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RE: AD1955 and transformer I/V stage

Posted by Dave Davenport (M) on June 9, 2007 at 09:15:51

In Reply to: AD1955 and transformer I/V stage posted by SunRa on June 9, 2007 at 07:08:27:

Hi Florin,

If you design your own active output stage, you need to keep in mind that you are trading the gain of the tube for input impedance. A back of the envelope calculation for a similar circuit to the RA Active Output using a 6H30 and 4V output would give an input impedance of about 300Ohms without an input transformer. Using a 1:10 input transformer, such as the LL9206 would lower this to the winding resistance plus a few Ohms. I would recommend the LL9206 rather than the LL1674 for this application because the ratio is higher and the winding resistance is lower.

Dave

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