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"Inverted" Aleph J?
"Inverted" Aleph J?
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Old 19th March 2014, 07:06 PM   #11
dieringe is offline dieringe  Germany
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I really would have liked to see those images ...
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Old 22nd December 2017, 06:04 PM   #12
xrk971 is offline xrk971  United States
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"Inverted" Aleph J?
Quote:
Originally Posted by juma View Post
Here is the amp you look for and the thread you want to read:
http://www.diyaudio.com/forums/pass-...ml#post1949735
Very nice, thanks for the design. Indeed, I have lots of BF862 and IRFP9240 is easy to find.

Click the image to open in full size.
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Old 22nd December 2017, 06:08 PM   #13
Zen Mod is offline Zen Mod  Serbia
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"Inverted" Aleph J?
"s" at Q2 and Q5 ?
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Old 22nd December 2017, 06:51 PM   #14
xrk971 is offline xrk971  United States
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"Inverted" Aleph J?
BF862 is interchangeable S & D

This would be a real cute teeny-tiny inverted micro-Aleph J HPA in an all SMT job with ZVP4525G outputs and SOT23 BJTs. Could probably replace Q4 with BSP129 in SOT223 package to get better heat sinking, Q1 could be SOT223 DZT5401, also for more heat sinking and higher dissipation.
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Last edited by xrk971; 22nd December 2017 at 07:09 PM.
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Old 22nd December 2017, 08:14 PM   #15
kinku is offline kinku  United States
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"Inverted" Aleph J?
How many watts at 8ohm load and how much dissipation per channel?
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Old 22nd December 2017, 09:02 PM   #16
xrk971 is offline xrk971  United States
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"Inverted" Aleph J?
I didn’t not run a sim or anything but from Juna’s Schematic: +/-18v rails gives 36v max swing, minus 2x4v drop for each mosfet. So 28vpp output which is good for about 12w into 8ohms. Assuming a bias current of say 1.2amps typical of FW amps, that’s 36vx1.2amp=43w dissipation.
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Old 22nd December 2017, 09:28 PM   #17
juma is offline juma  Germany
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Xrk,
take care about polarities - bottom PSU rail is in this schematic positive
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Old 22nd December 2017, 09:37 PM   #18
Zen Mod is offline Zen Mod  Serbia
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"Inverted" Aleph J?
Quote:
Originally Posted by xrk971 View Post
BF862 is interchangeable S & D.........
....... wrong answer ....

however , you cheated - edited post later (new schm) , without trace

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Old 22nd December 2017, 09:40 PM   #19
Zen Mod is offline Zen Mod  Serbia
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"Inverted" Aleph J?
Quote:
Originally Posted by xrk971 View Post
........ Assuming a bias current of say 1.2amps typical of FW amps, .........


not exactly always ...... and also not exactly figure carved in stone by Papa
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Old 22nd December 2017, 11:15 PM   #20
xrk971 is offline xrk971  United States
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"Inverted" Aleph J?
Quote:
Originally Posted by Zen Mod View Post
....... wrong answer ....

however , you cheated - edited post later (new schm) , without trace

I saw your question after I updated the schematic as I got to the later post where Juma corrected it.

The manufacturer’s spec sheet says it’s interchangeable. I have built circuits thus and that appears to be a true statement. Why is that the wrong answer?

https://www.nxp.com/docs/en/data-sheet/BF862.pdf
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