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4th May 2019, 09:01 PM
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#1 |
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diyAudio Member
Join Date: Oct 2003
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One Last Attempt at Discrete Opamp in DIP8 Footprint
As the film title says, “Never say never”.
So perhaps I should not have used the word last attempt. Anyhow, a DC-stable discrete opamp in a DIP-8 Footprint has remained unfinished business for me, despite a few attempts over the years. The previous failures were largely due to DC offsets and unity-gain stability. In the last 18 months, after much contemplation, a renewed effort was made to take on this challenge one last time. This time with much better success, apparently. Nothing really ground breaking. But that is also not where the difficulty lies. Patrick .
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4th May 2019, 09:03 PM
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#2 |
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diyAudio Member
Join Date: Oct 2003
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Opamp Topologies
Firstly a discussion about different basic opamp topologies.
Patrick .
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4th May 2019, 09:06 PM
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#3 |
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diyAudio Member
Join Date: Oct 2003
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SOPA
The first topology that was built and tested, as Dual version.
Patrick .
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4th May 2019, 09:13 PM
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#4 |
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diyAudio Member
Join Date: Oct 2003
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JCOPA
The 2nd topology was based on the JC Pro-1.
Just for fun, this one is SOIC8 compatible.  Patrick .
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4th May 2019, 09:18 PM
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#5 |
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diyAudio Member
Join Date: Oct 2003
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J-797
The last (but not least) has just been built today and shown here on test fixture.
Distortion measurements still have to be made. But all basic functional tests were according to expectation. Patrick .
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4th May 2019, 11:19 PM
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#6 |
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diyAudio Member
Join Date: May 2018
Location: Cambridge UK
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Time to move to pre-biased transistor arrays in SOT1216 package perhaps?
 https://assets.nexperia.com/document...eet/PQMD10.pdf |
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5th May 2019, 03:09 AM
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#7 |
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diyAudio Member
Join Date: Oct 2003
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If I don't care about hfe linearity, perhaps.
Patrick
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5th May 2019, 04:11 AM
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#8 |
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diyAudio Moderator
Join Date: Oct 2010
Location: Denver, Colorado
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Absolutely fantastic!
Looking forward to seeing more about this!
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Illustrated Build Guides - Pass F4 - Pass B1 - Pass F5 - Pearl 2 - O2 HPA - Hagerman Bugle 2 - Pass Aleph J - Me at BA '13 -Pass F5Turbo - BA-3 Amp - BA-3 Preamp - F6 AmpCampAmp Me at BAF '18https://www.youtube.com/watch?v=pl0GniCEoVkMe at BAF19https://www.youtube.com/watch?v=28PpmM-x__4 |
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5th May 2019, 05:50 AM
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#9 |
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diyAudio Member
Join Date: Oct 2003
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What more would you like to see ?
Patrick
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