Reducing noise in voltage regulators - Page 7

HarryHaller · 28th August 2002, 12:47 AM

Jung type op amp regulator with different decoupling scheme, improved current source, and ZVP3310 mosfet driving Toshiba C3298 pass transistor. Waiting for AD8610 and OPA627 op amps for testing. Built on protoboard with top layer group plane. Weird parts layout for short signal path.

Peter Daniel · 28th August 2002, 01:27 AM

Those new boards of yours look way better indeed.

HarryHaller · 28th August 2002, 01:49 AM

I know it's homely, don't rub it in. This is a quicky test circuit board all was built for speed (and with speed) not looks. I hope to have it running tommorow.

ALW · 30th August 2002, 10:52 PM

Where do you get that ground plane proto board?

Could be useful for quick'n'dirty tests.

Andy.

P.S. Tested AD825 op-amps tonight, they are the dog's danglies in my preamp supply. They trade ultimate impedance and noise (realtive to AD797) for flatter impedance curve and better bandwidth, and sound much better to me. Musical whole just 'gels' better, more of a band, less a recording.

ALW · 7th September 2002, 09:47 AM

Just for Harry, here's a pic of the new boards, on the test rig.

AD817 fitted for quick test purposes, AD825 provision is underneath.

Zetex transistors are substituted for the 2N2907's, in accordance with Jocko's new law

(and giving better performance)

Enjoy...

janneman · 7th September 2002, 09:57 AM

Hi Andy,

Looks pretty neat! Any measurement results yet?

Jan Didden

HarryHaller · 7th September 2002, 11:13 AM

WAY COOL!!!!!!! Very nice layout. Standard Jung design with 317 preregulator?

H.H.

ALW · 7th September 2002, 11:13 AM

Jan,

None yet, I only built them this morning. Currently on burn-in and will measure noise tomorrow, hopefully.

Other results may take a little longer, I'm currently re-designing the impedance / line rejection jig.

Sonic evaluation of the first two I built, now nicely run-in are marvellous - I love the AD825, wish I could source some AD8610's, they model well. My sample request hasn't arrived

Regards,

A.

P.S. Did you ever get my email? - I never received anything back from you.

ALW · 7th September 2002, 11:20 AM

You'll make me blush

Quote:

WAY COOL!!!!!!! Very nice layout. Standard Jung design with 317 preregulator?

Essentially, but using different components. Caps are Rubycon ZA, there's additional decoupling to the op-amp (Nichicon PL) and the feedback low-pass network (when used) is differently configured from Walt's recommendation, because it didn't work for me.

Resistors are Beyschlag and the level-shift zener is a beefier 5W part too, but that was mainly an availability issue, it doesn't need to be this big.

Apart from that it's the same...

A.

HarryHaller · 7th September 2002, 11:51 AM

Don't be modest. I love the 45 degree orientation for the small transistors. How about photo of the bottom side. Great part choices, the Rubycon ZAs are new and simular to the Sanyo oscons I think. Very nice job. There are several oscon ( Organic SemiCONductor type caps on the market now.

http://www.low-esr.com/compare.html-ssi

http://www.vishay.com/products/capacitors/aluminum.html

http://www.sanyo.com/industrial/comp...scon_home.html

http://www.rubycon.co.jp/english/prodct/new2.htm

http://www.chemi-con.com/mapresults.php?series=fa

http://www.panasonic.com/industrial/...ef_xr_1201.pdf

28th August 2002, 01:27 AM	#62
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	Those new boards of yours look way better indeed. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

28th August 2002, 01:49 AM	#63
HarryHaller Banned Join Date: Feb 2002 Location: Dallas,Texas	Those new boards of yours look way better indeed. I know it's homely, don't rub it in. This is a quicky test circuit board all was built for speed (and with speed) not looks. I hope to have it running tommorow.

30th August 2002, 10:52 PM	#64
ALW diyAudio Member Join Date: Jun 2001 Location: UK	Harry Where do you get that ground plane proto board? Could be useful for quick'n'dirty tests. Andy. P.S. Tested AD825 op-amps tonight, they are the dog's danglies in my preamp supply. They trade ultimate impedance and noise (realtive to AD797) for flatter impedance curve and better bandwidth, and sound much better to me. Musical whole just 'gels' better, more of a band, less a recording.

7th September 2002, 09:57 AM	#66
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	volt reg Hi Andy, Looks pretty neat! Any measurement results yet? Jan Didden

7th September 2002, 11:13 AM	#67
HarryHaller Banned Join Date: Feb 2002 Location: Dallas,Texas	Just for Harry WAY COOL!!!!!!! Very nice layout. Standard Jung design with 317 preregulator? H.H.


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7th September 2002, 11:13 AM	#68
ALW diyAudio Member Join Date: Jun 2001 Location: UK	Measurements Jan, None yet, I only built them this morning. Currently on burn-in and will measure noise tomorrow, hopefully. Other results may take a little longer, I'm currently re-designing the impedance / line rejection jig. Sonic evaluation of the first two I built, now nicely run-in are marvellous - I love the AD825, wish I could source some AD8610's, they model well. My sample request hasn't arrived Regards, A. P.S. Did you ever get my email? - I never received anything back from you.

7th September 2002, 11:51 AM	#70
HarryHaller Banned Join Date: Feb 2002 Location: Dallas,Texas	You'll make me blush Don't be modest. I love the 45 degree orientation for the small transistors. How about photo of the bottom side. Great part choices, the Rubycon ZAs are new and simular to the Sanyo oscons I think. Very nice job. There are several oscon ( Organic SemiCONductor type caps on the market now. http://www.low-esr.com/compare.html-ssi http://www.vishay.com/products/capacitors/aluminum.html http://www.sanyo.com/industrial/comp...scon_home.html http://www.rubycon.co.jp/english/prodct/new2.htm http://www.chemi-con.com/mapresults.php?series=fa http://www.panasonic.com/industrial/...ef_xr_1201.pdf

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