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WTB: F4 PCB boards

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#541
jrebman said:
So Peter, do yu recommend another new thread be started for a second group buy, or what's the best way to go about this? Would this include just amp boards or PSU as well?

Any rough idea on what parts cost for a finished F4 runs?
Click to expand...

You can post here or start a WIKI page. PS boards will be also available.

The parts for two channels shouldn't cost you more than $100, plus transformer and chassis.
 
#542
Peter,

Thanks, this is looking really interesting. I'm already about 10% through the F4 thread and this looks like it will be a great amp -- bridged monoblock, or basic stereo to drive my Sapphire XLs.


Is there a parts list somewhere? I am asking because I'm blind and can't see the schematic to be able to make my own.

Is there provision on the PSU board for a CLC filter? Any guesses as to what the size of a finished amp would be?

I appreciate your patience as I come up to speed on all this, but I've always thought a unity gain buffer was really the way to go, but this one with no global NFB looks even that more interesting.

Thanks again,

Jim
 
#543
The schematic can be found here: http://www.firstwatt.com/downloads/f4_om.pdf

The parts list is attached. As the boards are based on original amp design, no CLC filtering option on PS board. Another reson is that I wanted to keep the size down, you can always attach inductors off the board.

Some parts were also listed here: http://www.diyaudio.com/forums/showthread.php?postid=1329905#post1329905

The finished amp size will depend on your chassis, heatsink need to be of reasonable size though. An example is my F3 monoblocks where I wanted to keep the size to minimum, yet still came out with 11 x 11 x 11" (stereo amp would be same size)

http://www.diyaudio.com/forums/showthread.php?postid=1254948#post1254948
 

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#547
#560
JoshK said:
I agree and I like the fact that I can provide, for example, a tube gain stage and use the F4 for current amplification only. This seems the most logical way to pair tubes and SS.
Click to expand...


Now that you mention it, a tube pre might be something I would experiment with--I've always been fearful of high-voltage. Does a tube preamp use lower voltage, or at least, safer voltages?🙂
 
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