased off you will get loads of shot noise thru the output coupling network. The powersupply diodes may
Aha - Now that makes sense. I wonder if Orr possibly just assumed the noise was from the diodes? At this point we probably won't ever know. In most cases these days (and certainly in this case) the t
Noise can come from the power supply diodes if there is a choke in there. I built a power supply for a receiver many years ago and I used diodes for the rectifiers and a choke input filter because th
In the old days of rectifier tubes they could make a LOT of noise 73 Roger (K8RI) _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai
I thought the reason for capacitors and resistors paralleled with the series diodes was to help equalize the voltage division across the diodes, and reduce the chances of an unequal voltage division,
Why place a capacitor across each diode string on a full wave bridge? The filter capacitor is always across the transformer secondary. 73 Gary K4FMX _______________________________________________ Am
Thanks to all for the good ideas, guys. Carl's suggestion of putting 4700pf across each leg is one of those elegant ones... The point of overbuilding (in this case with a YC156) is long-term reliabil
Why not? The output of the rectifiers provide some mighty spikes of their own. The capacitors handle it just fine. 73 Gary K4FMX _______________________________________________ Amps mailing list Amps
Are you telling us that you see power line transients across the output of your 3000 volt power supply? 73 Gary K4FMX _______________________________________________ Amps mailing list Amps@contesting
Why not? The output of the rectifiers provide some mighty spikes of their own. The capacitors handle it just fine. 73 Gary K4FMX provided there is no big spikes coming in off the street. In the case
White noise is real but in an amp with RX/TX relay isolation you wont hear it and it may not occur with big diodes. It is noticable with SS receiving and audio gear and a single .01 or so bypass acro
You dont want intense line spikes going thru electrolytics. Carl KM1H _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf
What mighty spikes? What is the rise time, duration and PRR? Have you actually watched a 3000-5000VDC PS on a scope? Carl KM1H _______________________________________________ Amps mailing list Amps@c
ORIGINAL MESSAGE: REPLY: Years ago doing TV repair, it was common to replace one kind of silicon diodes with another kind and all of a sudden have strong noise produced which showed up as balck bars
If there's a problem with spikes on the line, isn't it better to get rid of them with filtering at the line input so they don't reach the transformer in the first place? Steve bridge? _______________
I agree with Carl that you don't want spikes to get into your electrolytics but any semiconductor as well, which of course includes the rectifier string. You might ask how they get through the mains