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Juma's Easy-Peasy Capacitance Multiplier
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Old 12th October 2017, 05:18 PM   #241
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
Thanks x, I will refine and use fastons.
Fastons when cleverly spaced and with proper footprint , can also accommodate screw terminal blocks.
I too have come to dislike cheap chinese and local termi blocks, but the ones from TE are simply superb (bucchanan series- 282857-5 TE Connectivity / Buchanan | Mouser India ) and very durable.
24 A /300V and 30AWG to 12AWG.

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Prasi
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Old 13th October 2017, 07:49 PM   #242
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
refined... with RN60 resistor footprint, + 2USD easyeda pcb compatible

heatsink for power diodes made from aluminium plate bent in shape shown.

regards
Prasi
Attached Images
File Type: png JUMA CM SCH.png (14.3 KB, 798 views)
File Type: png JUMA CM.png (100.4 KB, 1576 views)
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Last edited by prasi; 13th October 2017 at 08:06 PM.
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Old 13th October 2017, 08:08 PM   #243
tubesguy is offline tubesguy  United States
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Thanks, Prasi, I was just about to give in and use a switcher for my Pass M2, but this would work quite well, I'm sure, with the many linear supply parts I have sitting in the basement.

Will you be producing boards yourself, or do we need to supply the board house with the appropriate files?
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Old 13th October 2017, 08:12 PM   #244
prasi is offline prasi  India
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Juma's Easy-Peasy Capacitance Multiplier
Quote:
Originally Posted by tubesguy View Post
Thanks, Prasi, I was just about to give in and use a switcher for my Pass M2, but this would work quite well, I'm sure, with the many linear supply parts I have sitting in the basement.

Will you be producing boards yourself, or do we need to supply the board house with the appropriate files?
Hi tubesguy,
I will post all the gerbers files required for board manufacturing by boardhouses. you could order it yourself. 11 pcbs for 12 USD total @ easyeda.

Let me refine it a bit more, by tomorrow.

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Prasi
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Old 14th October 2017, 06:36 AM   #245
prasi is offline prasi  India
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gerbers/stuffing guide/ schemat..

with Reinforced traces and refined silk.

regards
Prasi
Attached Images
File Type: png JUMA CM.png (122.7 KB, 7307 views)
File Type: png JUMA CM SCH.png (14.3 KB, 785 views)
Attached Files
File Type: zip GERBERS-juma cap multi-R3.zip (216.1 KB, 174 views)
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Old 14th October 2017, 08:42 AM   #246
AndrewT is offline AndrewT  Scotland
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Four cap multipliers on one small PCB.
Well done !
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Old 14th October 2017, 10:57 AM   #247
prasi is offline prasi  India
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Quote:
Originally Posted by AndrewT View Post
Four cap multipliers on one small PCB.
Well done !
Thanks Andrew.

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Old 15th October 2017, 12:10 AM   #248
tubesguy is offline tubesguy  United States
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Thanks again, Prasi. Ordered boards this morning. I'm looking forward to getting this project completed.
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Old 15th October 2017, 12:16 AM   #249
xrk971 is offline xrk971  United States
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Juma's Easy-Peasy Capacitance Multiplier
Yes, thank you Prasi - this is going to be a very useful board to have. Fitting four onto a 100mm square is true art and huge cost savings for us to get fabricated at typical PCB maker where huge discounts for small 100mm exist.


Under Class A operation I am a little concerned about how much heat dissipation we would need on those TO220 diodes. Assuming 1.5amp working current, that's about 1w ea or nearly 8w total for all diodes on the dual bridge. One option is to use an external monolithic bridge (center bolt with 4 spades), in which case we could add some clever jumpers at the appropriate diode holes and connect the DC input to the AC spades. But for Class AB operation, the setup as is will be just fine.
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Last edited by xrk971; 15th October 2017 at 12:39 AM.
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Old 15th October 2017, 01:50 AM   #250
jwicaksana is offline jwicaksana  Indonesia
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Hello friends, greetings to all. Very nice layout prasi, and interesting discussion throughout the thread.
Sorry to take the discussion down to pre-school level, but I need your help for my project here. I am building a p2p CM for a TDA7297 amp, meaning, stereo and single rail power supply. The schematic on page 1 refers to dual mono dual rail power so I had to extrapolate a little bit.

Click the image to open in full size.

This far is no problem, but since I am illiterate in schematics, let me confirm a few things:
- DC+ from rectifier connects to the 10k resistor (that is in parallel with 1N400*) then connects to Drain in the MOSFET
- DC- from rectifier connects to negative lead of 220uF cap
- Positive lead of 4700uF cap connects to Source in MOSFET, also acting as DC+ output?
- Negative lead of 4700uF cap joins the negative lead of 220uF cap, effectively as common ground so DC- input (from rectifier) and output (to power amp) are also joined in the same spot?

Please advise, before I blow something ^^
Thanks so much, appreciate the handholding.
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