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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: contact suppressor for schotty/Hexfred posted by Pat Wen on July 22, 2000 at 22:07:13:
Pat Wen wrote:I know that people usually connact a small cap (0.1uF?) across the schotty/Hexfred to improve their rectifying performance.
I am wonder the to get a better result, a contact suppressor should be used which usually made up of a 0.1uF capacitor in series with a 100ohm resister.Please let me know if this is ture?
It's true. In fact, that's the proper way to do it. Using just a capacitor can lower the resonant frequency, but it does next to nothing to actually damp the resonance which is the goal. However if you're using soft-recovery HEXFREDs, there's really no reason to use a snubbing network at all since they don't have the resonance problems that a snubber network addresses and may actually create a problem where none existed to begin with. But then creating problems can be perceived as an improvement (such as the TDS "enhancer") so don't let that stop you from trying it anyway.
If so, what cap and resister values should I use? (bear in mind that we want the best performance at very low freq --50/60HZ)
What you want to do is damp the resonance which is well above 50/60 Hz. In fact it's usually well above the audio range. The ideal values depend on the particular characteristics of the power supply you plan to use them with, particularly the leakage inductance of the power supply's secondary windings.
Jim Hagerman wrote a very good piece on optimum snubber networks in Audio Electronics (Issue One, 1998).
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Follow Ups
- Re: contact suppressor for schotty/Hexfred - Steve Eddy 00:51:56 07/23/00 (0)
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