Mpp - Page 750

Holger Barske · 6th October 2012, 12:49 AM

Quote:

Originally Posted by Algar_emi

Hi. Since the official R3 PCB was no longer available, I did my own

This looks like transformer - choke - rectifier - cap,

Guys. This isn't what we talked about. We want transformer - rectifier - cap - choke - cap.

Algar_emi · 6th October 2012, 02:09 AM

Joachim you have mail

Joachim Gerhard · 6th October 2012, 02:22 AM

Holger, Algar designed the pre regulator for the pre regulator so to say. I posted in 7490 that i will add chokes and caps.

Joachim Gerhard · 6th October 2012, 02:25 AM

I think the use of the common mode chokes is correct in this design but for ripple rejection we need the bigger sized stuff from Hammond or Lundahl. Those can be put behind Algars
PCB or could be integrated in a bigger PCB.

Bksabath · 08:11 AM

Quote:

Originally Posted by Holger Barske

This looks like transformer - choke - rectifier - cap,

Guys. This isn't what we talked about. We want transformer - rectifier - cap - choke - cap.

Wasit not traffo - common mode coke - rectifier - cap - coke - cap ?

kamis · 6th October 2012, 08:16 AM

Quote:

Originally Posted by Bksabath

Wasit not traffo - common mode coke - rectifier - cap - coke - cap ?

Why not use John Curl topology? He attached it in another thread.

Joachim Gerhard · 6th October 2012, 11:32 AM

The common mode chokes suppress only HF/RF. For ripple rejection and smoothing we need big coils that work in the audio range.

MiiB · 12:43 PM

To me theres no need to target ripple rejection.. HF is the primary.....

The Paradise has extreme ripple rejection.... all is effective shielded by high impedance current-sources/mirrors. poison is the Hf, that can bleed through stray capacitance.
Curls schematic seems rather fine to me or at least a good start. ut no need for the LM's as the Shunt is already onboard..:9

Joachim Gerhard · 6th October 2012, 12:35 PM

I agree, there is no need for extreme pre regulation but it may be fun. Some may hear a difference, some not, one never knows.

Bksabath · 11:44 PM

Quote:

Originally Posted by kamis

Why not use John Curl topology? He attached it in another thread.

Sorry that to me is straight LM317 and a common mode coke classic straight out of book

Why do we have to put a name on it?

In other words....

Besides one may need to step back and see all the work FDW did on the suply before mentioning LM317

6th October 2012, 12:30 PM	#7498
MiiB diyAudio Member Join Date: May 2005 Location: Denmark	To me theres no need to target ripple rejection.. HF is the primary..... The Paradise has extreme ripple rejection.... all is effective shielded by high impedance current-sources/mirrors. poison is the Hf, that can bleed through stray capacitance. Curls schematic seems rather fine to me or at least a good start. ut no need for the LM's as the Shunt is already onboard..:9 __________________ http://www.linkedin.com/pub/michael-...esen/a/a55/544 http://www.raidho.dk/ Last edited by MiiB; 6th October 2012 at 12:43 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

6th October 2012, 02:09 AM	#7492
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	Joachim you have mail

6th October 2012, 02:22 AM	#7493
Joachim Gerhard diyAudio Member Join Date: Mar 2009	Holger, Algar designed the pre regulator for the pre regulator so to say. I posted in 7490 that i will add chokes and caps.

6th October 2012, 02:25 AM	#7494
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I think the use of the common mode chokes is correct in this design but for ripple rejection we need the bigger sized stuff from Hammond or Lundahl. Those can be put behind Algars PCB or could be integrated in a bigger PCB.

6th October 2012, 11:32 AM	#7497
Joachim Gerhard diyAudio Member Join Date: Mar 2009	The common mode chokes suppress only HF/RF. For ripple rejection and smoothing we need big coils that work in the audio range.

6th October 2012, 12:35 PM	#7499
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I agree, there is no need for extreme pre regulation but it may be fun. Some may hear a difference, some not, one never knows.