Juma's Easy-Peasy Capacitance Multiplier

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#841
kozard said:
I just loaded the Gerber files in the KiCad gerber viewer and it does appear that the board is smaller than what JLCPCB is detecting. The output transistors along with two drill holes appear as part of the PCB area and then the PCB outline.

Any chance that the originator can upload a fixed version with the correct PCB outline in the edge cuts?


Edit: I have attached an image of the errors in the outline layer where you can see the outline extending beyond the PCB dimensions.
Click to expand...

Hi Kozard,
here is modded gerber zip file that doesnt have drill for output which might be causing wrong outline with jlcpcb.
hopefully it will work now.
regards
prasi
 

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#842
Yes, that works. Thank you!

JLCPCB detects the size/outline correctly now. (Image attached.)
 

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  • M Johnson CM JLCPCB.png
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#843
Would it be a good idea to run this circuit with to92 mosfets for powering opamps close to their pins, post regulator l, lets say 317/337, where the layout forces the traces to be longer than optimal? With the opamps small current dra the cmx's heat will be also low.
 
#849
gtose said:
Prasi, your mastery of PCB layout has inspired v2 of my design. I have attempted to move "all the action" to the output ground connection.

The grounds of C3, C4, R3, R4 have been moved to their own ground plane. The grounds of C1, C2, R1 are run to the output in their own planes (top and bottom). The two only connect at the output faston and surrounding vias.

What do you think?
Click to expand...

hi, are there any published gerber files of your multiplier? thanks and good job!
 
#853
prasi said:
Thank you Mark for your suggestions.
As per the Juma's schematic , the values are 12k Ohm for the R2 and R6.

Also requires a regulated input for the circuit , so the on-board rectifiers + CRC may not be such a good idea.

Regards
Prasi
Click to expand...


Hi Prasi, I wanted to ask you if there are gerber files or a specific 3d about these 2 of your pcbs. Thank's for your job. Good day!


 
#854
thimios said:
We are too lucky that we have you here Prasi!
You are a very generous gentleman.
Best Regards.
Thimios.
Click to expand...
My thoughts exactly! :up: A high class gentleman!

What I wanted to add to this is that I really appreciate collaboration of xrk971, Mark Johnson, Gtose, Juma and others who contributed to this refined and revealing conversation.

I am using Capacitance Multiplier board created here and is available for purchase at pcbway.com. I intend to use Capacitance Multiplier with every amplifier I will ever build. Somewhere I have read that amplifier just modulates power provided from the power supply. I tend to agree with that even though that isn't entirely true. The truth is that a good power supply may make a great amplifier even much greater. And vice-versa: inadequate power supply may totally degrade the sound of otherwise good amplifier.

Thanks guys!🙂 :up:
 
#857
TasoTaso said:
Hi Prasi, I wanted to ask you if there are gerber files or a specific 3d about these 2 of your pcbs. Thank's for your job. Good day!

https://ibb.co/x202JYQ
https://ibb.co/LZvdcXz
Click to expand...

Hi Taso,
Here is gerbers file for second design. I cant find the other design.
also sch and layout.
I dont think anyone has tested this particular pcb design

regards
prasi
 

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#858
TasoTaso said:
Hi, one question:
For this pcb/schematic, if i put all 4 mosfet identical, like irf840 or similar, can i have 4 multiplier for positive voltage?
I have to disconnect/separate the gnd connection?

https://ibb.co/yFQ6hhG

Thanks guys
Click to expand...

It will not work as diode orientation is different. best not to try it.
rather you can cut pcb in half and use.
 
#859

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