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My F4 Guide

Posted 11th February 2010 at 05:36 AM by cviller
Updated 2nd November 2012 at 08:11 AM by cviller

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.
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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:
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And the green lines indicate where a connection must be made:
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This can be done simply by having the leg of R22 go through the hole and to the side.

Schematics...
Attached Files
File Type: pdf F4R0.pdf (87.7 KB, 1389 views)
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Old

Free pcb's from me

Posted 10th February 2010 at 07:34 PM by peranders
Updated 22nd October 2011 at 12:36 PM by peranders

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...
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Old

Why are grown up people mean?

Posted 10th February 2010 at 01:58 PM by peranders
Updated 11th February 2010 at 03:13 PM by peranders

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:
Quote:
I know some other guy, from Sweden, who has several sockpuppets in his own forum.
He asks the questions about his own products and answers them.
Now beat this.
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....
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Old

Power supplies for B1

Posted 9th February 2010 at 07:51 PM by DougL
Updated 28th April 2010 at 06:44 PM by DougL

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
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Old

Some progress

Posted 4th February 2010 at 07:15 PM by Bas Horneman (Bas Horneman's diyAudio.com blog)

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Old

LM1876 power amplifier

Posted 3rd February 2010 at 11:09 PM by JozzaG

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.
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Old
Rating: 4 votes, 4.75 average.

GB F5 Guide (pcb version 2)

Posted 3rd February 2010 at 01:17 AM by cviller
Updated 14th February 2013 at 07:14 PM by cviller

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).

Detailed guide by Steve and Matt: http://www.diyaudio.com/forums/pass-...mentation.html

PCB
Here is a picture of the pcb.
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There are no more boards available, but you can order F5 boards on the diyAudio store.


Schematics
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Optionality
With the addition of optional extra output mosfets and cascoding, there are...
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Attached Files
File Type: pdf bom.pdf (50.9 KB, 4939 views)
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Old

B1

Posted 29th January 2010 at 07:58 PM by Cro maniac

I finally gathered some will to deal with my Pass B1 project. I drawed the board in Protel and bought the components at Farnell almost 6 months ago, but never got time/mood/will to assemble it. Wednesday was my day off at work and I had nothing to do at home so I decided it is the Pass B1 day . I printed and made the boards, drilled the holes and lacquered them. Couple of hours later they were ready for soldering the components.
But hey, there is a bag full of 2SK170's that need to be matched prior to soldering ! I managed to get 3 matched pairs and I need only 2. Good enough
My version is the one with Salas regulator with R6 mod so I used the leftovers from matching in supply.
Now, everything is soldered and in place except input coupling 1uF caps and pot that I yet need to buy.

Now when it's nearly completed I don't sleep thinking how should the case for the preamp look like. I would really like to make it from wood.
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Old

Matching BJT's

Posted 27th January 2010 at 08:27 AM by Cro maniac

Yeah, my first blog entry !

I have spent whole day in matching output transistors for poweramp I'm building for a friend.
I found out that Vbe tracks gain pretty good (the transistors with higher gain have proportionally higher Vbe), so I think the painful matching of Vbe at various collector currents is pretty much useless because Vbe spread can be already seen in DC current gain.

If I think of Vbe tracking gain, it is good, because transistor that needs more Vbe will be less opened, but it has higher gain, so collector current will be more equal between devices.
I have 10 pairs of MJ21193 / MJ21194 and plan to use 4 pairs per channel.
Transistors are ordered directly from Onsemi and the NPN's all come from the same batch but PNP's are from 2 different batches and that can be clearly seen from measurements because there is a big mismatch in gain between the 2 batches.

Fortunately, the ones from the same batch are pretty...
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Old

Inductor Evaluation Help

Posted 27th January 2010 at 04:40 AM by audi0

[FONT="Verdana"][SIZE="2"]Over the last couple of years amongst other things, I have been playing around with T amps changing and upgrading components, noting changes etc. When I saw the ‘Inductor Evaluation Help’ thread by ICE_Mag it was of immediate interest to me.
I have read a fair bit about the audible effects of different inductor types used in these amplifiers, some people liking air core and others ferrite core toroids etc. so I registered my interest with the supplier.

It then occurred to me which of my amps (I had three T amps at that stage) would be the guinea pig for my trial; I pondered on this for a while thinking that although all were modified, they are all in a condition where they could be sold if they became surplus to my needs.
I therefore looked on eBay and saw an Hlly amp at the right price, so I bought it.

The inductors arrived, two each of three different sizes (all 10mH) hmmm I thought, how am...
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