50w Single-Ended BAF2015 Schade Enabled

[Michael Rothacher]

It may take a little more than 4V7, so leave yourself some upward adjustment room.

Looking good. 🙂

 

[Dennis Hui]

I don't know how nominal the 4.7V figure is, so I would do as Uncle Mike suggested.

 

[Soundhappy]

I don't know how nominal the 4.7V figure is, so I would do as Uncle Mike suggested.

small CCS plus 4 Green LEDs in series , then trimpot across them ?

It may take a little more than 4V7, so leave yourself some upward adjustment room.

Looking good. 🙂

Thanks Gentleman's for Yours councils.
Build autonomus bias psu with his own tramsformer is my choice.
I got LM317 who can work up to 1.5 A it's ok or need add current boost transistor for IXYS bias psu ?
Greetings

 

[Zen Mod]

no need

for bias circ 10mA is overkill

lm317 is too crude

use TL431 or something .......... better than 317

 

[Soundhappy]

Yes for TL431 solution 😀
Get small xformer on hand with two 12 V secondaires.
Are this circuit from CSX1 all i need ?
Schematic courtesy of Papa FW Diy thanks.

 

[Zen Mod]

what voltage you need ?

 

[Soundhappy]

what voltage you need ?

From 4V7 to ~ 8V
Thanks Mighty

 

[Zen Mod]

From 4V7 to ~ 8V
Thanks Mighty

 

[Soundhappy]

FRANK ZAPPA on The Steve Allen Show on Vimeo

Thanks ZM for the schematic

 

[Soundhappy]

Bias TL431 psu work fine 🙂
Time for signal path input transformer wiring

 

[Zen Mod]

xtal is for fun ?

 

[Soundhappy]

What is xtal ? Silver case 470 resistor.
Babelfish ZM TL431 version 😀

 

[WalterW]

Haha, I was also thinking: why on earth is there a crystal on the board 😕
But it is a exotic resistor...😀

 

[Zen Mod]

Soundwakoo

 

[Soundhappy]

Original Mr Pass schematic is perfect for Schade 50W.
The possible bias voltage starts from 4 V to 12 V.
Build this amplifier is enjoyable 🙂
SOT-227B package is handy: two sources, isolate electrically case.

 

[Michael Rothacher]

Yeah boyeeeeee, we're about to get some watts all up in here. 🙂

 

[Soundhappy]

Haha, I was also thinking: why on earth is there a crystal on the board 😕
But it is a exotic resistor...😀

Soundwakoo

Yeah boyeeeeee, we're about to get some watts all up in here. 🙂

Papa hockey puck WATT's

 

[Soundhappy]

Two lab psu's = 60V cook IXFN's with bias ~ 3A for few hours 🙂

 

[Soundhappy]

Tom Tom Club - Under The Boardwalk on Vimeo

Test all OK 😀

 

[Michael Rothacher]

C'est magnifique! 🙂