WTB - WTT: Burr Brown OPA2134PA and MAX1044/ICL7660

mikemaddux · Post by **mikemaddux** » 05 Aug 2010, 05:01

Looking for a Burr Brown OPA2134PA and MAX1044/ICL7660.....

Anyone got any? Looking for a couple of each......could get by with one of each.....

Can pay cash/paypal or trade 3PDT switches, enclosures, or other parts.....

Thanks!

danielzink · Post by **danielzink** » 05 Aug 2010, 11:02

Mike,

I've got 15 ICL7660 - they do not have the "s" suffix if it matters. If they'll work for you - let me know.

Dan

CRBMoA · Post by **CRBMoA** » 05 Aug 2010, 16:30

I have MAX1044s.

mictester · Post by **mictester** » 05 Aug 2010, 18:26

danielzink wrote:Mike,

I've got 15 ICL7660 - they do not have the "s" suffix if it matters. If they'll work for you - let me know.

Dan

The ordinary 7660 has a bit of a problem in some circuit - the clock frequency of the chip is low enough that it can mix with other signals in your circuit and cause heterodynes which you will hear as whistles in the audio. Not pleasant (they're never concordant!). The 7660S has the option of a much higher clock frequency (which is easier to filter off the supply rails) and doesn't cause your pedals to whistle along (out of tune) with the music!

mikemaddux · Post by **mikemaddux** » 05 Aug 2010, 18:43

mictester wrote:
danielzink wrote:Mike,

I've got 15 ICL7660 - they do not have the "s" suffix if it matters. If they'll work for you - let me know.

Dan
The ordinary 7660 has a bit of a problem in some circuit - the clock frequency of the chip is low enough that it can mix with other signals in your circuit and cause heterodynes which you will hear as whistles in the audio. Not pleasant (they're never concordant!). The 7660S has the option of a much higher clock frequency (which is easier to filter off the supply rails) and doesn't cause your pedals to whistle along (out of tune) with the music!

Ya...i've run ito that whistling problem before........

danielzink · Post by **danielzink** » 06 Aug 2010, 20:26

mictester wrote:
danielzink wrote:Mike,

I've got 15 ICL7660 - they do not have the "s" suffix if it matters. If they'll work for you - let me know.

Dan
The ordinary 7660 has a bit of a problem in some circuit - the clock frequency of the chip is low enough that it can mix with other signals in your circuit and cause heterodynes which you will hear as whistles in the audio. Not pleasant (they're never concordant!). The 7660S has the option of a much higher clock frequency (which is easier to filter off the supply rails) and doesn't cause your pedals to whistle along (out of tune) with the music!

Yes. That's why I mentioned that they didn't have the s designation.

Dan

Scruffie · Post by **Scruffie** » 17 Aug 2010, 08:57

Did you ever get these? I've got a handfull of MAX1044 and a single OPA2134PA I can part with.

mikemaddux · Post by **mikemaddux** » 18 Aug 2010, 11:31

yep, got em....thanks