UcD like topology amp.

[luka]

Hi

Sweet, I hope you will show copy of that article

 

[Bender.ru]

some new pics:

Clip 1kHz@6.5Ohm, 20V*200nS*div. PS: 35V per rail.

 

[Bender.ru]

20kHz@6.5Ohm,
output: 10V*10uS*div

ps: sorry for low quality pic 🙁.

 

[Bender.ru]

20kHz@6.5Ohm,
output: 20V*10uS*div, rms~50w.

 

[Bender.ru]

THD_vs_level (1kHz), no load connected 😀 😀 😀.

0db 76V p-p.

 

[Bender.ru]

thd_vs_level, 1kHz@6.5Ohm,
0db: 76V p-p.

Seems to me that it's not a limit 🙂

 

[Pafi]

What about at 5 kHz? I guess it's not much worse.

 

[Bender.ru]

thd_vs_level, 5kHz@6.5Ohm,
0db: 76V p-p.

 

[Bender.ru]

Minimum thd:

 

[EnvisionAudio]

It's not a design on paper, it's a complete working system with complete PCB layouts and magnetics specifications. The first prototype was installed in a motorbike 3 months ago and it has been working flawlessly since then. An article on this motorbike and the amplifier is about to be published in a Spanish car audio magazine soon. Now I'm being asked for more prototypes and more features 😉

My point is: You have a working prototype but it will not fit a heatsink I choose. So, in reality, it is a design on paper with a working prototype. I'd still need to layout a new PCB to fit my needs. I can spend a lot less money and a little more time designing my own. I just feel the flat rate is unacceptable. For example, another design I license requires I pay a percentage per unit sold. This is more reasonable and affordable. Its designer is very well known in the audio amplifier industry (and posts here with regularity) and can demand his quality at (nearly) any price.

 

[Bender.ru]

Special for even harmonics fans:

55W@6.5 Ohm ( 1/2Pmax )

 

[acid_k2]

well done, Bender.ru!

3th an 7th harmonics is really better than the first prototype....

Have you worked on layout only, or have you changed some other parts?

 

[Bender.ru]

Not only pcb was improved, thd level decreased thanks to schematic modification.

 

[Bender.ru]

new thd_vs_level plot (0db - 110W@6.5Ohm):

 

[luka]

Hi

Impressive 🙂

 

[Bender.ru]

New thd figure:
0db: 76V p-p ( ~110W @ 6.5Ohm)

 

[Bender.ru]

Hi all.
previous plot was incorrect, caused by my mistake in measuring procedure 🙁 .... so experiment to be continued 🙂

 

[luka]

Hi

What did you do wrong?

 

[Bender.ru]

i made one mistake during measurement software setup,
here is real thd figure vs level for 6.5Ohm load.

 

[Eljo]

Hello Bender.ru

Very interesting project. You make me a little bit impatient regarding schematic 😀

Have you already measured power
consumption in standby mode (no input signal)?

What type of comparator do you use on input of
IRS20955?


Greetings
Eljo