PS3100 Resonator PCBs

Fernando · Posted: Tue Mar 13, 2007 6:05 am Post subject:

well done, thanks a million for working this out!!!

krisp14u · Joined: Nov 11, 2006 Posts: 206 Location: uk

fonik · Posted: Wed Mar 14, 2007 3:28 am Post subject:

the documentation for the PCB is now online:
PS3100 PCB documentation

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Great stuff.

You have an LM1448 in the BOM. That probably needs to be the LM1458?

andrewF · Posted: Wed Mar 14, 2007 6:09 am Post subject:

fonik · Posted: Wed Mar 14, 2007 7:11 am Post subject:

Uncle Krunkus · Posted: Wed Mar 14, 2007 7:53 am Post subject:

Looks great Fonik, top job! Cool

I would get one, but I've just got way too much on my plate right now.

Fernando · Posted: Wed Mar 14, 2007 10:23 am Post subject:

you are a master! thank you very much!

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Is there a specific reason you have chosen silver mica caps?
Or more specific, can I use polystyrene there? I have plenty of 1nF polystyrene, but would have to order the (expensive) silver mica ones.

fonik · Posted: Wed Mar 14, 2007 11:58 pm Post subject:

it's good practice, i think - and it follows the original design. you may use poly or ceramic instead...

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Yes, but general poly or ceramic would be less stable I guess. That's why I wondered if silver mica was chosen for a property that polystyrene also has (low leakage, for example).

Ray Wilson still specifies either silver mica or polystyrene for his VCO (where others chose polypropylene, by the way).

Anyway, I'll try polystyrene and see how that sounds. There's only one shop over here that sells 1nF silver mica (at about 3 euros each). I might get them if I need something else from them...

Funky40 · Posted: Thu Mar 15, 2007 8:10 am Post subject:

sorry,
1.) what is silver mica in german ? Is it Styroflex ?
2.) and polystyrene ? folie ?

Fernando · Posted: Thu Mar 15, 2007 8:53 am Post subject:

Styroflex = polystyrene, afaik

fonik · Posted: Thu Mar 15, 2007 9:07 am Post subject:

jksuperstar · Posted: Thu Mar 15, 2007 4:33 pm Post subject:

Silver Mica and Polystyrene both have low Dielectric absorption, which isn't just about leakage, it's also about how the cap discharges as well, and the uniformity that the charge is released. Both would be good.

Here's a sticky on the subject (look at the bottom for Blue Hell's link, not the original post).
http://electro-music.com/forum/topic-7474.html

I think DA% is discussed in Part II of the article. Either way, everyone should read both articles on choosing capacitors (as well as the many other papers at that site!)

-Justin

Funky40 · Posted: Fri Mar 16, 2007 7:09 pm Post subject:

ok, thank you guys

sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

I just received my PCB in the mail yesterday - looks great Cool

Danke Fonik!

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

I have two suggestions for a possible future run:

C16 is a bit too close to U4. 680nF WIMA doesn't fit, for instance. Also, it's useful to have an extra hole at 5mm as well for the larger capacitors.

C7, C9 and C11 could also do with 5mm spacing. The only thing I have that actually fits there is multilayer ceramic, which is of course terrible in the audio path.

Otherwise: great job!

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Posted Image, might have been reduced in size. Click Image to view fullscreen.

fonik · Posted: Sat Mar 17, 2007 11:12 am Post subject:

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

Uncle Krunkus · Posted: Sat Mar 17, 2007 2:43 pm Post subject:

Very nice looking boards Fonik.

fonik · Posted: Sat Mar 17, 2007 2:53 pm Post subject:

philpeery · Joined: Nov 08, 2006 Posts: 137 Location: new jersey, usa

Fonik, this looks like an awesome project! I missed the original announcement, are there any boards left over? I'd take 2 in a heartbeat! If not, will there be another run?

Regards,
Phil

fonik · Posted: Mon Mar 19, 2007 12:18 am Post subject:

there are still a few PCBs left...

etaoin · Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL

By the way, is the "wet" output supposed to be lower gain than the "dry" output?
I need to have to mix output at about 90% and up to even hear the filtered signal.