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Old 4th December 2008, 01:21 PM   #11
reiver is offline reiver  United States
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Default My possible choices....

So... from an novice amp builder without a scope to use, here's what I've gleaned:

- If you want to build your own bridge use four soft-recovery diodes like the Ixys DSEP 15-12CR . No snubber cap is needed due to the soft recovery feature.

- Or use and all- in-one soft recovery bridge like the Ixys FBE 22-06N1, again no cap is needed due to the soft-recovery.

- The Ixys VBE 17-06NO7 looks interesting but doesn't look to be soft-recovery, so I guess a cap/resistor would be needed to dampen any rf trash.

Opinions..........?

-Bryan
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Old 2nd July 2016, 01:52 PM   #12
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Hi !
sorry to take up again a very old thread
if the bridge is of this type ...

Click the image to open in full size.

could it be enough to place just one 0.1uF cap across + and - output terminals ?
I do not have instruments to see what actually happens
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Old 2nd July 2016, 07:12 PM   #13
AVWERK is offline AVWERK  United States
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The first post was clear on placement, across the AC or transformer connection.
Snubbing across each diode is dependant on a particular combination and not generic in nature.
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Old 3rd July 2016, 07:57 AM   #14
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Quote:
Originally Posted by AVWERK View Post
The first post was clear on placement, across the AC or transformer connection.
Snubbing across each diode is dependant on a particular combination and not generic in nature.
Hi ! thanks for the helpful explanation
clearly I got it wrong. Yes I was thinking to diodes snubbing.
I understand that diodes switching creates a high Hz noise difficult to suppress.
I wonder if Schottky integrated bridges exist. I like extremely the convenience of an integrated bridge, with markings to ease connections.
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Old 3rd July 2016, 10:42 PM   #15
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Quote:
Originally Posted by reiver View Post
So I'm guessing it's a good idea to always have a cap of some sort on a bridge rectifier to cut potential noise?

-Bryan
On low voltage class ab amps I have never needed caps across bridge.

The only time I found I needed them was a on a valve mixer running at 200 volts. Later I found out I was simply using wrong diodes and the ones I was using switched very noisily.
I now use HER158G diodes and don't need caps.
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Old 4th July 2016, 05:35 AM   #16
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Quote:
Originally Posted by nigelwright7557 View Post
On low voltage class ab amps I have never needed caps across bridge.
The only time I found I needed them was a on a valve mixer running at 200 volts.
Later I found out I was simply using wrong diodes and the ones I was using switched very noisily.
I now use HER158G diodes and don't need caps.
Hi and thanks for the helpful advice.
May I ask you if you heard the noise or you have only seen it on instruments ?
And if you have seen it where it was located in Hz ?
My opinion is that lab instruments are very important because if I do not see problems using the instruments I will not hear problems.
Because there are no problems.
I am not sure that if I see issues with the instruments I will be able to hear them.
For instance some equipment with good level of distortion can sound quite enjoyable.
Personally since I discovered a spectrum analyzer software I think this instruments is the key to all kind of investigation.
I would love to have the opportunity to play with one.
I understand the good one are very expensive.
Thanks a lot again.
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Old 4th July 2016, 08:56 AM   #17
DF96 is offline DF96  England
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Quote:
Originally Posted by ginetto61
My opinion is that lab instruments are very important because if I do not see problems using the instruments I will not hear problems.
Because there are no problems.
If you can genuinely hear it then it is genuinely there. This does not guarantee that you will see it using instruments; it does guarantee that it is there to be seen by using the right instrument in the right way and interpreting the results in the right way.
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Old 4th July 2016, 09:08 AM   #18
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If you can genuinely hear it then it is genuinely there. This does not guarantee that you will see it using instruments;
it does guarantee that it is there to be seen by using the right instrument in the right way and interpreting the results in the right way
Hi and I see your point.
But the last check I had of my ears has left me confused
I am 55, the result was ok for my age but not exceptional. Average.
This means that I have not been able to hear a lot of high Hz signals.
And maybe some lower ones (I did not get the complete lab report, unfortunately ).
So I tend to trust instruments a lot.
Noise is quite easy to spot with instruments, if it is not minimal of course but in that case it will be hardly an issue.
For instance I can see very easily noise floors of about -100 dB with most of the usb soundcards, even cheap ones. So it is not a problem.
Distortion and the way to measure it for me is the key.
I have been exposed sometime to complete playback system with very low distortion ... the sound was spectacular.
Like looking through a clean glass. I could see/hear everything of the recording.
I still think that the ear can be replaced by instruments correctly used.
However I have the feeling that distortion measurements are not that easy to perform.
For instance they have almost disappeared from magazine reviews
I like them a lot.
I would replace my ear with a Spectrum analyzer with trust.
Thanks a lot again.
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Old 4th July 2016, 12:11 PM   #19
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Yes I could hear the noise on the audio.
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Old 4th July 2016, 06:35 PM   #20
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Quote:
Originally Posted by nigelwright7557 View Post
Yes I could hear the noise on the audio.
Hi ! yes i can believe that.
But i also believe you can also measure it in some way.
I am a little puzzled when i read that designers use instruments to check the performance of their prototypes but perform the final fine-tuning of them by ear
Maybe the real problem is to understand what to measure and how.
They can even measure resistors noise ...
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