[sdiy] Noob Question: Passive Filter Design

[Colin f]

Hi Ingo, 

> I count 15 on the schematic. Is this correct?

Yes. The brown ones look much like the sort of inductors you find in vintage
wah-wah pedals and electronic organs.
People charge silly money for them on eBay, for the gullible guitaring
types.
"All the vintage mojo is in the inductor".
At nearly $20 a piece, it better be.

> On the PCB I count 13 of the round brown things and two that 
> look like little transformers. Which ones in the schematic 
> are the two?  
> The 250mH with the double line drawn next to them (upper half 
> of the schematic)?

Yes, those are the inductors for the two snare drums.
Maybe the iron core provides the snare sound ?
I guess the characteristics of the two different types of inductors must
have been a consideration in the design, as they are not greatly dissimilar
values.

Cheers,
Colin f