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F5 with 2SK2013/2SJ313
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Old 11th October 2016, 04:49 PM   #671
massimo is offline massimo  Italy
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There's a "mkII" version of Juma's C-Multi that uses 4 NMosfet IRFP044 (and according to the designer, performs better)
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Old 11th October 2016, 07:45 PM   #672
Nelson Pass is offline Nelson Pass  United States
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F5 with 2SK2013/2SJ313
Quote:
Originally Posted by xrk971 View Post
So if I am run I g 1.5amp bias in my amp, it can push about 3amps to as much as 4.5amps in class A through the speaker?

If I am running 25v rails is the max power about same as regular F5 at 25w?

Do you see any issue with me changing the gain to 20dB?
1) With a .47 ohm Source resistor, probably about 3.5A pk

2) Yes, 25W

3) 6 dB more gain = twice as much distortion, half the damping factor.
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Old 12th October 2016, 11:11 AM   #673
xrk971 is offline xrk971  United States
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Default Capacitance Multiplier

I implemented Juma's capacitance multiplier on a separate heatsink. I have to say that it was simple and I works very well. I am getting 22v rails no load and 19.5v rails under full load with 1.5amps bias current. Ripple measured with AC volts on Fluke is less than 1mV as shown below. Quite an amazing performance from the previous 40mV ripple coming from the CRC filter.

Click the image to open in full size.

The circuit is so simple, I easily did it with P2P right on top of the IRFP240/9240's.

Click the image to open in full size.
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Old 13th October 2016, 01:31 PM   #674
xrk971 is offline xrk971  United States
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I think the cap multiplier is a real gem - sharing. My experience over on SS forum:

http://www.diyaudio.com/forums/solid...ultiplier.html
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Old 13th October 2016, 05:35 PM   #675
albertNL is offline albertNL  Australia
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Quote:
Originally Posted by massimo View Post
There's a "mkII" version of Juma's C-Multi that uses 4 NMosfet IRFP044 (and according to the designer, performs better)
Would that be this one?
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Old 13th October 2016, 06:19 PM   #676
Nelson Pass is offline Nelson Pass  United States
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Quote:
Originally Posted by massimo View Post
There's a "mkII" version of Juma's C-Multi that uses 4 NMosfet IRFP044 (and according to the designer, performs better)
Did he happen to say why that would be?
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Old 13th October 2016, 06:46 PM   #677
massimo is offline massimo  Italy
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Quote:
Originally Posted by albertNL View Post
Would that be this one?
Not exactly, but similar.
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Old 13th October 2016, 07:58 PM   #678
massimo is offline massimo  Italy
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I cannot find the post where Juma explained the "mkII" version of his amp any more, but I still have the schematics. It was May 2011...
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File Type: gif Toshiba F5-sch_by Juma_new2011.gif (9.1 KB, 594 views)
File Type: gif Toshiba F5-psu_by Juma_new2011.gif (10.1 KB, 396 views)
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Old 13th October 2016, 08:14 PM   #679
Dennis Hui is offline Dennis Hui  Canada
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Would be that you now have better matched ripple reduction and rail values
with just N-channel parts since the N and P parts have different Vgs and
transconductance?
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Old 13th October 2016, 08:26 PM   #680
Nelson Pass is offline Nelson Pass  United States
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That is a good argument for the topology, but doesn't give insights as to
why the IRFP044 would be the transistor of choice.
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