Posted by Larry

June 11, 2011 - 11:02 pm

Thanks for link Steve. Regarding the power tran, I note you did not relocate,shield or change to toroid as some others have indicated. Did you see no improvement in doing so? I have a HP339A so I know what this circuit is capable of doing. Good work.

Posted by Steve L.

June 11, 2011 - 10:15 pm

Hi Larry, The HA3-2625-5 is available from Newark electronics here: Newark link The listing is a little confusing but it IS in the DIP package and they have 400 in stock and they will sell quantity-1 for $8.55. Note that after stock is depleted, they will only be available in multiples of 500. I did not try any other opamps, since I felt confident that this one would work well there (per the original HP design). However, I imagine that there are some high-performance opamps which could match it. This one has 100MHz gain-bandwidth, 35V/us slew rate and works from ±15V power supplies. I will be happy to help if you have any other questions. Steve

Posted by Larry

June 11, 2011 - 09:52 pm

Have you a source for the HA3-2625-5 IC? If not have you tried another low distortion opamp?

Posted by Steve L.

February 13, 2010 - 08:11 pm

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