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Old 1st August 2012, 12:37 AM   #21
The Dastardly Dad of Three
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Cool stuff - congrats!

I think you don't need the caps on the outputs - just connect the load to the junction of v2 n v1 like post 11.... wonder if you tried that and had probs?

For the thermal tracking n bias, easiest is to use lateral fets ( so no thermal tracking needed) else for the parts you are using, the pass f5 article shows an elegant solution using a thermistor.
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Old 1st August 2012, 12:57 AM   #22
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Thanks kasey197. I didn't try hooking the speaker to V2/V1. For some reason it made me nervous, not sure why, but I will try it. And thanks for the F5 tip.

Tom
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Old 20th August 2012, 10:12 AM   #23
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Quote:
Originally Posted by tom42107 View Post
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
Hi
just back from hollidays
indeed, you have to put vbe multiplier instead of R6,7
I will post the proposition later/tomorrow
cheers
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Old 21st August 2012, 09:55 PM   #24
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Thanks padamiecki. A visual would be really helpful for me.

Tom
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Old 22nd August 2012, 07:46 AM   #25
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Quote:
Originally Posted by tom42107 View Post
Thanks padamiecki. A visual would be really helpful for me.

Tom
this is my proposition:
BD139 on the heatsink
R6 = 120k + 50k precision pot in series
play with R1 to set offset (2 ohm 1-2W noninductive resistors in parallel to set ~0.6 ohm)
do not expect it will sound better than std EFPP
the only one advantage is that you do not have to use insulators during mounting trans on the heatsink.
forgive to rubbish original thread with this proposition, I should set another thread...
in the next post I will send ltspice file and this will do...
Attached Images
File Type: jpg sch.jpg (299.4 KB, 127 views)
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Old 22nd August 2012, 08:18 AM   #26
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fourier looks worse...
Attached Images
File Type: jpg fourier 15Vpp.jpg (292.9 KB, 113 views)
Attached Files
File Type: asc inv foll 2409240 vbe.asc (3.7 KB, 9 views)
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Old 22nd August 2012, 08:55 AM   #27
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but this one with laterals should work from scratch (play with R1 to right offset):
laterals have negative temperature coeff, should be not thermal runaway.
fourier 15V pp looks amazing
Attached Images
File Type: jpg four15Vpplaterals.jpg (294.6 KB, 100 views)
File Type: jpg inv lateral.jpg (295.4 KB, 104 views)
Attached Files
File Type: asc inv foll 1056 162.asc (2.9 KB, 11 views)
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