Bridge caps?

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#21
As you say, this RF is coupled back in to the mains along with all the other rubbish from all the other noisy bridge rectifiers connected to your local substation and probably a good dose of every other type of RF interference known to man.

Correct. This is why a faraday sheild in the transformer is absolutley vital.

In light of this I am at a loss to understand why people then put caps across the diodes and couple all this garbage straight into the amp.

As I pointed out work by "Budda" Camille as taught us the diode crap can be totally wiped out if you know how to do it. Standard diodes being easier than Schottkys to fix.
 
#23
Sounds interesting...

do you know where this can be found ? .... google didn't find it.
Click to expand...
Page 39 Fall 1994 Sound Practices.

John does say " Done properly, silicon diode supplies can be built that are quieter than untreated Vacum diode designs."
I have not tried any of this myself. His methods and cures look complicated to me. They are not simple snubbers.
 
#24
mikelm said:
If you want to reduce the frequency of ringing AND damp it to about 1/2 a cycle try 0.1uF across the secondary and 1uF and 470 ohms across the 0.1uF. In theory this may be a better solution but I have not tried it yet.
Click to expand...

Do you mean, therefore, that the 0.1uF, the 1uF and the 470 ohms are in parallel, between the secondary -ve/+ve?

Thanks for your input, by the way. This is a steep (re)learning curve for me, but I'm getting a good handhold on the way up.
 
#25
what watt?

Another question, if I may:

I intend to use snubbers between the Tx secondaries and the diodes in the bridge. I am using a single 300va 2x25v. For the resistors in series with the secondaries, what wattage rating aught to be used? (And should they be wirewound?)

:scratch2:
 
#26
Do you mean, therefore, that the 0.1uF, the 1uF and the 470 ohms are in parallel, between the secondary -ve/+ve?

yes

Thanks for your input, by the way. This is a steep (re)learning curve for me, but I'm getting a good.

Well, trust your own ears, I hope this idea helps

mike
 
#27
Re: what watt?

falcott said:
Another question, if I may:

I intend to use snubbers between the Tx secondaries and the diodes in the bridge. I am using a single 300va 2x25v. For the resistors in series with the secondaries, what wattage rating aught to be used? (And should they be wirewound?)

:scratch2:
Click to expand...

Any 1 watt metal film resistor should be fine. Obviously the cap should have voltage rating higher than 36V but there again, they normally do.
 
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