UCD 25 watts to 1200 watts using 2 mosfets

[RX5]

norazmi,

if your up to DIYing the coil, you could also use an medium size E-E ferrite core(gap it at the center) say 1mm and wind your coil at the bobbin.. it helps to have an LC meter to measure inductance...

 

[Pafi]

Ferrite is good, but for high power (~1 kW) 1 mm airgap is not enough, 2 mm needed at least (with 2 cm^2 cross section).

 

[luka]

what if gap is on all legs, will this be a problem with amp? or is 1mm gap still small enough

 

[RX5]

EM radiation "leak" on the side leg/s ....

a compromise must be made for FEW turns && inductance && saturation... better if an LCmeter is at hand..

 

[Ouroboros]

I don't know about in your country, but here in the UK it is much easier to buy ungapped cores in small quantities. For prototyping I use these, and then cut-up pieces of old credit cards, or business cards to use as the gap spacers.

 

[luka]

yea, coz I don't see how I would make center gap at home and that it leveled and such

 

[norazmi]

norazmi,

if your up to DIYing the coil, you could also use an medium size E-E ferrite core(gap it at the center) say 1mm and wind your coil at the bobbin.. it helps to have an LC meter to measure inductance...

Yes i do that, im trying with EE and UU small and medium size, but from my ear why is iron material gives good on bass sound better than ferrite, or maybe i dont make correct winding on ferrite core, idk.. i just tried with gapped ferrite toroid too but its same as when use EE and UU core hmmm, any ideas? So far im using T106-26 toroid iron with 18 awg sounds good so far heat not too much can be touch even i`m playing loud at full volume with +- 50 vdc. No noise at all when using linear power supply, but be carefull when using offline smps u need to have good filter for it.

regards.
Azmi.

 

[RX5]

hi,

That is why an LC meter is needed to measure the inductance .

 

[nigelwright7557]

hi,

That is why an LC meter is needed to measure the inductance .

If you dont have a meter you can put a capacitor in series and apply a sine wave and see where it goes to a minumum.

Then yo ucan work out the inductance from:
L= 1/(4 * pi squared * c * f squared)

 

[RX5]

well, its 'simpler' to DIY an LCmeter (google)... thats what I have... I don't have a descent scope ATM

 

[QUINQUIN07]

Bonjopur, I return to the topic I made progress. I simulated the LTC software schematics Attached Files IR2110_UCD.zip (421.1 KB
But that does not give me a correct answer!
my questions
someone does make this amplifier
which simulate the schematics on LTC.
Thank you for your cooperation.
Greetings

 

[ionutzxpo]

hi quinquin07 i built the amp and it performs great http://www.diyaudio.com/forums/class-d/166214-ucd-25-watts-1200-watts-using-2-mosfets-11.html

 

[klm1]

Hey!

Won't let me click on attach pdf, can some one help? Thks!

 

[paul_usa_22]

hello savu.i want to discuss with you in private if it's possible.thanks!

 

[qsa]

is there any DC at speaker output or is this problem solved ?

 

[QUINQUIN07]

Class D

Bonjour, je vous remercie pour votre réponse, mais je copie les schémas de simuler sur "LTspiceIV de la technologie linéaire, mais je ne peut pas tourner, est-il une erreur?
Je joins les fichiers.
Salutations.

View attachment Ampli classe D.zip

 

[planet10]

Hello, thank you for your reply, but I copy the patterns to simulate on "LTspiceIV of linear technology, but I can not rotate, is there a mistake?
I attach the files.
Greetings.

English please

dave

 

[QUINQUIN07]

Class D

Hello, thank you for your reply, but I copy the patterns to simulate on "LTspiceIV of linear technology, but I can not rotate, is there a mistake?
I attach the files.
Greetings.

View attachment 196227

 

[norazmi]

is there any DC at speaker output or is this problem solved ?

No DC, make the board carefully, its small board. Btw i solve my lc filter with ferrite toroid core with gapped. no noise no hot and big power, now i`m enjoy my stereo class D amp.

 

[Dacuycoy]

hi norazmi,

what type of toroid did you use?

regards,
Dac