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About possible Babelfish J interest
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Old 10th September 2019, 08:26 PM   #561
mbrennwa is offline mbrennwa  Switzerland
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About possible Babelfish J interest
Quote:
Originally Posted by Zen Mod View Post
final schematic for just base pcb iteration and parts placement pictures
What is the max bias current for a single transistor pair?

What are the dimensions of the board?

How can I (still) get a board?
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Old 10th September 2019, 08:37 PM   #562
Zen Mod is offline Zen Mod  Serbia
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About possible Babelfish J interest
IRFP150 - standard rail (22V5dc , resulting from 18Vac secondary) , will work with Iq of 2A for eons , if properly cooled

higher rails , for more power , demands more output pairs (thus Daughter boards) and decrease of Iq per vertical pair , to limit max sane dissipation per device at max 45W

base pcb is shown with dimensions in post #1

it is slightly changed later in development , but nothing substantial

that board you can get if you contact me , first reading Trade thread , link of which is also in post #1
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Old 10th September 2019, 09:27 PM   #563
TungstenAudio is offline TungstenAudio  United States
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45W per device is for sissies!
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Old 10th September 2019, 11:26 PM   #564
Zen Mod is offline Zen Mod  Serbia
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About possible Babelfish J interest
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Old 11th September 2019, 05:38 AM   #565
mbrennwa is offline mbrennwa  Switzerland
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About possible Babelfish J interest
Quote:
Originally Posted by Zen Mod View Post
IRFP150 - standard rail (22V5dc , resulting from 18Vac secondary) , will work with Iq of 2A for eons , if properly cooled
Sounds good to me. Should the transistors pairs go to the same heatsink (for thermal tracking), or can they each have their own heatsink? I am thinking of doing a Pass Aleph style build with four heatsinks on each side of the chassis. Then I'd have 2 x 2 IRFP150 for a stereo amplifier, so each IRFP150 could go to it's own heatsink.
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Old 11th September 2019, 09:08 AM   #566
Zen Mod is offline Zen Mod  Serbia
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separate heatsinks - yes, already done

heatsinks being parts of same enclosure (temperature container) - that's enough for proper thermal tracking
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