F3 and F4 Clone PCB Reissue group buy, also F5 PCBs

[Peter Daniel]

CMF50 is 0.25W as you can check here: http://dkc3.digikey.com/PDF/C091/P1890.pdf

 

[adn6244]

ok. I guess 1/4W is out of stock. I'll get the cmf55 instead. Thanks for the help.

 

[AlanElsdon]

LU1014's in the UK

Anybody have a couple of LU1014's in the UK for my F3 Build?

Hi - I have ordered 10 of these and they are on their way (from Singapore) - obviously I will not need all of them so when they arrive I will let you know and if you are still without then I can let you have a couple.

Alan

 

[chatziva]

Re: four F5 pls

Peter

Can you email me a paypal request for 4 off F5 boards please ?

As for shipping costs, I am in the UK.

Thanks
Evan

Peter,

I got them today, so fast!

great quality thanks

regards,
Evan

 

[rigma]

I am building a pair of SE Mono F4's and would like opinions.

I have 2 pair of the Conrad Heatsinks from the group buy.

Would mounting 3 Mosfets per heatsink and running a higher bias current to get 50 deg C be better than all 6 Mosfets on 1 heatsink at a lower current?

What bias current would each allow for.

rigma

 

[samsagaz]

will other cap than P6577-ND CAPACITOR 15000UF 25V ELEC TSHA works better on this AMP?

i want to order 2 brands/models to test the diference!

 

[Pocoyo]

F5

Yesterday I installed Caddocks MK132 in place of Mills feedback resistors. I used 4 x 150R per board, which gives slightly more gain. The sound seems to be less forward and maybe a bit better bass, but nothing really major.

I receive your board Peter, Excellent boards !

Can you tell us what resistor you use in F5 boards ?

Thank you

 

[rhysh]

Are there any F4 Boards Left?

 

[Peter Daniel]

Plenty of F4 and F5 still left.

 

[vonfilm]

Has a F4 BOM been posted? If so could someone kindly post a link?

 

[Peter Daniel]

.

 

[AlanElsdon]

F5 BOM check

Peter,

Just starting to put the F5 boards together and noticed that the BOM does not include any small caps for the psu board and checking your photo it seems that you do not populate them. So is it just the four large caps plus either 4 or 8 resistors (for 5W or 3W versions) on the psu?

Thanks

Alan

 

[Peter Daniel]

..

 

[vonfilm]

Peter,
Are the parts in red on the second attachment an update or correction?

 

[Tea-Bag]

Peter,
Are the parts in red on the second attachment an update or correction?

Those are update to the original circuit. Nelson changed it later on. These values will work more better.

 

[Peter Daniel]

Re: F5 BOM check

Just starting to put the F5 boards together and noticed that the BOM does not include any small caps for the psu board and checking your photo it seems that you do not populate them. So is it just the four large caps plus either 4 or 8 resistors (for 5W or 3W versions) on the psu?

Indeed, there are no small caps on the amp board, and I don't see a need for any additional bypasses, but I mount my electrolytics directly on amp board 😉


The picture also shows what resistors I'm presently using.

 

[Peter Daniel]

That assembly will be mounted between two tall heatsinks.

 

[AlanElsdon]

Peter,

So two capacitors per channel - what look like Caddocks, Mills and Rikens resistors, but.... how do you attach the output devices to the heatsink - it seems that they must be mounted near the edge of the heatsink.?

So is there anything left on the capacitor board?

Would you be using the copper bar then as your star-ground?

Alan

 

[Peter Daniel]

There are two more caps on the other side, as to resistors I used whatever I had available. I will be using only rectifier section from capacitor board. The copper wire bridging the caps will be indeed the star ground.

 

[AlanElsdon]

just missed your second post

Peter,

So that is one channel? If so then I take it the caps at the back are also attached to that one board?

Yet again it looks like a work of art in the making.

Alan