50w Single-Ended BAF2015 Schade Enabled

[Zen Mod]

well , I'm used to overkill , so no regs

in case you want some , include cap multiplier , as in F3 (Q5, C5, R19,R20,D1)

 

[juanitox]

mine is 100K (10mh 160mohm hammond 159ZJ) 100K no noise

 

[dantwomey]

C1,C2, and C3 are actually 22,000uF. The PS Designer doesn't seem to report them well.

Anyways I'm going down the old school road with a monster toriod and lot's of CLCLC.

Regards,
Dan

 

[dantwomey]

An accurate statement?

Class A amp power supply

Regulated (constant) voltage, not current.
All of the Nelson Pass class A amplifiers,
around 50W stereo, use a CRC unregulated supply.

https://www.diyaudio.com/forums/images/diy/store/board-documentation/P-PSU-1V30/P-PSU-1V30-schematic.pdf

Regards,
Dan

 

[dantwomey]

To get the ball rolling on this project, I'm seriously considering a couple of 60V ebay switchers.
I can get one switch mode power supply cheaper than the price of just one capacitor and I was thinking of getting 8 of those capacitors (not cheap).

You're right about the capacitors. Here's what I'm starting with,
4pcs NEW KENDEIL K01 22000UF 75V CAP AUDIO QUAD303 QUAD 405 UPGRADE NAIM!63V REP | eBay

Regards,
Dan

 

[dantwomey]

Thinking of resistor selection. 20W for R4 and R5?

Regards,
Dan

 

[Soundhappy]

Hello Dan

I have used for R4 equivalent made with two Futhaba MPC74 resistors in series
0.1R ( 5 watts ) + 0.1R ( 5 watts ) = 10 watt's of the power dissipation and is sufficent
and don't run too hot , bigger are always OK if not bulky

 

[Zen Mod]

P=Iq^2 x R

3A2^2 x 0R2=2W05 , so 10W as Okidoki , even dynamically when you count on twice Iq delivered to load

though 20W is better for sleep

 

[dantwomey]

So.............looks like R1 to R3 and R7 to R9 are 1/2 watt. R4 and R5 are 10watt and the sole survivor R6 is 3 watt.

Regards,
Dan

P.S. I wouldn't mind finding some CPCC10's. Nice and compact. Speaking of compact. These look nice too. TNP10SAR200JE Ohmite | Mouser Canada

 

[Soundhappy]

Question : do somebody have made photos of Mr. Pass IXYS Schade 50W and 2SK77B prototypes amplifiers
after talk at the BAF2015 show ?

 

[dantwomey]

So.............looks like R1 to R3 and R7 to R9 are 1/2 watt. R4 and R5 are 10watt and the sole survivor R6 is 3 watt.

Regards,
Dan

P.S. I wouldn't mind finding some CPCC10's. Nice and compact. Speaking of compact. These look nice too. TNP10SAR200JE Ohmite | Mouser Canada

Too bad someone didn't do a PCB. With the right components this could be simple, compact, and neat. Everything Father Pass looks for in a design?

Regards,
Dan

 

[Soundhappy]

Sir Mike Rothacher beautyful DIY example

BAF 2015 Coverage

BAF 2015 Coverage

 

[Soundhappy]

Too bad someone didn't do a PCB. With the right components this could be simple, compact, and neat.

CCS boards can be the similar concept but power stage pcb with Tokin SIT need design modyfications.

 

[dantwomey]

Sir Mike Rothacher beautyful DIY example

BAF 2015 Coverage

BAF 2015 Coverage

Yes, but I am a mere mortal compared to Mr. Rothacher. That's why simple designs have so much appeal.

Regards,
Dan

 

[dantwomey]

CCS boards can be the similar concept but power stage pcb with Tokin SIT need design modyfications.

I'm going old school all the way! Massive toroids! 5 Farads of capacitance! And in the end an class A amplifier that weighs more than a small car!

 

[Soundhappy]

Amp at 3.2A run HOT weight "" if stereo version make him on small wheels are not one extravagance

 

[Soundhappy]

5 Farads of capacitance!

5 Farads Too goood
Do You go with Kemet caps brand ?
https://www.mouser.fr/KEMET/Passive...MIlLLmveyb4wIVxRd9Ch1hLQdPEAAYASAAEgJCp_D_BwE

 

[analog_sa]

Some heavy duty bridge rectifiers
VBE60-06A IXYS | Discrete Semiconductor Products | DigiKey

Bought a few of these out of curiosity, but sadly, the cheapest Chinese bridges sound better to me.

 

[dantwomey]

Amp at 3.2A run HOT weight "" if stereo version make him on small wheels are not one extravagance

I have enough 'parts' to make a monster stereo amp!

 

[dantwomey]

Bought a few of these out of curiosity, but sadly, the cheapest Chinese bridges sound better to me.

Did you put a Quasimodo in front of them?