WTB: F4 PCB boards

[Peter Daniel]

I received the new batch of F4 boards today and all outstanding orders will be shipped tomorrow (Clayton, St. Perth, Bonner Springs, Rotterdam, Eugene, Richmond Hill)

 

[Peter Daniel]

Please note that updated schematic of F4 is now posted on PassLabs site (some resistors value changes): http://www.passlabs.com/np/f4-power-amp.pdf

I also have few sets of semis available. One set is good for stereo amp and includes:

6x IRF240
6x IRF9240
2x2SK170
2xSJ74
2x TL431
4x1N4736 (6.8V Zener)
4x1N4148

IRF devices are sourced from DigiKey and matched to 0.01mV at 500mA. A set is CAD$65, shipping and fees included, 7 sets are available.

I also have some stock of 0.47R, 3W Panasonic resistors at $0.50/pc

 

[korben69]

Hi Peter,

Count me in for 1 full set + 20 x .47R/3W = CAD$75.
Same account as usual ?
Regards.

 

[Peter Daniel]

Yes.

 

[Peter Daniel]

As to resistors, there are 12 resistors needed for two amp channels and 8 per PS board (4 each side) as pictured:

 

[korben69]

Paypal's done.
Thanks.

 

[matejS]

I received the new batch of F4 boards today and all outstanding orders will be shipped tomorrow (Clayton, St. Perth, Bonner Springs, Rotterdam, Eugene, Richmond Hill)

[/B][/QUOTE]

Please note that updated schematic of F4 is now posted on PassLabs site (some resistors value changes): http://www.passlabs.com/np/f4-power-amp.pdf

I've ordered PCBs on 18th and I guess they where shipped. I am wondering which version they are - 11/8/06 or the latest 6/4/07? As I see it the changes are not only resistor values.
Why changes? Any change on sound? Previous power rating was 40W now it is "only" 25W (bias from .53 to .43). Hmmmmm

Cheers,
Matej

 

[Peter Daniel]

The boards are all the same, it's just few resistors value have been changed in original schematic as noted in this post and attached BOM: http://www.diyaudio.com/forums/showthread.php?postid=1263192#post1263192

All the boards I shipped had schematc marked r0 4/17/07 included. There seem to be a new schematic now, marked as r0 6/4/07.

 

[matejS]

The boards are all the same, it's just few resistors value have been changed in original schematic as noted in this post and attached BOM: http://www.diyaudio.com/forums/showthread.php?postid=1263192#post1263192

All the boards I shipped had schematc marked r0 4/17/07 included. There seem to be a new schematic now, marked as r0 6/4/07.

Uuu, then I am one year behind. Great!

Thanks,
Matej

 

[PierreQuiRoule]

Peter

I will take two sets of semis, please - for two amps.
Thanks

Pierre

 

[Peter Daniel]

Got all the payments, all sets are gone.

Resistors still available

 

[José Humberto]

Hello Peter
I need 24 0.47R, 3W Panasonic resistors. Do you have all?
Thanks
Jose

 

[Peter Daniel]

I have at least 300 of those resistor left. Shipping is $5.

 

[José Humberto]

Count me one stereo set and 30 0.47R 3w.
Are 75$?

 

[jleaman]

I have at least 300 of those resistor left. Shipping is $5.

Can i buy some ? how much each ?

Jase

 

[Peter Daniel]

If José takes his 30pcs, I might be out of resistors as well. There was a large order from Germany that wiped them out

 

[Peter Daniel]

Can i buy some ? how much each ?

How many do you need? They were $0.50/pc

 

[marginwalker]

Hi Peter, i'm interested with Pans 3W too.
Just mailed to you.
Cheers,
Marco

 

[Jaac]

Peter where did you bought those panasonics 0,47 resistors ?

 

[jleaman]

Peter where did you bought those panasonics 0,47 resistors ?

Digikey.ca