GB: Round #2; Fo-Felix EMI Filter for AC mains 120/230v; By Folsom

[Destroyer OS]

I will do a GB #4 once GB #3 is exhausted.

Until then just move the resistor or replace it if you are worried. There is no reason to replace GB #2-3 boards with something else when they work as intended, and can be made so the resistor wont be the secondary fuse for free or a few cents.

 

[shattered_dream]

Hmmm I have these filters... Together with one of the DC traps from another group buy... And I have a small humming... Is it possible that these filters cause that? Or is it the DC trap before the filter?

 

[Destroyer OS]

I would try without the DC trap. Once before on a rather different power filter it did not like a DC trap. The result was heat, however. But there is enough similarity between the two that I would give a shot without the DC trap first.

You are more than welcome to post pictures or diagrams, if we cannot quickly despatch the solution.

 

[shattered_dream]

Did try it without DC trap..
Nothing changed...
I have three of these filters which are fed parallel everyone has its own power outlet...

 

[Destroyer OS]

Where is the hum coming from exactly?

Have you checked all your IC's for continuity? That's one of the most common places to get it at the speakers.

 

[shattered_dream]

The hum is coming from inside of the cabinet where the filters are placed...
Don't have it at the speakers

 

[Destroyer OS]

Pictures would be appreciated. I'm thinking of much that would cause hum..

 

[Richard]

The 3 boards arrived all safe and sound, thank you for the excellent service.
Cheers,
Richard

 

[Tonyb]

Are there any filter boards left?

 

[akasaka]

I’d take 4 if available?

 

[AmpUtator]

Are there any filter boards left?

I'm wondering the same.

 

[Destroyer OS]

There are a few boards left (from GB #3). If you specify quantity I can PM you, otherwise PM me.

 

[AmpUtator]

Finally finished my first Fo-Felix. My soldering skills could stand improvement but I think it'll work.

 

[Destroyer OS]

As long as none of them are cold soldered then it's no big deal. You should be able to see solder flow onto the pad of the via. One you have that, it should all be good even if you have a little extra solder. Obviously you shouldn't be able to wiggle anything freely.

 

[Destroyer OS]

The hum is coming from inside of the cabinet where the filters are placed...
Don't have it at the speakers

An "easy" way to get pics online. Cellphone - email yourself - log into email on computer - upload to imgbb from computer.

 

[Destroyer OS]

Oh and anyone please feel free to chime in on how you like your filters!

 

[shattered_dream]

Will do Sunday or Monday... But besides of the hum... I really like the filters

 

[AmpUtator]

FWIW, I ran across this info on DC-Blocking and thought it was interesting al-tho over my head. Problem is you have to buy the software. They do have other software that looks interesting. Just thought I'd pass it along for anyone interested.


Block DC component - Simulink


Example photo.

 

[AmpUtator]

I think this is correct .

 

[Destroyer OS]

You got it.