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 Forum index » DIY Hardware and Software
Source for CA3046 / CA3280 ???
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macumbista



Joined: Sep 12, 2007
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PostPosted: Fri Mar 22, 2013 2:14 am    Post subject: Source for CA3046 / CA3280 ??? Reply with quote  Mark this post and the followings unread

Especially the CA3280...

Futurelec, Banzai and Small Bear are out of both.

Bridechamber has CA3046 but not CA3280.

Might need to buy extras as I have heard that there are lots of bad OTAs out there that show up after a "burn in" time. Or maybe someone has 1 x CA3046 and 2 x CA3280 they have tested and are willing to sell?

Thanks!!!
Derek

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analog_backlash



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PostPosted: Fri Mar 22, 2013 2:31 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Derek,

I know a (quite expensive) UK source for both ICs:

http://www.cricklewoodelectronics.com/Cricklewood/home.php

They want £2.50 for the CA3046 and £9.00 for the CA3280. I can't vouch for these ICs, but I have bought other "hard to find" ICs from them and they've been fine. They appear to be in stock, but it might be worth e-mailing them first to double check.

Gary
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macumbista



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PostPosted: Fri Mar 22, 2013 2:44 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Gary, and thanks!

Those prices seem close to these guys:

http://www.dalbani.co.uk/

Might get the 3046 from Bridechamber along with some other rare things and bite the bullet on the 3280s.

Best!
D.

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isak



Joined: Dec 13, 2009
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PostPosted: Fri Mar 22, 2013 6:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Maybe you can check with Geatano, he'se a member here.
He is very reliable guy.

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Osal



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PostPosted: Fri Mar 22, 2013 8:53 am    Post subject: Reply with quote  Mark this post and the followings unread

http://www.utsource.net/
Very Happy

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LeftyLogic



Joined: Feb 09, 2013
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PostPosted: Fri Mar 22, 2013 9:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Looks like Tayda electronics has the 3046 for $1.10, but I don't know whether it's legit or not. Anybody had any experience with these guys?

http://www.taydaelectronics.com/ca3046-npn-transistor-array.html
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isak



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PostPosted: Fri Mar 22, 2013 9:18 am    Post subject: Reply with quote  Mark this post and the followings unread

I ordered from tayda the 3046, they are good.
Test them with the ody vco and bergfotron wave shapers.
the same results as my RCA ones Smile

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elmegil



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PostPosted: Fri Mar 22, 2013 9:34 am    Post subject: Reply with quote  Mark this post and the followings unread

I have bought many things from tayda and not had a problem yet, though I don't believe I've ordered this particular chip.
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analog_backlash



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PostPosted: Fri Mar 22, 2013 4:59 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've also ordered from Tayda (once). The only problem that I've had was a couple of suspect LEDs (but I may have just fried them by accident). Mind you, for the prices they charge for LEDs, it doesn't really bother me if one or two don't work!

Gary
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sonicwarrior



Joined: Dec 22, 2005
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PostPosted: Sat Mar 30, 2013 4:28 am    Post subject: Re: Source for CA3046 / CA3280 ??? Reply with quote  Mark this post and the followings unread

macumbista wrote:
Might need to buy extras as I have heard that there are lots of bad OTAs out there that show up after a "burn in" time.


I could offer 2 CA3280 but never heard of the 'burn in' time issue. I have a finished MOTM-190 in which I can test them but how much 'burn in' time is needed then?
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macumbista



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PostPosted: Sat Mar 30, 2013 4:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks! I think I have the 3280s covered now. If not, I'll let you know.

Some people have reported failure on these chips after a certain number of hours (eight maybe?). I think it depended very much on the source. Can't find the thread at the moment, maybe Search or Google is your friend here...

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sonicwarrior



Joined: Dec 22, 2005
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PostPosted: Sat Mar 30, 2013 6:09 am    Post subject: Reply with quote  Mark this post and the followings unread

macumbista wrote:
maybe Search or Google is your friend here...


Well, if you want people to test you have to provide this information. Laughing
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macumbista



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PostPosted: Sat Mar 30, 2013 6:13 am    Post subject: Reply with quote  Mark this post and the followings unread

sonicwarrior wrote:
macumbista wrote:
maybe Search or Google is your friend here...


Well, if you want people to test you have to provide this information. Laughing


My solution was just to find extras. Honestly I think this figure can vary a lot. Use is the only test. Best!!!!! D.

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pirx



Joined: Mar 26, 2010
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PostPosted: Sat Mar 30, 2013 6:15 am    Post subject: Reply with quote  Mark this post and the followings unread

Electronic Goldmine has LM3046 (direct CA3046 replacement) for $0.49:

http://www.goldmine-elec-products.com/prodinfo.asp?number=G32158
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