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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

One Last Attempt at Discrete Opamp in DIP8 Footprint
One Last Attempt at Discrete Opamp in DIP8 Footprint
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Old 22nd June 2019, 10:42 PM   #51
dimitri is offline dimitri  United States
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Quote:
But I have different components and component values to suit the SMD design.
The one you posted is from the so-called HDAM, which is not unity gain stable.
Patrick, 797 has bootstrapped Q5Q6 mirror, does your implementation has the same?
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Old 23rd June 2019, 11:57 AM   #52
Mark Tillotson is offline Mark Tillotson
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This thread is tempting me to try making a DIP8 adapter for my K2-X: GAP/R MODEL K2-X Socket for 12AX7 and 6AN8 Opamp | #141955721
though I suspect flashover might be an issue with those +/-300V rails, and it might be a tad top-heavy
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Old 23rd June 2019, 01:29 PM   #53
EUVL is offline EUVL  Europe
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> Patrick, 797 has bootstrapped Q5Q6 mirror, does your implementation has the same?

No. No Q12.
But it is a good point. I shall investigate advantage.


Thanks Dimitri,
P.
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Old 23rd June 2019, 01:57 PM   #54
EUVL is offline EUVL  Europe
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Here a small collection.

It takes on average 1 hour to make one (single), excluding matching.
DC offset trimming takes something like 15 minutes.


Patrick

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Attached Images
File Type: jpg 190623 Dual OPA Collection.jpg (567.9 KB, 167 views)
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Old 23rd June 2019, 02:26 PM   #55
EUVL is offline EUVL  Europe
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> 797 has bootstrapped Q5Q6 mirror, does your implementation has the same?

Tried it in Spice.

Distortion (mainly H2) reduces by a factor of ~10.
But trimming of DC offset is very sensitive.
So I think I would stay put for now.


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Old 25th June 2019, 06:10 PM   #56
dimitri is offline dimitri  United States
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Thank you!
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