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Juma's Easy-Peasy Capacitance Multiplier
Juma's Easy-Peasy Capacitance Multiplier
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Old 2nd January 2018, 04:49 PM   #331
xrk971 is offline xrk971  United States
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Juma's Easy-Peasy Capacitance Multiplier
I have the boards and they look great but missing IRFP9240 at the moment. Will need to order some. It may be the perfect solution that could replace the typical qnty 8 x 33mF 25V caps in a Class A CRC supply. That's about $35 savings for least expensive CDE brand.
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Old 2nd January 2018, 06:32 PM   #332
prasi is online now prasi  India
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Quote:
Originally Posted by xrk971 View Post
I have the boards and they look great but missing IRFP9240 at the moment. Will need to order some. It may be the perfect solution that could replace the typical qnty 8 x 33mF 25V caps in a Class A CRC supply. That's about $35 savings for least expensive CDE brand.
ok great x, all the best for your build!
regards
Pasi
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Old 3rd January 2018, 04:56 PM   #333
twocents is offline twocents  South Africa
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A noob question. I would like to use the basic core cap Mx to feed ACAs running at 24V. I cannot seem to find a BOM. There are 3 resistors (10K, 220 and 1.5 Ohm). What should their safe Watt ratings be?
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Old 21st January 2018, 02:46 AM   #334
prasi is online now prasi  India
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A noob question. I would like to use the basic core cap Mx to feed ACAs running at 24V. I cannot seem to find a BOM. There are 3 resistors (10K, 220 and 1.5 Ohm). What should their safe Watt ratings be?
All 1/4W would be safe. On my PCB, you could fit 1/2W or Vishay RN60D resistors.
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Old 21st January 2018, 06:53 PM   #335
schillg11 is offline schillg11  Germany
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Hi prasi,

are there any hints to run this board with +/- 45 V DC?

Ok, the values of the caps have to be adapated. Here actually from 4700F down to 1800F/63V and 220F down to 150F/63V due to mechanical limitations in size. The whole board is feed by a 2x 30000F 63V capacitor bank.
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Old 21st January 2018, 07:19 PM   #336
xrk971 is offline xrk971  United States
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You can run 50v caps on 45v rails. The 4700uF output caps can be made smaller especially if you use this to feed a smaller value CRC to really clean it up. I would try to use 220uF 50v caps if you can fit them. But 150uF is fine too.
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Old 21st January 2018, 08:37 PM   #337
schillg11 is offline schillg11  Germany
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Thanks X,

there was a little typo, i mean 54V DC for a Class A/B amp (Iq~ 300mA) , but i think it will be ok with the Capacitors.

BR
Gnni
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Old 21st January 2018, 09:44 PM   #338
xrk971 is offline xrk971  United States
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Oh, then use the 63v. You don't want a fireworks display. For those who have not see what happens when you apply 35v to a 16v 220uF cap... you don't want to. It can take out an eye.
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Old 22nd January 2018, 04:16 AM   #339
Vunce is offline Vunce  United States
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Im wondering if this cap Mx might be the solution to an amplifier hum?
I have a Forte Model 6 amp that I decided to re-cap because of its age and a slight power supply hum. While I had it apart, I figured this was the perfect time to rewire the transformer to convert my Model 6 (class ab) to a Model 4 (class a) and adjust bias.
When put back together and fired up, the same hum was still present!
I also noticed the transformer itself emitted a mechanical hum/buzz. I disconnected the original trafo from the bridge rectifiers and wired up a different transformer outside of the original chassis to bypass the original trafo. This time, when turned on the hum was gone! So, my plan was to remove the trafo from the enclosure and make a separate power supply chassis. At that point I kind of lost interest and put the project on hold.

Back to Jumas Easy Peasy, now Im thinking I could remove the huge capacitors, install this cap Mx and a new trafo all in the original enclosure and keep it as a single enclosure unit instead of having a separate enclosure for the power supply.
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Old 22nd January 2018, 05:32 AM   #340
xrk971 is offline xrk971  United States
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It will knock down the hum by -50dB (pretty much inaudible). However, if hum is caused by ground loop, or EMI pickup, it will not help. That was my problem with my M2. You can also use SMPS and DC step up boost to get around the hum as well.
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