<div id="RTEContent">Yes you could use the CA3280 in place of the CA3080.<br> <br> The CA3280 is a dual<br> <br> The Gm bias is a little different, probably would not affect<br> 99% of designs.<br> <br> You could sub it directly and not activate the input linearizing<br> diodes. If you DID activate the input diodes, signal levels<br> could be higher / distortion and noise lower. Offset voltage is<br> usually mich better on the CA3280<br> <br> CA3080 = Chevrolet<br> CA3280 = Cadilliac<br> <br> H^) harry<br><br><b><i>phil macnutt <philmacnutt@mac.com></i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> Sorry to be the dunce, but can I use a CA3280 instead of a CA3080 in any<br>circuit? Advantages? Disadvantages?<br>I tried comparing datasheets, but I just did not understand all the details<br>enough to make a decision.<br><br>phil<br><br>-----Original Message-----<br>From:
owner-synth-diy@dropmix.xs4all.nl<br>[mailto:owner-synth-diy@dropmix.xs4all.nl] On Behalf Of Ian Fritz<br>Sent: Friday, January 06, 2006 8:51 AM<br>To: Ray Wilson; Synth-Diy<br>Subject: Re: [sdiy] How available are these parts to you?<br><br>Hi Ray --<br><br>>How hard do people perceive getting these parts to be on a scale of 1 to <br>>10. With 1 being hard/expensive to 10 being easy/not-as-expensive. I'm <br>>working on something new and I want to make it so that the parts are as <br>>available as possible.<br><br>This is pretty subjective and of course the situation is always dynamic.<br><br>>1) LM3080<br>>2) CA3080<br><br>These are exactly the same thing, as far as I know. They are getting <br>harder to find and more expensive as time goes by. Rate as 6.<br><br>>3) CA3280<br><br>Futurelec has these, and at an incredibly low price. Your <br>price/performance ratio is the best with this option. However it is pretty <br>hard to find this chip anywh!
ere else.
I'd say get as many of these as you <br>will ever need and do it right now. Right now rate as 8, but if Futerlec <br>stops selling them, much lower.<br><br>>4) LM13600<br><br>Don't know of any current source. Rate as 1.<br><br>>5) LM13700<br><br>This is under production in Japan, as I hear. Also a fair amount of old <br>stock seems available. Rating: 10.<br><br>>6) Roll your own simple transconductance amp with transistors/op amps.<br><br>This is not too hard to do, but if you want performance comparable to <br>CA3280, say, you need to use very well matched transistors (< 50uV). So it <br>depends on what you are doing and how much offset variation you can <br>tolerate. Rate at 7.<br><br>You should also note that the NE5517 is currently being produced by ON <br>semi. I got some from them directly. Rating: 10.<br><br> Ian <br><br><br><br></blockquote><br></div>