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Keantoken's CFP cap multiplier
Keantoken's CFP cap multiplier
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Old 16th May 2017, 11:27 AM   #991
Michael Mik is offline Michael Mik  Germany
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Well, but I do not find C5 in the above mentioned schematic. Mmmhhhh
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Old 16th May 2017, 11:32 AM   #992
keantoken is offline keantoken  United States
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I meant C5 on the PCB.
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Old 16th August 2017, 11:19 AM   #993
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
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Originally Posted by keantoken View Post
I still doubt Rbb is an issue (but if it is we'll figure it out).

Hfe for Q1 and Q3 should be at least 200 or higher preferably. If it is high enough, we can change R2 to 10k for better bass (if that's even necessary)...

- keantoken
Can i do this in the high voltage version ?
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Old 16th August 2017, 11:59 AM   #994
keantoken is offline keantoken  United States
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No, sorry. I usually set the values as high as I can anyways.
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Old 16th August 2017, 03:33 PM   #995
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
Thank you Kean

I am planning to use the high voltage version as ripple killer for the front end of my power amp.

It will feed the IPS and VAS because I am not sure if it can also be used to feed the driver stage.

The IPS plus VAS run at 16mA so I added a shunt resistor in the output of the kmult just to increase current pull to 40mA.... Is there a better way to do it ?
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Old 16th August 2017, 03:39 PM   #996
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
My sim:
Attached Files
File Type: txt MYamp.txt (58.5 KB, 23 views)
File Type: asc P300 EVO34 Kmult SQUARE 25khz.asc (31.6 KB, 17 views)
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Old 16th August 2017, 04:44 PM   #997
keantoken is offline keantoken  United States
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I think that should be fine. For this amp there should be no problem running the drivers from the KM.
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Old 16th August 2017, 05:24 PM   #998
RCruz is offline RCruz  Switzerland
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Keantoken's CFP cap multiplier
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Originally Posted by keantoken View Post
I think that should be fine. For this amp there should be no problem running the drivers from the KM.
Thank you Kean

Would you elaborate on this ?

Why, in this amp you state there should be no problem feeding the drivers with the KM ?

Are there any issues if I try to use the KM feeding the drivers of a differnt kind of power amp ? Example, would it be suitable even if the output stage was not made with laterals ?
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Old 16th August 2017, 06:19 PM   #999
keantoken is offline keantoken  United States
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The drivers are not really loaded by MOSFET gates, so there will not be much current demanded from the KMs. For a BJT output amp the situation could be different.
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Old 16th August 2017, 06:29 PM   #1000
RCruz is offline RCruz  Switzerland
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So even with the need to charge the mosfets input capacitance there should be no issues.

I will see if I can introduce these mods on my layout.
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