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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 18th April 2014, 12:10 AM   #641
keantoken is offline keantoken  United States
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The 45V+ version is no different in its output impedance than the original version.

The Kmultiplier's output impedance is comparable to that of large electrolytics. This basically means that if you put a 1000-2200uF lytic at the output, supply impedance will be halved. Another and it will be cut in third. So, wherever you want to end up, let this be your guide. Any lytic smaller than 470u probably won't have much of an effect unless it is closer to the circuit than the KM. A large film cap however will have low enough ESR to be an improvement in the ultrasonic range.
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Old 18th April 2014, 12:15 AM   #642
buzzforb is offline buzzforb  United States
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I am doing the tube version, so B+ of 340.
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Old 18th April 2014, 12:39 AM   #643
keantoken is offline keantoken  United States
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Both the lytic and film cap will probably be helpful for the tube version. If I went with just one I would use the film cap.
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Old 18th April 2014, 12:59 AM   #644
buzzforb is offline buzzforb  United States
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I was considering this versus the Salas shunt for no other reason than cost and total junctions, but with the caps, the cost is higher. I am still curious if I will like it more, as the there are less transistors involved in the signal. Simple minded, i know, but just a theory.
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Old 18th April 2014, 03:14 AM   #645
keantoken is offline keantoken  United States
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I can't say either way. But if you build the KM first to find out, you'll have them available when you use the shunts. In any case I'm curious what your result would be.
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Old 18th April 2014, 05:56 AM   #646
triode_al is offline triode_al  Netherlands
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Quote:
Originally Posted by AndrewT View Post
60mm is longer than my thumb.
That puts 200mm in as a long dimension.

0.5nH to 1nH per millimetre of trace/wire adds up very quickly to raised HF impedance.
That is a new formulation of a Rule of Thumb
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Old 18th April 2014, 08:14 AM   #647
AndrewT is offline AndrewT  Scotland
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That took a while, but you got there.

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Old 18th April 2014, 02:12 PM   #648
buzzforb is offline buzzforb  United States
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Kean,
Could you walk through the forumula for figuring the Zo of the K multiplier if it will be supplying a B+of 340mV@20mA. I have tried using the explanation on the site, but I am misunderstanding something, it seems.

For instance,
"Q1 is biased into it's most linear range by R1. So Ic(Q1) is roughly .68/47=~15mA. This is a bit low to accommodate for a nominal max of 5mA Ib(Q2)."

Is there conflict in this statement? Its 15mA, but a bit low for nominal 5mA for q2 base?
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Old 20th April 2014, 11:33 PM   #649
Triodethom is offline Triodethom  United States
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Quote:
Originally Posted by triode_al View Post
That is a new formulation of a Rule of Thumb
Rule of thumb was refering to width I believe about 25mm or 1inch approx. Still it adds up fast at higher freq.s .
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Old 21st April 2014, 08:02 PM   #650
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
Been using Kmult behind Salas BiBs in my headphone amp with great results for a long time now. Sound is more uniform without harshness but keeping all the detail and "byte".

Tried to use the same behind FdW shunts on the paradise and got bad sounding high frequencies. seemed like distortion. Scoped it and found that I had ultra high freq modulations.... oscilations maybe.

Now I am experimenting it behind Salas folded and it works very well.... ripple comes down from 360mv to 80mv just before entering the shunts and I hear no distortions at all. Can not give a good subjective listening impression because I only have one channel running with the kmult.

Will now build another one and report the results latter.
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