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Juma's Easy-Peasy Capacitance Multiplier
Juma's Easy-Peasy Capacitance Multiplier
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Old 13th February 2018, 12:56 PM   #371
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
22mm and 25mm 6800u50V caps available
6800 uF 50 VDC Aluminium Electrolytic Capacitors - Leaded | Mouser India

with these it would be 20400uF+R+20400uF per side.
To x,
I have kept 3W/5W resistor on bottom side of PCB. This would need the resistor to be mounted at some distance from PCB as well as cabinet.
This in turn would mean using longer mounting spacers say 15mm.

dia of TH CRC resistor 6mm+ distance from PCB bottom 4mm+ distance from cabinet/chassis 4mm= 14mm.

Or better option is to use SMD 2512 1ohm 1W resistor, giving a total of 6W dissipation capability with equivalent resistance of 0.167ohm.

regarding your comment on connection of ground on output side, if there is an upstream Juma CM whose grounds are connected towards the output. How would that affect the working. would it make a loop between CM and CRC ?

1st image is the view from top
2nd image is the view from bottom.
Attached Images
File Type: png bulk+crc_prasi layout_top.png (100.0 KB, 353 views)
File Type: png bulk+crc_prasi layout_bottom.png (64.1 KB, 349 views)
File Type: png bulk+crc_prasi sch.png (16.3 KB, 341 views)
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Last edited by prasi; 13th February 2018 at 01:05 PM.
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Old 13th February 2018, 01:27 PM   #372
xrk971 is offline xrk971  United States
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Nice work Prasi!

I like the SMT option - I have done that with a bunch of 0805’s in my amps for source resistors.

Let’s keep the grounds separate with provision for jumpers at either end to be provided by user depending on situation and appearance of ground loops.
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Old 13th February 2018, 03:23 PM   #373
prasi is offline prasi  India
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Quote:
Originally Posted by Juntuin View Post
Thanks Prasi, you are kind I tried to collect some things, let's imagine 42v after rectifiers for example. Is there something really wrong?

(Led's are missing, spade connectors are too "thin" and you probs want to buy more IRFP's to match nice pairs?)

Mouser Electronics, Inc. Finland

Going to get eBay tester also, easier to match everything.
ok, here you go. Hope this works

"
When you are ready to access your project again you can do so by using either of the following 2 methods:

1. Save the link listed below and enter that link into your web browser at anytime.

Mouser Electronics

2. Go to our Project and Basket Sharing page and enter your project Access Number listed below where you see Enter Your Access ID.

Enter Access ID: 46e41f83dc

"

For the 4700uF caps, I have chosen Wruth electronics part. If you feel its costly, choose anything thats 50V rated and 18mm dia x 7.5 mm pitch.

Also I had entered parts name designations against each components. But Mouser seems to be deleting the name designations..Funny
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Last edited by prasi; 13th February 2018 at 03:29 PM.
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Old 13th February 2018, 04:29 PM   #374
Juntuin is offline Juntuin  Finland
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Quote:
Originally Posted by prasi View Post
ok, here you go. Hope this works

"
When you are ready to access your project again you can do so by using either of the following 2 methods:

1. Save the link listed below and enter that link into your web browser at anytime.

Mouser Electronics

2. Go to our Project and Basket Sharing page and enter your project Access Number listed below where you see Enter Your Access ID.

Enter Access ID: 46e41f83dc

"

For the 4700uF caps, I have chosen Wruth electronics part. If you feel its costly, choose anything thats 50V rated and 18mm dia x 7.5 mm pitch.

Also I had entered parts name designations against each components. But Mouser seems to be deleting the name designations..Funny
Thank you very very much can't complain the caps price tags, I think they are decently priced.
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Old 13th February 2018, 05:33 PM   #375
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
Quote:
Originally Posted by Juntuin View Post
Thank you very very much can't complain the caps price tags, I think they are decently priced.
My pleasure! and all the best for the build. please post your build here. It will motivate others for an affordable and easy peasy Juma CM for prospective amp builders.

To others,
Gerbers posted already, however someone not so comfortable with PCB manufacturing and ordering process, I can supply PCB or I can help with ordering process (As I have already done so for a couple of gentleman).

regards
Prasi
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Old 13th February 2018, 06:29 PM   #376
Juntuin is offline Juntuin  Finland
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Quote:
Originally Posted by prasi View Post
My pleasure! and all the best for the build. please post your build here. It will motivate others for an affordable and easy peasy Juma CM for prospective amp builders.

To others,
Gerbers posted already, however someone not so comfortable with PCB manufacturing and ordering process, I can supply PCB or I can help with ordering process (As I have already done so for a couple of gentleman).

regards
Prasi
Thanks, I will!

PCB ordering was surprisingly easy, couple of clicks and you're done with faster delivery PCB's came actually really fast, with reasonable cost.
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Old 14th February 2018, 01:00 AM   #377
Vunce is offline Vunce  United States
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Hi Prasi,


I ordered IRFP9140 Mosfets that were labeled on the schematic, but I see on your BOM you listed IRFP9240 Mosfets.
Are the IRFP9140's OK? Do I have to replace them with IRFP9240's?


Thanks,
Vunce
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Old 14th February 2018, 01:12 AM   #378
prasi is offline prasi  India
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Quote:
Originally Posted by Vunce View Post
Hi Prasi,


I ordered IRFP9140 Mosfets that were labeled on the schematic, but I see on your BOM you listed IRFP9240 Mosfets.
Are the IRFP9140's OK? Do I have to replace them with IRFP9240's?


Thanks,
Vunce
Hi Vunce,
9140 are fine, no problems. like x said before in post #367 "match identical Vgs on same sex if you can to get same voltage on both channels"
regards
Prasi
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Old 14th February 2018, 01:16 AM   #379
Vunce is offline Vunce  United States
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Great! That's a relief.
Yes, I will match them.


Thanks
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Old 14th February 2018, 01:23 AM   #380
xrk971 is offline xrk971  United States
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So you are going to make something like this then??
Click the image to open in full size.

I’m gonna strip out the linear PSU in my ALPHA20 and put the SMPS and cap mx in tonight. Let’s see if it can handle 1.3amps and 28v or 24v and 2amps?
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