200W MOSFET CFA amp

[dadod]

those are old, beefier versions of the classic laterals 2SK135/2SJ50

mlloyd1

In this case as those are laterals simpler amp is possible, like this one:
https://www.diyaudio.com/forums/solid-state/243481-200w-mosfet-cfa-amp-118.html#post5297290

 

[Onemangang]

You beat me to it mlloyd1

Thank you Damir. Seems i missed that one

 

[dadod]

The boards are in it's way from China, hopefully will be in my house next week and then I will send PayPal request payment via your PayPal email address.
BR Damir

 

[dadod]

The boards are in it's way from China, hopefully will be in my house next week and then I will send PayPal request payment via your PayPal email address.
BR Damir

Finally the boards are in Croatia at Custom office, hopefully next week at my home.

 

[dadod]

The boards are here.

Please PM to me your PayPal email address that I can send PayPal payment request, deps and fredlock missing.

The list:

ydrozd -----100W CFA 4 boards,-----PS regulator 4 boards—confirmed -PayPal mail OK
deps--------100W CFA 2 boards--------------------------------confirmed
Andreas B--100W CFA 2 boards,-----PS regulator 2 boards—confirmed -PayPal mail OK
fredlock----100W CFA 2 boards------PS regulator 2 boards—confirmed

Damir

 

[tjencks]

Happen to have any balanced boards left ? I'd like 6.

 

[dadod]

Happen to have any balanced boards left ? I'd like 6.

I suppose you mean small balanced input boards for 200W version, no I don't have any. Have you built 200W CFA with no balanced inputs?

 

[dadod]

The boards are here.

Please PM to me your PayPal email address that I can send PayPal payment request, deps and fredlock missing.

The list:

ydrozd -----100W CFA 4 boards,-----PS regulator 4 boards—confirmed -PayPal mail OK
deps--------100W CFA 2 boards--------------------------------confirmed
Andreas B--100W CFA 2 boards,-----PS regulator 2 boards—confirmed -PayPal mail OK boards sent
fredlock----100W CFA 2 boards------PS regulator 2 boards—confirmed

Damir

I would need the receivers address as it looks PayPal does not shows it any more.
BR Damir

 

[Onemangang]

VAS transistors

Hi

It seems it's getting harder to source the good parts. when i look at the usual hardware pushers websites, most only have D versions of ksc3503/ksa1381.
Do the D types have high enough hfe ?

/Jørgen

 

[dadod]

Hi

It seems it's getting harder to source the good parts. when i look at the usual hardware pushers websites, most only have D versions of ksc3503/ksa1381.
Do the D types have high enough hfe ?

/Jørgen

For the drivers probably, not sure for VAS never tried in real amp.

 

[dadod]

100W CFA

This is last revision of the 100W CFA. Attached amp schematic, PS regulator schematic, amp BOM, PS regulator BOM and layout photo of both boards.
One PS regulator could be used in an amp in stereo configuration, but if used in mono or dual mono skip half (do not mount) of loudspeaker DC voltage detection (Q12, Q112, C5, C105, R19, R21, R119, R121).
Damir

 

[fredlock]

On the PS regulator, the speaker connection is not labelled, which I assume beside the Q12. I just have to trace it to make sure.

 

[fredlock]

I mean Q11 and Q111. I know you're a busy guy but I wish you could have made a formal document on the build, so we don't have to go to the postings.

Thanks for sharing this wonderful amp.

Fred

 

[dadod]

On the PS regulator, the speaker connection is not labelled, which I assume beside the Q12. I just have to trace it to make sure.

Yes it is, LR (loudspeaker left) LR (loudspeaker right).

 

[dadod]

I mean Q11 and Q111. I know you're a busy guy but I wish you could have made a formal document on the build, so we don't have to go to the postings.

Thanks for sharing this wonderful amp.

Fred

First post has the links to useful documents, like no. 3, no big difference between old version and this last one.
Damir

 

[dadod]

Yes it is, LR (loudspeaker left) LR (loudspeaker right).

Sorry LL (loudspeaker left)

 

[fredlock]

Thanks Damir.

 

[Andreas B]

Thank you Damir.I have some questions,not now,maybe by PM

Regards
Andreas

 

[fredlock]

Hi Dadod, what courier did you use to ship the boards?

 

[dadod]

Hi Dadod, what courier did you use to ship the boards?

Croatian post. Hrvatska pošta - Praćenje poštanskih pošiljaka - Track&Trace