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 Forum index » DIY Hardware and Software » YuSynth
VCO: OPA2134 instead of OPA2137 ?
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Jaba



Joined: Feb 27, 2009
Posts: 45
Location: Genova, Italy
PostPosted: Mon Mar 02, 2009 4:44 am    Post subject: VCO: OPA2134 instead of OPA2137 ?
Subject description: ask opinion about component substitution		 Reply with quote  Mark this post and the followings unread
Hello,
I am new here, but already building a Yusynth VCO, almost done;
I cannot find OPA2137, but I have a OPA2134
looking at the datasheet it should be good enough, as far as I can understand, and very similar to the recommended OPA2137.
Any suggestion, please ?
thanks
Jaba (Paolo)
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yusynth



Joined: Nov 24, 2005
Posts: 1156
Location: France
PostPosted: Mon Mar 02, 2009 8:51 am    Post subject: Reply with quote  Mark this post and the followings unread
an OPA2134 is just fine.
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Yves
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Jaba



Joined: Feb 27, 2009
Posts: 45
Location: Genova, Italy
PostPosted: Mon Mar 02, 2009 9:27 am    Post subject: Reply with quote  Mark this post and the followings unread
Thank you very much
this will be my first VCO, so I want to make the best I can

PaoloV
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Ali M



Joined: Sep 01, 2009
Posts: 83
Location: uk
PostPosted: Fri Oct 02, 2009 12:55 am    Post subject: Reply with quote  Mark this post and the followings unread
would this be the right component?

http://uk.farnell.com/jsp/search/productdetail.jsp?sku=1097425

thanks
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yusynth



Joined: Nov 24, 2005
Posts: 1156
Location: France
PostPosted: Fri Oct 02, 2009 12:58 am    Post subject: Reply with quote  Mark this post and the followings unread
YES
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Yves
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Ali M



Joined: Sep 01, 2009
Posts: 83
Location: uk
PostPosted: Fri Oct 02, 2009 3:18 am    Post subject: Reply with quote  Mark this post and the followings unread
Sorry Yves,

I only ask because I found them elsewhere for about £5, i thought the farnell price was a bit cheap to be the right thing.

sorry
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yusynth



Joined: Nov 24, 2005
Posts: 1156
Location: France
PostPosted: Fri Oct 02, 2009 4:06 am    Post subject: Reply with quote  Mark this post and the followings unread
Don't be sorry, it is logical Wink
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Yves
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ultrashock



Joined: Dec 10, 2009
Posts: 40
Location: Vienna.AT
PostPosted: Thu Dec 10, 2009 5:55 am    Post subject: Reply with quote  Mark this post and the followings unread
Dear Yves!
Could you please answer if LM358 will be compartible instead of TL072 (instead of much more expensive OPA aforesaid) in OSC (full low-cost for the first time Embarassed )
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yusynth



Joined: Nov 24, 2005
Posts: 1156
Location: France
PostPosted: Thu Dec 10, 2009 6:11 am    Post subject: Reply with quote  Mark this post and the followings unread
ultrashock wrote:
Dear Yves!
Could you please answer if LM358 will be compartible instead of TL072 (instead of much more expensive OPA aforesaid) in OSC (full low-cost for the first time Embarassed )


A LM358 will theoretically work but it is more bound to have offset, the fact is that the VCO will work with a LM358 but don't expect to achieve a good tracking over more than 4 or 5 octaves. The use of a high grade OPA insures an extended level of performance using a cheap LM358 will not.

In other words using a LM358 will result in a low grade though usable VCO, while using an OPA2137 will give a really good VCO.
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Yves
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