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-   -   Capacitance multiplicator in Alephs? (http://www.diyaudio.com/forums/pass-labs/93750-capacitance-multiplicator-alephs.html)

Lovan 8th January 2007 08:36 PM

Capacitance multiplicator in Alephs?
 
Hello

How come that noone is using a capacitance multiplicator in their powersupplies for the alephs? Not as a substitut for a big bank of capacitors but as a komplement.
The bride of zen uses one, ZenV3 has one, why not Alephs?

Cheers! :D

/Niclas

Nelson Pass 8th January 2007 09:12 PM

Works fine - just put some (preferably big) caps to ground after it.

:cool:

Lovan 8th January 2007 09:19 PM

Thank you Nelson I will try that :)

Vix 9th January 2007 11:34 AM

Quote:

Originally posted by Nelson Pass
Works fine - just put some (preferably big) caps to ground after it.

:cool:

Nelson, do you mean Big caps after the capacitance multiplier?Aren't they supposed to be before the cap multiplier? As I understood, usually there were some small capacitors (220uF elko bypassed by a 1uF film) after the capacitance multiplier (zen v3 and v4 for example). Why big caps now? Are they necessary in case of higher bias currents?

Regards,

Vix

GRollins 9th January 2007 02:25 PM

Capacitance multipliers are good at smoothing the DC, but not so good at responding to varying demands from the circuit. The capacitors after the capacitance multiplier are there to handle transients.

Grey

Lovan 9th January 2007 06:55 PM

How about a multiplicator and then a CRC? too much? :)

Zen Mod 9th January 2007 07:12 PM

Quote:

Originally posted by Lovan
How about a multiplicator and then a CRC? too much? :)

if you use multiplicator,you use it already instead of R.....
so you don't need it again

Manu 9th January 2007 07:27 PM

Which config would be the best for, lets say Aleph 5?
How much device to parallel to handle the required current? (refering to ZV3schematic)
Manuel

Nelson Pass 9th January 2007 08:07 PM

Actually you can get by with 1 device per rail, since the draw
of an Aleph 5 is about 2A per channel and using a Mosfet
for capacitance multiplier gives it a dissipation of about 4V X 2A
or 8 watts.

GRollins 9th January 2007 09:09 PM

We are DIY...there is no such thing as too much.
Or, to put it another way:
If some is good, then more is better, and too much is just enough!
I'm in the beginning stages of planning (yet another) tweeter amp. I'm flipping coins at this point, but the most likely configuration at this time is RCLC, followed by an optional capacitance multiplier or regulator, followed by--you guessed it--more C.

Grey


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