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 Forum index » Wanted, For Sale, Opportunites and Requests » Parts and Components
WTB OPA2137 & LM394
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b-funk



Joined: Jul 17, 2007
Posts: 186
Location: Berlin

PostPosted: Thu Jan 17, 2008 3:51 pm    Post subject: WTB OPA2137 & LM394 Reply with quote  Mark this post and the followings unread

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
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Clack



Joined: Aug 08, 2005
Posts: 436
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PostPosted: Fri Jan 18, 2008 1:55 am    Post subject: Reply with quote  Mark this post and the followings unread

LM394CN can be bought from futurelec - its not in Germany though but its pretty efficient

http://www.futurlec.com/cgi-bin/search/qty_price.cgi?part_no=LM394N

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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sat Jan 19, 2008 6:56 am    Post subject: Reply with quote  Mark this post and the followings unread

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

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Last edited by yusynth on Tue Jan 22, 2008 12:09 am; edited 1 time in total
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b-funk



Joined: Jul 17, 2007
Posts: 186
Location: Berlin

PostPosted: Sat Jan 19, 2008 8:00 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you guys Very Happy
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hachiman



Joined: Dec 24, 2006
Posts: 56
Location: easterneur

PostPosted: Mon Jan 21, 2008 10:23 am    Post subject: Reply with quote  Mark this post and the followings unread

these are some of the best parts... what are you building? Laughing
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b-funk



Joined: Jul 17, 2007
Posts: 186
Location: Berlin

PostPosted: Mon Jan 21, 2008 6:02 pm    Post subject: Reply with quote  Mark this post and the followings unread

i´m building sume yusynth stuff... vco & filters
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hachiman



Joined: Dec 24, 2006
Posts: 56
Location: easterneur

PostPosted: Mon Jan 21, 2008 6:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

yo thx, Ill check out , Im looking for modular stuff to build to complement a custom CV solution I have in mind Smile
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Etaoin



Joined: Jun 30, 2005
Posts: 760
Location: Utrecht, NL

PostPosted: Tue Jan 22, 2008 12:49 am    Post subject: Reply with quote  Mark this post and the followings unread

hachiman wrote:
these are some of the best parts...


The LM394 is "low end" really. Most people achieve better VCO tracking with the SSM2210.

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hachiman



Joined: Dec 24, 2006
Posts: 56
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PostPosted: Tue Jan 22, 2008 5:35 am    Post subject: Reply with quote  Mark this post and the followings unread

good to know thanks. I save the 394 for line level stereo preamp then
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frijitz



Joined: May 04, 2007
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PostPosted: Tue Jan 22, 2008 12:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

Etaoin wrote:
The LM394 is "low end" really. Most people achieve better VCO tracking with the SSM2210.

Huh? scratch

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.

Very Happy

Ian
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Etaoin



Joined: Jun 30, 2005
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PostPosted: Tue Jan 22, 2008 12:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.

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frijitz



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PostPosted: Tue Jan 22, 2008 3:03 pm    Post subject: Reply with quote  Mark this post and the followings unread

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.

Very Happy

Ian
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Etaoin



Joined: Jun 30, 2005
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PostPosted: Wed Jan 23, 2008 12:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Okay, so not "most people" then Wink

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

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Blue Hell
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Joined: Apr 03, 2004
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PostPosted: Thu Jan 24, 2008 3:36 pm    Post subject: Reply with quote  Mark this post and the followings unread

I split of the transistor pairs question to : http://electro-music.com/forum/topic-23394.html
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adhdboy



Joined: Feb 16, 2005
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PostPosted: Sat Jan 26, 2008 11:59 am    Post subject: LM394 or SSM2210?
Subject description: I will definitely check out Ian's suggestions.
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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.
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frijitz



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PostPosted: Sat Jan 26, 2008 4:18 pm    Post subject: Re: LM394 or SSM2210?
Subject description: I will definitely check out Ian's suggestions.
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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.

Very Happy

Ian
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Luka



Joined: Jun 29, 2007
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PostPosted: Thu Feb 07, 2008 6:53 am    Post subject: Reply with quote  Mark this post and the followings unread

i found some more sources for the opa2137 and opa2134

opa2137: http://www.newark.com/75C4630/semiconductors-prototyping/product.us0?sku=TEXAS-INSTRUMENTS-OPA2137P.

opa2134:
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&Item=160206315487&Category=113484&_trksid=p3907.m29

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