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Old 12th August 2013, 01:56 PM   #141
tinitus is offline tinitus  Europe
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just a short note

I have two 2x 22V trafos for F5 projects
the +/-30V is about what the jfets can take

so I will test with the extern power supplies I had planned to build with those trafos

with the regs they will work for low power ClassA as well, be it Standard F5 or Juma's 2sk2013/2sj313 version

now, should I go safe with the Renesas laterals first, as per schematic, or straight to the modification with the more exotic Toshibas

cheers
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Old 12th August 2013, 02:57 PM   #142
PMI is offline PMI  United States
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Quote:
Originally Posted by tinitus View Post
just a short note

I have two 2x 22V trafos for F5 projects
the +/-30V is about what the jfets can take

so I will test with the extern power supplies I had planned to build with those trafos

with the regs they will work for low power ClassA as well, be it Standard F5 or Juma's 2sk2013/2sj313 version

now, should I go safe with the Renesas laterals first, as per schematic, or straight to the modification with the more exotic Toshibas

cheers
I personally would go with the Renesas parts first, because I am always interested in how component changes affect the sound. There are few opportunities for one person to make a comparison like this, same circuit, same power supply, different set of power devices.
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Old 31st December 2016, 10:04 PM   #143
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I am drawing this in Sprint6 and notice that the schematic says +24/+24. Is this an error? Is the lower rail -24?

Thanks, Terry
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Old 31st December 2016, 11:02 PM   #144
juma is offline juma  Germany
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Quote:
Originally Posted by still4given View Post
I am drawing this in Sprint6 and notice that the schematic says +24/+24. Is this an error? Is the lower rail -24?

Thanks, Terry
Terry, where did you see such a schematic (post#)?
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Old 1st January 2017, 02:21 AM   #145
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Excuse me.+25V/+25V. Post #1
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Old 1st January 2017, 07:51 AM   #146
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Terry that is correct, Juma marked those capacitors polarity, nothing wrong with that. Not the usual but still correct!
Happy New Year to all!
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Old 1st January 2017, 11:05 AM   #147
juma is offline juma  Germany
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Quote:
Originally Posted by still4given View Post
Excuse me.+25V/+25V. Post #1
I don't see that. Amp's upper rail is +25V (plus pole of V2) and the lower rail is -25V (minus pole of V3) with minus pole of V2 and plus pole of V3 connected to GND. Nothing unusual there...

Maybe you shouldn't rush into building this one before reading the whole thread, there are couple of things one needs to understand in order to build it properly.
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Old 1st January 2017, 01:46 PM   #148
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Sorry. I just realised those are voltage sources. I did read the whole thread.

I'm not planning to build this amp. I was just drawing it so I could give him some pdfs for etching.
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Old 7th January 2017, 05:21 AM   #149
prasi is offline prasi  India
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Hi Juma,
here is a layout that i did,
questions
1. is it ok to mount 2sj313 and 2sk2013 on main heat sink?
2. is the distance between o/p mosfets ok for proper dissipation?
3. can one use 0.33 ohm resistors for R14/15/20/22?

the second pic is for people who prefer high contrast.
all views from component side..
Attached Images
File Type: png f5buzquito.png (61.5 KB, 148 views)
File Type: png f5buzquito-HC.png (122.7 KB, 149 views)
File Type: png sch.png (6.7 KB, 153 views)

Last edited by prasi; 7th January 2017 at 05:25 AM.
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Old 7th January 2017, 07:48 AM   #150
juma is offline juma  Germany
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1. Yes
2. No, except if you want to make a different amp out of it by biasing the output stage low. The layout in post #1 is better.
3. I would rather use 0R1 and select output mosfets from same batch to avoid current hogging

I would also change the biasing scheme to make it resistant to current changes in second stage
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Last edited by juma; 7th January 2017 at 07:51 AM.
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