Author |
Message |
b-funk
Joined: Jul 17, 2007 Posts: 193 Location: Berlin
|
Posted: Thu Jan 17, 2008 3:51 pm Post subject:
WTB OPA2137 & LM394 |
|
|
hi folks,
has anyone 2 spare OPA2137 (DIP) and 1 spare LM394N or CN (DIP) and is willing to sell those to me? or maybe somebody can give me a hint where to buy those in germany?
best wishes,
tobias |
|
Back to top
|
|
|
Clack
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
G2 patch files: 1
|
|
Back to top
|
|
|
yusynth
Joined: Nov 24, 2005 Posts: 1314 Location: France
|
Posted: Sat Jan 19, 2008 6:56 am Post subject:
|
|
|
Well for the LM394 I ordered mine at futurlec www.futurlec.com, they can be trusted.
For the OPA2137 you can use the OPA2134 as a close substitute they are available at www.reichelt.de _________________ Yves Last edited by yusynth on Tue Jan 22, 2008 12:09 am; edited 1 time in total |
|
Back to top
|
|
|
b-funk
Joined: Jul 17, 2007 Posts: 193 Location: Berlin
|
Posted: Sat Jan 19, 2008 8:00 am Post subject:
|
|
|
thank you guys |
|
Back to top
|
|
|
hachiman
Joined: Dec 24, 2006 Posts: 56 Location: easterneur
|
Posted: Mon Jan 21, 2008 10:23 am Post subject:
|
|
|
these are some of the best parts... what are you building? |
|
Back to top
|
|
|
b-funk
Joined: Jul 17, 2007 Posts: 193 Location: Berlin
|
Posted: Mon Jan 21, 2008 6:02 pm Post subject:
|
|
|
i´m building sume yusynth stuff... vco & filters |
|
Back to top
|
|
|
hachiman
Joined: Dec 24, 2006 Posts: 56 Location: easterneur
|
Posted: Mon Jan 21, 2008 6:06 pm Post subject:
|
|
|
yo thx, Ill check out , Im looking for modular stuff to build to complement a custom CV solution I have in mind |
|
Back to top
|
|
|
etaoin
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
|
Posted: Tue Jan 22, 2008 12:49 am Post subject:
|
|
|
hachiman wrote: | these are some of the best parts... |
The LM394 is "low end" really. Most people achieve better VCO tracking with the SSM2210. _________________ http://www.casia.org/modular/ |
|
Back to top
|
|
|
hachiman
Joined: Dec 24, 2006 Posts: 56 Location: easterneur
|
Posted: Tue Jan 22, 2008 5:35 am Post subject:
|
|
|
good to know thanks. I save the 394 for line level stereo preamp then |
|
Back to top
|
|
|
frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
|
Posted: Tue Jan 22, 2008 12:20 pm Post subject:
|
|
|
Etaoin wrote: | The LM394 is "low end" really. Most people achieve better VCO tracking with the SSM2210. |
Huh?
Can you expand on that a bit? Who exactly is having trouble getting the LM394 to track? This is *not* a low end chip. I have gotten perfect tracing up to 30kHz with it. In fact, it is better than what you need for an expo converter -- I usually use the CA3083.
Ian |
|
Back to top
|
|
|
etaoin
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
|
Posted: Tue Jan 22, 2008 12:27 pm Post subject:
|
|
|
I have experienced it myself.
Ray Wilson also sees 2 octaves more tracking with the SSM2210 instead of the LM394 in his VCO (he explicitly advises using it on his website).
So I just assumed the SSM2210 was better. _________________ http://www.casia.org/modular/ |
|
Back to top
|
|
|
frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
|
Posted: Tue Jan 22, 2008 3:03 pm Post subject:
|
|
|
Etaoin wrote: | I have experienced it myself.
Ray Wilson also sees 2 octaves more tracking with the SSM2210 instead of the LM394 in his VCO (he explicitly advises using it on his website).
So I just assumed the SSM2210 was better. | OK, but two guys using a "budget" design is hardly "most people".
The 2210 might have slightly better specs, but with a careful design you can easy get 9 octaves tracking using inexpensive monolithic pairs such as the CA3083. The LM394 is an excellent choice for a VCO converter, as the many designs that have used it show.
Ian |
|
Back to top
|
|
|
etaoin
Joined: Jun 30, 2005 Posts: 761 Location: Utrecht, NL
|
Posted: Wed Jan 23, 2008 12:45 am Post subject:
|
|
|
Okay, so not "most people" then
frijitz wrote: | The 2210 might have slightly better specs, but with a careful design you can easy get 9 octaves tracking using inexpensive monolithic pairs such as the CA3083. |
Yes, but are any of the pcb designs out there actually using such careful designs? The ones I've tried (MFOS, CGS, Marc Bareille's ASM) seem to benefit from the SSM2210.
But maybe I just have a bad batch of LM394's...
I have the DIPs from Futurelec and some cans from Farnell. The cans are definitely better as well.
Louis _________________ http://www.casia.org/modular/ |
|
Back to top
|
|
|
blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
|
|
Back to top
|
|
|
adhdboy
Joined: Feb 16, 2005 Posts: 57 Location: denver
|
Posted: Sat Jan 26, 2008 11:59 am Post subject:
LM394 or SSM2210? Subject description: I will definitely check out Ian's suggestions. |
|
|
I have the greatest respect for Ian. He is very analytical and makes excellent suggestions. My results (regarding LM394 versus SSM2210) were found informally by replacing my LM394 (can type) pairs with SSM2210 (DIP type). The SSM2210 seemed to just work after I popped it in replacing the LM394 and thus I suggested it's use instead of the LM394. I will definitely check out Ian's suggestions regarding the LM394 since it is more economical than the SSM2210. From reading Ian's posts and replies on the synth-diy list it is obvious that he has a lot of skill at in-depth electronic analysis (which is not my strongest suit) including the math behind it all. As I have often said "I'm a breadboard experimental type of guy" and I make suggestions based on observations rather than analysis. If Ian makes a suggestion it's definitely worth checking out. _________________ There 10 kinds of people in this world that understand binary those that do and those that don't. |
|
Back to top
|
|
|
frijitz
Joined: May 04, 2007 Posts: 1734 Location: NM USA
Audio files: 54
|
Posted: Sat Jan 26, 2008 4:18 pm Post subject:
Re: LM394 or SSM2210? Subject description: I will definitely check out Ian's suggestions. |
|
|
adhdboy wrote: | I have the greatest respect for Ian. He is very analytical and makes excellent suggestions. My results (regarding LM394 versus SSM2210) were found informally by replacing my LM394 (can type) pairs with SSM2210 (DIP type). The SSM2210 seemed to just work after I popped it in replacing the LM394 and thus I suggested it's use instead of the LM394. I will definitely check out Ian's suggestions regarding the LM394 since it is more economical than the SSM2210. From reading Ian's posts and replies on the synth-diy list it is obvious that he has a lot of skill at in-depth electronic analysis (which is not my strongest suit) including the math behind it all. As I have often said "I'm a breadboard experimental type of guy" and I make suggestions based on observations rather than analysis. If Ian makes a suggestion it's definitely worth checking out. |
Many thanks for the kind words, Ray! Hopefully we can work together and find out why the two chips seem to behave so differently in your application.
Ian |
|
Back to top
|
|
|
Luka
Joined: Jun 29, 2007 Posts: 1003 Location: Melb.
|
|
Back to top
|
|
|
|