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

[CoGT3]

Of course you can measure it with a scope (and are unlikely to be disapointed)... and / or you could just listen to it, to find out if you hear any improvements and if so which ones

It is so easy to plug it in and out to listen to the difference...

Have fun and well done

Claude

Hopefully the ACA mini will be built, up, and running by the weekend. Listening tests will definitely take place with and without the filter. As someone very low on the learning curve of using my oscilloscope I’m always trying to find a reason to measure more than anything as a learning experience.

Bravo, @CoGT3! It takes bravery to order PCBs the first time, and more bravery to order components yourself in the current environment of perpetual shortages. Board looks good, congratulations.

Mark, Bravo to you and the rest of crew here who are so generous with your time, knowledge, and gentle nudges to step out of our comfort zones. Probably never would have ordered the Quasimodo boards alone but figured if I was ordering the filter boards why not. Transformer should be here in 2-3 weeks and I’ll give Quasimodo a try also.

 

[CoGT3]

SMPS finally in its new case with help from my daughter. We all know the secret sauce of the Pass amp boards is a blue LED (or green for ZM boards), but according to my daughter the SMPS needs a golden chicken to oversee function.

 

[Mark Johnson]

Spectacular!

 

[Halauhula]

Talk about thinking outside of the "same old, same old" box and putting into a innovative box. Congratulations to you and your daughter! Wonderful inspiration! I am inspired....

 

[CoGT3]

Talk about thinking outside of the "same old, same old" box and putting into a innovative box. Congratulations to you and your daughter! Wonderful inspiration! I am

If you are interested, here is the rest with its ACA mini.

https://www.diyaudio.com/community/threads/diy-aca-mini.379037/page-36#post-6972636

 

[Halauhula]

If you are interested, here is the rest with its ACA mini.

https://www.diyaudio.com/community/threads/diy-aca-mini.379037/page-36#post-6972636

Oh yeah!

 

[thomasnadeau]

SMPS finally in its new case with help from my daughter. We all know the secret sauce of the Pass amp boards is a blue LED (or green for ZM boards), but according to my daughter the SMPS needs a golden chicken to oversee function.

View attachment 1035860 View attachment 1035861

That is ******* awesome! I wish I'd thought of that!

 

[thomasnadeau]

Hi folks,

I wanted to update you that I've sent a run of kits to restock the diyaudio store. They will arrive tomorrow, and should be ready to roll shortly thereafter so look for the announcement from the store.

Cheers,

--Tom

 

[Halauhula]

Wonderful, and thank you for your efforts. Many appreciate your work, as well as Mark Johnson's work.

 

[Hadox]

I made a thing. Thanks to Mark and everyone else involved who gives so generously.

And here it is in service.

 

[Mark Johnson]

Beautiful! Congratulations @Hadox

 

[carsten.witt]

@Mark Johnson ;

thanks for sharing your design!

 

[thomasnadeau]

I made a thing. Thanks to Mark and everyone else involved who gives so generously.

View attachment 1042829
View attachment 1042827 View attachment 1042828 View attachment 1042832
And here it is in service.

Cool build!

 

[Mark Johnson]

Hi @carsten.witt , I just noticed a feature of your PCB. There's a fairly narrow copper track on the top layer, connecting to 0.04 ohm resistor "R1". Have you checked one of the (free online PCB calculators) to make sure your PCB tracks can safely handle the amount of DC current flowing in your application?



_

 

[Hadox]

Beautiful! Congratulations @Hadox

Cool build!

Thanks! It's been fun. A great project for a relative newb like myself to build confidence with.

 

[thomasnadeau]

Thanks! It's been fun. A great project for a relative newb like myself to build confidence with.

Don't underestimate the confidence building smaller "easier" projects can be. Take your time and learn about the circuits and build methods. That confidence and understanding usually translates into bigger, more complex projects. I speak from personal experience.

 

[audiosteve]

So when are these filter boards going to be available to us mortals? Hopefully with mounting holes. I've been on the DIYAudio store waiting list for months and nothing. What's the story? Anyone know?

 

[thomasnadeau]

The kit boards have mad mounting holes since the second batch, so the current batch has 4 mounting holes.

I sent a large batch to the store a couple of weeks ago, so they should be available soon. The store told me they've switched their back-end system and that it was taking a couple of weeks to get things stocked and programmed, so please hang in there a little while longer.

 

[audiosteve]

The kit boards have mad mounting holes since the second batch, so the current batch has 4 mounting holes.

...... hang in there a little while longer.

Nice! Thanks!

 

[carsten.witt]

Hi @carsten.witt , I just noticed a feature of your PCB. There's a fairly narrow copper track on the top layer, connecting to 0.04 ohm resistor "R1". Have you checked one of the (free online PCB calculators) to make sure your PCB tracks can safely handle the amount of DC current flowing in your application?

@Mark Johnson ,
many thanks for pointing this out!
I didn't make before a calculation but now I see that the track are really to thin. In this case should it max 0A5 (1 OZ) .
A RPi 4B need max 0A8 + SSD max 0A8 ..... :-( I will make a new layout with thicker tracks and a new board.