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Old 29th March 2012, 09:27 AM   #31
AndrewT is offline AndrewT  Scotland
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Who developed a few variations?
Some gave much improved performance compared to the basic.
Keantoken?

4Vpp to 0.2mVpp is 86dB of hum attenuation.
It will be slightly better for the lower mains harmonics.
Spike performance will not be as good.
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Last edited by AndrewT; 29th March 2012 at 09:29 AM.
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Old 29th March 2012, 11:12 AM   #32
GregH2 is offline GregH2  Australia
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AndrewT, do you think adding a larger final cap to the multiplier will improve the spike performance?

This is the amplifier circuit I am contemplating as a final design. I think I'll stick to one pair, or maybe 3x output fets, since the cap will block any dc.
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Old 29th March 2012, 11:25 AM   #33
AndrewT is offline AndrewT  Scotland
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I have little idea.
Any esl in a capacitor here will certainly influence the HF output impedance.

I would be more inclined to trap spikes nearer the input.

And decouple nearer the current client.
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Old 29th March 2012, 01:04 PM   #34
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Current through pots R8,9 and R33,34 ? think about using fixed value resistors with suitable wattage.



Cheers / Chris
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Old 29th March 2012, 03:57 PM   #35
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Cap multiplier ( in this example dual rail ) discussed here:
Capacitance Multiplier Power Supply Filter

Cheers / Chris
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Old 30th March 2012, 03:04 AM   #36
GregH2 is offline GregH2  Australia
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Quote:
Originally Posted by Chris Daly View Post
Current through pots R8,9 and R33,34 ? think about using fixed value resistors with suitable wattage.



Cheers / Chris
Not too worried about this, it's only a milliamp or so.

Thanks for the link - good article.
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