This is a guide to building a F4 using my boards, but you may be able to find some useful information here even if you use other boards.

The boards are based on the schematics from Nelson Pass's FirstWatt F4. You can get the service/user manual here: First Watt: Products: F4

You might want to check out the GB thread here: http://www.diyaudio.com/forums/group...gb-f4-pcb.html

PCB
Here is a picture of the pcb.

There are still more available and you can order them from my site GB order page for cviller

Errata
There is a trace error around R22. I have cut the traces on most of the boards I have sent - and the rest of the batch will be cut before I send them out.

These are the cuts which needs to be made:


And the green lines indicate where a connection must be made:

This can be done...

diyaudio.com is a good place and this is my effort to raise money for the service.

I'm offering 4 pcs. of totally free pcb's of my diamond buffer SSB01 to all donating diyaudio members will get this without any charge.

Contact me via email from diyaudio (this is important) since then I can easily see that your are a member and I can also check if you have donated. Don't forget to write down your address also. Please write it so I can cut it out and put on the envelope.

Please notice that the pcb's requires two small patches (wires) and the version of the pcb is revision 0, red pcb's.

Schematics, pcb layout
BOM


The 25 first gets 4 pcs. of my SSB01 for free, even the shipping
1 Luke, shipped 2010-02-12
2 Boilermakerfan, shipped 2010-02-12
3 tcpoint, shipped 2010-02-12
4 khaho, shipped 2010-02-12
5 HiljaisuudenMeri, shipped 2010-02-12
6 Ed LaFontaine, shipped...

I'm sure you'll know about a forum where they call this forum "The Pub"? From time to time I read this forum and for those who don't know, the forum founders were a bunch of banned people from this forum. Some of them are rather decent but a few individuals must cry out their contempt. Why does it have to be that way?

Example:
Mr X says this about my forum:
The forum software doesn't reveal a thing of the user identity such as IP numbers. I have clearly stated that the forum is mainly for support and you can also see that many of the users use the same nick as in other forums. Mr. X isn't a moderator at my forum, therefore he can't see IP numbers, not even a clue what they might be.

Mr. X is a grown up person which I'll believe has a working social life....

My brother gave me a Pass B1 board.
Now that he has his working I thought I would look at mine.

I am going to use this space to record all of the links and tricks. Some of the links will be very basic.

http://www.national.com/ds/LM/LM317.pdf

http://optimus.meleeisland.net/downl...s/mc78xxct.pdf

http://www.quasarelectronics.com/kit...c-kit/3060.pdf


http://www.tubecad.com/2007/06/blog0109.htm

http://www.tubecad.com/2007/07/blog0113.htm

http://www.tubecad.com/2008/11/blog0151.htm

http://www.wenzel.com/documents/finesse.html

http://www.borbelyaudio.com/psshunt.asp

.

hi,
im new to this amp building thind and im having difficulty.
ive bought a few parts and im just having difficulty with the power supply, ive got a 240V 50Hz input to 24V AC max 3A output transformer, however it has only 2 leads and is not centre tapped like i orignally planned or was told. its model is the M2158L transformer and i was looking for some help on how to wire it up and use it in my amplifier.

As promised, I would make a guide to the boards and in particular to the additions I have made to the F5. I decided to do this in the blog, because then you can give me comments which I can use for improving the doc. However I'm not done at all, but I thought it would be nice to give you access to the BOM I have made.

IMPORTANT: Before you start stuffing your boards, you must read the manual/article written by Nelson Pass – available for download on the First Watt website (First Watt: Products: F5).

PCB
Here is a picture of the pcb.

There are no more boards available, but you can order F5 boards on the diyAudio store.


Schematics

Optionality
With the addition of optional extra output mosfets and cascoding, there are many possible ways to build the amp. Here I'll try to explain some of them.

Stock F5 example
Greens are populated and...