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Old 5th March 2007, 09:02 PM   #1
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Default F4 power amplifier

http://www.firstwatt.com/f4.html


Last edited by Variac; 31st March 2011 at 09:29 AM.
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Old 5th March 2007, 09:17 PM   #2
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Quote:
Originally posted by Babowana
Thanks. I was waiting for this, without sleeping.
But, I could not open the web site -- problem on my side.
I will send e-mail to Lee for a copy.



if you have problem ,just say-I'll send it to ya
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Old 5th March 2007, 09:21 PM   #3
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Quote:
Originally posted by Babowana
Again, thanks for the help.
But, the server is blocked here for certain reason I don't know.

I will try to get it from Lee . . .


just sending to ya
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Old 5th March 2007, 09:26 PM   #4
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Quote:
Originally posted by Zen Mod


just say-I'll send it to ya

Hi Choky,
Yes, I need your help for one copy to my e-address. Best Regards
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Old 5th March 2007, 09:26 PM   #5
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Quote:
Originally posted by Babowana



Hi Choky,
Yes, I need your help for one copy to my e-address. Best Regards

shrinked and sent
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Old 5th March 2007, 09:36 PM   #6
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Oh dear, i'm having F4-X images on my retina.
Welcome back, Master.
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Old 5th March 2007, 10:41 PM   #7
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hehe
1 hour without single post.................
seems that someone practice reading.............mumbling "how many bloody IRFs I have in my drawer........oh....why 9240?............."

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Old 6th March 2007, 12:08 AM   #8
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Will this amp be offered commercially? If so how much?

Pretty cool!

When does te group buy start for boards?

-David
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Old 6th March 2007, 12:28 AM   #9
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F4!!! a very attractive circuit. Mmmmm… first time I see Nelson using a TL431…interesting application for that 3 legged bug.

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Old 6th March 2007, 12:50 AM   #10
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In an attempt to short circuit the inevitable questions:
--Yes, you can increase the bias as long as you have sufficient heat sinking/power supply/etc.
--Yes, you can decrease the bias.
--Yes, you can substitute the usual MOSFETs for the IRF outputs.
--Yes, you can substitute the input JFETs, but the field of candidates is much more limited.
--I don't have the datasheets for the input JFETs with me at the moment, but I don't think you're going to want to increase the rail voltage much. The outputs can take it, but the inputs can't. If someone knows where to find 100V low noise, complementary JFETs with reasonable current capability, I'm all ears.
--Yes, you can decrease the number of output MOSFETs, but watch the heat dissipation per device.
--Yes, you can increase the number of output MOSFETs, but bandwidth and distortion will suffer as a result--though not fatally.
What'd I miss?

Grey
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