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Old 25th July 2012, 08:50 AM   #11
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Quote:
Originally Posted by Nelson Pass View Post
You can try using feedback to the primary like in
the F6 if you want to lower the output impedance
or use inerted follower like this
and
what is great
you can screw M1,2 directly to the heatsink without isolation
to prevent thermal runaway use VBE multiplier or diodes is a must
of course the input tr should have "voltage gain"
cheers!
PS wow, the 8th, 9th and the rest harmonics bellow -100dB with +-15VAC!!! must sound incredible, please play with ltspice file
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Old 25th July 2012, 08:59 AM   #12
The Dastardly Dad of Three
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cool thanks ! ... if youre referring to my thd results in post #4, just wanted to repeat that they are incorrect corrected measurements with the secondary feedback loop disabled (ie no R9, R10 and no caps) give me 0.27% thd (mostly low order stuff) @ 15v pk-pk and touches 1% THD @ 32 V pk -pk ...

not too shabby for such a simple circuit for 1% to come in at 75 W RMS into 6.8 Ohm load and 24V rails ... driving the sucker is a different problem though so I may have shifted the hassles downstream, but yes it does sound lovely so far!

I will try the follower design once I have exhausted what i can do here ... thanks matey
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Old 25th July 2012, 09:17 AM   #13
The Dastardly Dad of Three
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sorry i get it - you meant the spice results for the follower circuit you posted & sim- yes they are pretty amazing ! You got talent !!
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Old 25th July 2012, 09:20 AM   #14
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regards, Pawel
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Old 25th July 2012, 01:49 PM   #15
lhquam is offline lhquam  United States
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Quote:
Originally Posted by padamiecki View Post
or use inerted follower like this
and
what is great
you can screw M1,2 directly to the heatsink without isolation
to prevent thermal runaway use VBE multiplier or diodes is a must
of course the input tr should have "voltage gain"
cheers!
PS wow, the 8th, 9th and the rest harmonics bellow -100dB with +-15VAC!!! must sound incredible, please play with ltspice file
Why is there a wire (dead short) between output and ground in the shown schematic?
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Old 25th July 2012, 02:18 PM   #16
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Quote:
Originally Posted by lhquam View Post
Why is there a wire (dead short) between output and ground in the shown schematic?
it is inverted style source follower pp, the output is taken from the sources, not the drains
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Old 25th July 2012, 02:25 PM   #17
lhquam is offline lhquam  United States
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Quote:
Originally Posted by padamiecki View Post
it is inverted style source follower pp, the output is taken from the sources, not the drains
Oops, I missed that when I first looked at the schematic. Other than in circlotrons, I haven't seen the power supplies floated like that.
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Old 25th July 2012, 04:24 PM   #18
The Dastardly Dad of Three
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fascinating...... had me flumoxxed too !
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Old 26th July 2012, 05:35 AM   #19
The Dastardly Dad of Three
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pawel - reckon your crcuit is very interesting & worthy of a build ---- i'm tied up with the project above rite now but if you/anyone have time, would be great to see some test results and how it sounds ...
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Old 31st July 2012, 08:05 PM   #20
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Ok, so I just went ahead and built the schematic in post #11. I used IRF510 and IRF9510. No transformer input. Schematic below. I changed some of the resistor values based on what I had and added the two caps because I couldn't figure out how to hook up the speaker without them. I admit it, I got a lot to learn. I used a capacitance multiplier power supply that I've built for an upcoming JLH build. I started with about +-10v and ran up the volume. Out came music. Sounded pretty good. Fets started to get warm so I shut it down, screwed them to a heatsink and tried again. This time +- 12v. Again, music sounding good. I started to worry about thermal runaway (which I got from the padamiecki post) so I shut it down. That's where I stopped. Now I need to figure out how to implement Vbe multiplier or diodes like padamiecki recommends. It did sound good though.
Tom
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