F1 Service Manual

[Nelson Pass]

The draft of the First Watt service manual is posted at

www.passlabs.com/np/F1_SRV_MAN.doc

and you have an opportunity to see it and offer corrections
or comments before it goes up officially at FW.

It's a 5.4 M doc file, so some of you dial-up guys might want to
set the time aside for it.

😎

/pass/: just got his wine shipment from David Berkeley, and
has to go now.

 

[gl]

Thank you sir.

Regards,
GL

 

[apassgear]

Thankyou Nelson 😀

Even if I did not read in a detailed way it's a very usfull Manual for us DIY's including a set of graphs!!!!

I'm sure that many of us will be tempted to build this outstanding amp specially those fullrangers.

We appreciate you!!!!😎

 

[jh6you]

I trust you . . . 🙂

Don't be upset please . . .
Just printed it out . . .
Will read it on the plane . . .

Enjoy your wine!

Best Regards
jH

 

[Blues]

Thanks, Nelson...something new to learn.

 

[eLarson]

How would you like the feedback? I can edit the doc and send it back somewhere. Or should I just go page number and line number?

 

[dieringe]

.DOC?

could probably someone convert this to PDF?
I don't have and I don't want Word.

thanks
m.

 

[PRR]

convert this to PDF? I don't have and I don't want Word.

F1_SRV_MAN.pdf, PDF, 2 Megs, unauthorized

Please right/long-click and Save-As to your machine; it is less load on my poor server than you all reading on-line.

Mr Pass, if you object, or issue a new version, ask the moderator to edit-out this message, and drop me an email.

 

[Raka]

Thanks Nelson.
I'm now with the BOM, and will build it ASAP


PD : I suppose Fostex and Lowther are as happy as me at the moment.

 

[lumanauw]

Very nice schematic 😀 I cannot guess it will be like that.

Mr. Pass,

Do you insert each component and solder with your own hands?

 

[wuffwaff]

Hi,

very nice! Thanks. I will learn a bit more from this one.

I found one small mistake on page 7 "placing resistance across R27 or R29 depending on the polarity of the offset"
should probably be "R27 or R28"

William

 

[lumanauw]

This design must be rock stable 😀

There are 2 zeners for protection at input. Somewhere I read that zeners that biased with low current can make noise. Does it make noise here?

 

[peranders]

convert this to PDF? I don't have and I don't want Word.

F1_SRV_MAN.pdf, PDF, 2 Megs, unauthorized

... have you checked www.openoffice.org works pretty good in most cases and is free and also nice looking.

 

[dieringe]

www.openoffice.org

I don't really want it, too much bloat...

thank you, PRR.

you also see that the PDF file is less than half the size!

m.

 

[Zen Mod]

if Master don't mind:
http://choky.on.neobee.net/page6.html

look for pdf with 599 KB


cheers!

 

[dieringe]

pdf with 599 KB

🙂

 

[jacco vermeulen]

Do you insert each component and solder with your own hands?

You do not half realise how funny you are, Lumanauw.

To quote Python:
That's not a service manual, it's a 'build it yourself' instruction.
Greatly appreciated, Mr P.

 

[AudioFreak]

To quote Python:
That's not a service manual, it's a 'build it yourself' instruction.
Greatly appreciated, Mr P.

Couldn't of said it better myself.

 

[Joe Berry]

Thanks for sharing, NP! A couple of other minor notes:

On p.7, the statement that the drain of Q1 operates at about 3V should instead refer to Q7, I think.

Also, in the amplifier schematic, I believe that R20 should go to the + supply rail, not to the right output terminal as shown.

Several nice touches here, if I may be so bold. I especially like the dual use of thermistors as inrush current limiters and line voltage jumpers.

 

[Nelson Pass]

There are 2 zeners for protection at input. Somewhere I read that zeners that biased with low current can make noise. Does it make noise here?

The zeners are not in conduction, so they don't make noise.

BTW, thanks everybody, especially Grey for the corrections.
Desmond is posting a pdf file, but it's still huge - I couldn't get
pdfwriter to make it small and still retain the detail on the
board layouts.