UCD 25 watts to 1200 watts using 2 mosfets

[Ouroboros]

companies CROWN & Crest Audio they are not supporting self osc UCD for PA application

RGDS
Manoj

Well no, I'm sure they are not. Are they prepared to pay Philips/NXP for a UCD licence, or to comply with Philips/NXPs requirements for licence-free use of the technique?

 

[Dimonis]

you can still test your amplifier by using substraction.

Yea , something like that , first need to make a good pre-amp , because my amps have gain=10 , the output of the soundcard is'nt enough.

 

[Dimonis]

Self osc. UCD is not good for Higher WATT (above 200W).It will create lot of problems
ie. Heat,Noise & high Start up Current

WOW above 200W
And that do you recommend ? What type of feedback?

 

[Dimonis]

normally we are using osc=300 KHz for good THD Better for 500 KHz

from LM4651 & 4652 Notes .

Why you can't understand THD not only depends on frequency , more on deadtime.

 

[CPX]

Dimonis... self osc ucd can give 10kw if you want.
Make some tests without preamp..use my gain 10 2/3 power divider schematic that i posted a while ago.

 

[Dimonis]

self osc ucd can give 10kw if you want.

I don't doubt , tell this manojtm

 

[norazmi]

Dimonis... self osc ucd can give 10kw if you want.
Make some tests without preamp..use my gain 10 2/3 power divider schematic that i posted a while ago.

absolutely right, CPX can u post again optimum pre-amp for ucd? i want to improve gain with my discrete ucd , wanna see if there is lot improvement with preamp and without it, i`ll report the result here after..

thanks.

 

[norazmi]

I don't doubt , tell this manojtm

u already told him many time before,

 

[norazmi]

pssttt... Dimonis, wanna see video exercusion test with parallel mosfet again? hihi

 

[manojtm]

Hi all
sorry for troubling all of you
thanks CPX & Dimonis
word from Apex :
We always must made so many compromise, and never made best amplifier we can. Never can be made best amplifier, nothing is perfect.

RGDS
Manoj

 

[manojtm]

Hi all
CPX pls provide good schema for ucd

87 to 90% Eff. is good one for me
bandwidth @30KHz
Gain = 65 to 70dB
THD = .001% for 1W

RGDS
Manoj

 

[Dimonis]

We always must made so many compromise, and never made best amplifier we can. Never can be made best amplifier, nothing is perfect.

Yea , but we must try!

 

[norazmi]

special video bass test for Dimonis

another ucd totem pole buffer test, hard test bass low frequency and dummy test with 2 pair mosfet. - YouTube

 

[manojtm]

Hi Dimonis

PLS SEND ME T106-2 CORE; IS IT POSSIBLE TO SEND ITEM TO INDIA???
I HAD ONLY T38-26(YELLOW WHITE)

RGDS

MANOJ

 

[norazmi]

manoj u can order it from amidoncorp.

 

[manojtm]

Hi all

completed my PCB and waiting T106-2 core,before it comes i wound a T38(i think its T37)yellow white core pls check my photo

 

[CPX]

manojtm:
What i posted a while ago was a divider for measurering distorsions not a preamplifier schematic.
I do not have a schematic with your requirements but irs2092 cames close to THD 0.07% sometimes if done with 2 transistors only.60db means gain 1000..have you misspelled.
Use cut ferite core for testing..the yellow white one is disaster for class D..
I am sad to see that you made the board that i said not to do because it is bad...

norazmi:
You said in one of your clips you improved THD...how is that..you didn't even measure it..

 

[andrewlebon]

hello

hi
greetings just want to ask if T106_2 IS the best core suited for dclass a picture of bridged ucd on the left is a core of SENDUST MATERIAL its cool very
cool yellow core on right amp gets warm so before i order t106_2 is there any
better suited core
warm regards
andrew lebon

 

[CPX]

Yes..there are many cores you can use:red(t106-2); red/black(t106-14); blue/yellow(t106-17);yellow(t106-6); .

Iron Powder Toroidal Cores (for resonant circuits)
Micrometals, Inc. - Power Cores

 

[Dimonis]

special video bass test for Dimonis

another ucd totem pole buffer test, hard test bass low frequency and dummy test with 2 pair mosfet. - YouTube

Thanks , but i feel it a litbit mockery to use a subspeaker without enclosure