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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
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Old 10th July 2018, 09:09 PM   #2691
pinnocchio is online now pinnocchio  Canada
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It is the Patek. We don't hear from Peter Daniel anymore...
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Old 10th July 2018, 09:11 PM   #2692
Vunce is offline Vunce  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
X,
I believe that is a chipamp/ gainclone type of build.

Oops, I didn’t refresh page. Yeh, what you guys said:-)

Last edited by Vunce; 10th July 2018 at 09:31 PM.
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Old 10th July 2018, 09:15 PM   #2693
Juntuin is online now Juntuin  Finland
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Quote:
Originally Posted by zman01 View Post
Juntuin,

Very nice work with the build! Congratulations on the successful execution of some bold design ideas.
Thanks Z, sides will get trashed tough and something else is coming as replacement but even then, this is not the most conservative build..but neither is the B.B., it's rather something old combined to something new.
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Old 10th July 2018, 10:33 PM   #2694
wtl is offline wtl  Australia
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
Juntuin,

First Class Build!!!!

Steve.
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Old 11th July 2018, 12:44 AM   #2695
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
A gainclone built like a Class A. Nothing against chipamps here, just so much more fun to make discrete amps.
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Old 12th July 2018, 10:53 PM   #2696
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
This is interesting. Matched PNP in SMT package.

https://www.mouser.com/datasheet/2/3...6-D-775558.pdf

Although specs say current gain matching to within 10% whereas we hand match Hfe to typically 1%.

KSA992 also available in SOT23 package - it’s called FJV992MTF.

https://www.fairchildsemi.com/datasheets/FJ/FJV992.pdf

The KSC1845 is available as SOT23 and called FJV1845PMTF

https://www.fairchildsemi.com/datasheets/FJ/FJV1845.pdf

The front end of the Alpha and the Aleph CCS could theoretically be shrunken down to the size of large postage stamp if all SMT parts were used.
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Last edited by xrk971; 12th July 2018 at 11:00 PM.
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Old 13th July 2018, 01:03 PM   #2697
tonza75 is offline tonza75  Europe
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Default The front end of the Alpha and the Aleph CCS could theoretically be shrunken down to

This is true it's a postcard from the past passed last labs.
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Old 13th July 2018, 05:35 PM   #2698
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
The Aksa Lender preamp daughter cards are essentially the front end, but maybe about size of 4 postage stamps. This one is on a metal core PCB.

Click the image to open in full size.
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Old 18th July 2018, 04:54 PM   #2699
xrk971 is offline xrk971  United States
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Aksa Lender P-mos Hybrid Aleph (ALPHA) Amplifier
I am curious what rail voltages builders of the Alpha 20 and Alpha BB are actually running at? There is a large amount of voltage sag with linear trafos and it seems to me, no matter how I try, I end up always a volt or two below recommended rail voltage. Also, if you are above, is the heat output manageable?

I recently bought a pair of 22VAC 300VA Anteks, hoping to get a solid 27vdc under load of 1.6amps. After the CRCRCRC, I am getting 25.6v. This is for a high output variant of the Alpha 20 that I am testing - just seeing if pushing higher voltage and increased cooling via CPU coolers and fans can work to boost power output.
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Last edited by xrk971; 18th July 2018 at 04:57 PM.
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Old 18th July 2018, 06:31 PM   #2700
gaborbela is offline gaborbela  Canada
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With the 22V transformer, you get 26.4V plus U use CRCRCRC power supply. With the 3pc R you burn up some power also. I hope you not using any high-value resistors there to burn up more power. Your 25.6V is absolutely normal with your setup.
When you buy a transformer to regular Class A bias calculation(not talking about Alep X where the total bias is over 7A per channel) 22ACV x 1.2 under load =26.4V DC.
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