F5 power amplifier

[Nelson Pass]

Originally posted by dhole
so to clarify its the FQA12P20 , and can this be used with the irfp240 without cahnges to the circuit ?

It works fine. It was the first channel made, and it works equivalently
to the all-Fairchild version.

[dhole]

Cheers

Thanks for the info, I always try and research before I ask questions I guess I didnt dig enough.

dave

[metalman]

Originally posted by MJL21193
Laser transfer, muriatic acid+ hydrogen peroxide etch, sprayed soldermask, double sided 140mm x 70mm board.

What product are you using for your soldermask?

Terry

[dhole]

Ok so here goes. I am starting a mini gb for FQA12P20 in UK/EU Only. please see here .

Mini UK/EU BG for FQA12P20

[Dennis Hui]

I figure I'd see if there's interest for a GB for non-EU countries.

Non-EU mini BG for FQA19N20C and FQA12P20

Cheers,
Dennis

[Nicola]

Hello, I've been reading this thread hoping to find some comments on how the F5 compares to F3 (JFET) or F1/F2 for example. Has anybody already comment on it ? What are the tech spec's for the F5, thd, power, freq spectrum, damping, etc ?

[Dennis Hui]

Originally posted by Nicola
Hello, I've been reading this thread hoping to find some comments on how the F5 compares to F3 (JFET) or F1/F2 for example. Has anybody already comment on it ? What are the tech spec's for the F5, thd, power, freq spectrum, damping, etc ?

This quote from the F5 article may interest you:

"This is the lowest distortion yet achieved by either a Zen or
First Watt amplifier, descending to 0.001% below 1W."

[Nelson Pass]

This information has been partially presented in previous posts,
however the full article will be going up on www.firstwatt.com
probably this next week.

[Nicola]

Originally posted by Nelson Pass
This information has been partially presented in previous posts,
however the full article will be going up on www.firstwatt.com
probably this next week.

Thanks Mr Pass, look forward to read it, hopefully there will be soon also article like the 6moons or by J Lowther to get a taste of the quality and listener differences between the several models. But may I ask you how would qualify / compare F5 to F1 or F3, if I may.
By the way, do you plan to build & sell some through RenoHifi ? (http://www.diyaudio.com/forums/showt...97#post1493697)

Regards

[EUVL]

For regular updates of the 1st EU Group Buy of Fairchild MOSFETs now closed, please follow the Group Buy thread :

http://www.diyaudio.com/forums/showt...44#post1495444


Thanks,
Patrick