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Old 2nd August 2007, 09:36 PM   #11
suzyj is offline suzyj  Australia-Aboriginal
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Hey, those Sanyo transistors are neat.

After playing with the compensation a tad to tame the beast :P , then running 1KHz, 800W into 8Ohms (2 bridged amplifiers): 0.00005%.

I've attached my schematic.
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File Type: zip aem6000_penta_fet_bridged.asc.zip (7.1 KB, 197 views)
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Old 3rd August 2007, 12:42 AM   #12
PB2 is offline PB2  United States
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Nice work, I like the duals.
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Old 3rd August 2007, 01:31 AM   #13
suzyj is offline suzyj  Australia-Aboriginal
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Actually, I just found out the duals aren't. Duals, that is. The PBSS8110Y and PBSS9110Y are listed in Farnells catalogue as duals, but when you get the data, they're actual single transistors (though in six pin packages).

I went on a search for high-voltage duals, and found the IMX8, from Diodes inc. 120V Vceo, hFE>180, 140MHz fT... Even better than the NXP devices. They're only good for 50mA, and 300mW, but that shouldn't be a worry in the earlier stages.
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Old 3rd August 2007, 02:14 AM   #14
PB2 is offline PB2  United States
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Oh, I wasn't familiar with the numbers and yes high voltage duals are hard to find.

Did you consider doing the bridged design by hanging another output stage from the other side of the diff VAS, to provide a balanced output stage?
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Old 3rd August 2007, 12:24 PM   #15
felixx is offline felixx  Romania
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@suzyj
What do you think about 3 pairs on 4 ohms in this link:
http://www.turneraudio.com.au/solids...s1mosfets.html

The amp is meant to be used with above 4 ohm loads, but will tolerate normal home use with loads down to 2 ohms when the power is unlikely to average high levels.
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Old 3rd August 2007, 02:45 PM   #16
AndrewT is offline AndrewT  Scotland
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Hi Felix,
three pair on +-70Vdc cannot do justice to 4ohm reactive and certainly not 2ohms. Forget it.
But on 8ohms it should just about cope if the loading is not too severe.
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Old 3rd August 2007, 11:15 PM   #17
suzyj is offline suzyj  Australia-Aboriginal
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Quote:
Originally posted by felixx
@suzyj
What do you think about 3 pairs on 4 ohms in this link:
http://www.turneraudio.com.au/solids...s1mosfets.html

The amp is meant to be used with above 4 ohm loads, but will tolerate normal home use with loads down to 2 ohms when the power is unlikely to average high levels.
That would frighten me. I think it falls outside the SOA.

It's an interesting amp though - I'll bet the schematic would work a lot better if he connected the feedback loop up

I really disagree with his rationale for ditching the JFET input stage. I reckon it's one of the nicest bits about Tilbrook's topology. My 100W amp (with its dual JFET input stage) manages 12 nV/sqrtHz input voltage noise. I'll bet his is tens of dB above this.

Also, the high input impedance of the JFETs lets me completely do away with the capacitor in the feedback path, and DC couple the whole box and dice. It makes for some impressive thumps at power on and off, but is well worth the trouble, I reckon.
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Old 4th August 2007, 06:32 AM   #18
AndrewT is offline AndrewT  Scotland
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Hi Suzy,
Quote:
My 100W amp (with its dual JFET input stage) manages 12 nV/sqrtHz input voltage noise. I'll bet his is tens of dB above this.
could you remind this wally where to find your thread?
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Old 4th August 2007, 09:35 AM   #19
suzyj is offline suzyj  Australia-Aboriginal
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Quote:
Originally posted by AndrewT
Hi Suzy, could you remind this wally where to find your thread?
It's at

ETI 5000 MOSFET Power amp .

I've also got a web page talking about it, at http://www.littlefishbicycles.com/poweramp/.
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Old 4th August 2007, 12:09 PM   #20
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SUZYJ

Was this screen-shot of the 1kHz sim performed without the low pass output filter?

Click the image to open in full size.

When measured the noise of the amplifier did you have the 400Hz filter of the SG505 switched in?
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