PO89ZB , an inline DC filter for SMPS wall warts . Preamps, HPA, Korg NuTube, etc - Page 25

bohrok2610 · 13th December 2020, 06:25 PM

Quote:

Originally Posted by jan.didden

Maybe people like Würth have spice models for their inductors. I'll see if I can find something.

Jan

There are loads of models of similar inductors in LTSpice from various manufacturers including Bourns. However the exact inductor model used here is not among those.

Mark Johnson · 13th December 2020, 06:33 PM

Literally everything you need to make an accurate-enough-for-diyAudio SPICE model of the Bourns inductor, is printed on the schematic attached to post #1 of this thread. It's . all . right . there . And it has been there since May.

If your reaction is along the lines of, "I still don't get it," then read the tutorial pages linked in post #9.

bohrok2610 · 13th December 2020, 06:54 PM

Quote:

Originally Posted by Mark Johnson

Literally everything you need to make an accurate-enough-for-diyAudio SPICE model of the Bourns inductor, is printed on the schematic attached to post #1 of this thread. It's . all . right . there . And it has been there since May.

If your reaction is along the lines of, "I still don't get it," then read the tutorial pages linked in post #9.

You probably misunderstood my comment. I do not have any problems with finding a suitable inductor model in LTSpice. I just noted that this particular inductor is for some unknown reason not included in the huge inductor database.

ClaudeG · 13th December 2020, 09:01 PM

Sorry for the confusion Joesnd, meant the reply from Mark to my post re possible coils, not at all your post and questions of course

docjrev · 19th December 2020, 01:51 PM

Hello,
Anyone with have an extra board or two? I have an ACP+ running on an SMPS supply and very interested in trying this. Please PM me. Thanks. Godspeed.

SuppersReady · 26th December 2020, 06:47 PM

I'll be doing another order of 30 of the PO89ZB filter boards for anyone who wants them. As before I'm only asking for the price of the postage.

When I get a moment spare, I'll pm the several people who have already asked for some recently.

SuppersReady · 28th December 2020, 06:49 AM

I played with the quantities to order on the JLCPCB site and a curious outcome occured. If I ordered 30 boards, the price was approximately £5.00 + shipping. If I ordered 50 boards, the price jumped to £20 + shipping. I didn't appreciate the jump in price, so I looked at what would happen if I ordered two lots of 30 boards on the same order. The result was 60 boards for £10 + shipping!

So I ordered 60 boards.

I figured that since there were several people who enquired after the last batch had gone that I would probably have a similar situation this time, so why not have spares.

They took less than two weeks to arrive last time. Anyone who is interested in some boards, just let me know.

SuppersReady · 28th December 2020, 07:21 AM

It's a good thing that I ordered 60. 26 are reserved already!

Best be quick!

joensd · 28th December 2020, 08:09 AM

I'd happily take up to 6 boards, if that isn't too much already.
I'd also be willing to "send them on" if there's any other takers in Germany. Less work for you mate. Thanks a heap!

JohnnoG · 28th December 2020, 08:37 AM

I had one the PCB's passed on to a friend who has a Korg B1.
There are Five Korg B1's within a local HiFi Group, so the idea was to get a broad assessment, across the Variants of the KB1 Builds.

The PCB is now assembled and attached a Korg B1.

The report from the PCB assembler on the initial usage is that there are improvements that are attractors, a noticeable improvement to detail and imaging with a increase in the Bass Attack.
The personal assessment is that as a device it will missed when not in use.
I assume that after a loan to other local Korg B1 Owners, it will be remaining within the system.

26th December 2020, 06:47 PM	#246
SuppersReady diyAudio Member Join Date: Oct 2002 Location: UK	I'll be doing another order of 30 of the PO89ZB filter boards for anyone who wants them. As before I'm only asking for the price of the postage. When I get a moment spare, I'll pm the several people who have already asked for some recently. __________________ A poor life this if, full of care We have no time to stand and stare.

28th December 2020, 06:49 AM	#247
SuppersReady diyAudio Member Join Date: Oct 2002 Location: UK	I played with the quantities to order on the JLCPCB site and a curious outcome occured. If I ordered 30 boards, the price was approximately £5.00 + shipping. If I ordered 50 boards, the price jumped to £20 + shipping. I didn't appreciate the jump in price, so I looked at what would happen if I ordered two lots of 30 boards on the same order. The result was 60 boards for £10 + shipping! So I ordered 60 boards. I figured that since there were several people who enquired after the last batch had gone that I would probably have a similar situation this time, so why not have spares. They took less than two weeks to arrive last time. Anyone who is interested in some boards, just let me know. __________________ A poor life this if, full of care We have no time to stand and stare.

28th December 2020, 07:21 AM	#248
SuppersReady diyAudio Member Join Date: Oct 2002 Location: UK	It's a good thing that I ordered 60. 26 are reserved already! Best be quick! __________________ A poor life this if, full of care We have no time to stand and stare.

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13th December 2020, 06:33 PM	#242
Mark Johnson diyAudio Donor diyAudio Member Join Date: May 2011 Location: Silicon Valley	Literally everything you need to make an accurate-enough-for-diyAudio SPICE model of the Bourns inductor, is printed on the schematic attached to post #1 of this thread. It's . all . right . there . And it has been there since May. If your reaction is along the lines of, "I still don't get it," then read the tutorial pages linked in post #9.

13th December 2020, 09:01 PM	#244
ClaudeG diyAudio Member Join Date: Jan 2015	Sorry for the confusion Joesnd, meant the reply from Mark to my post re possible coils, not at all your post and questions of course

19th December 2020, 01:51 PM	#245
docjrev diyAudio Member Join Date: Sep 2018 Location: Rancho Cucamonga, CA.	Hello, Anyone with have an extra board or two? I have an ACP+ running on an SMPS supply and very interested in trying this. Please PM me. Thanks. Godspeed.

28th December 2020, 08:09 AM	#249
joensd diyAudio Member Join Date: Dec 2001 Location: Germany	I'd happily take up to 6 boards, if that isn't too much already. I'd also be willing to "send them on" if there's any other takers in Germany. Less work for you mate. Thanks a heap!

28th December 2020, 08:37 AM	#250
JohnnoG diyAudio Member Join Date: Jan 2019	I had one the PCB's passed on to a friend who has a Korg B1. There are Five Korg B1's within a local HiFi Group, so the idea was to get a broad assessment, across the Variants of the KB1 Builds. The PCB is now assembled and attached a Korg B1. The report from the PCB assembler on the initial usage is that there are improvements that are attractors, a noticeable improvement to detail and imaging with a increase in the Bass Attack. The personal assessment is that as a device it will missed when not in use. I assume that after a loan to other local Korg B1 Owners, it will be remaining within the system.