UCD 25 watts to 1200 watts using 2 mosfets

[NMOS]

Is a full-bridge, have this power, right?

Hi

no not full bridge

this design is half bridge

wörking very stable, low component cost

 

[DC sound]

Hi DC Sound,
Do you have schematic of your irs900 look interesting to try to make my own one.

thanks
santosjoj

I don't have schem, I use the pcb lay-out of thien.chay....

 

[Jonsen]

My amp

Plz send smps diagrams


Sent from my SHV-E250L using Tapatalk

 

[kartino]

Guys,

Here I give you simple legend D900, but modded for better stabiliy.
It works and stable, robust already.

Layout credit to BieTronik

Regards,
kartino

 

[Vahrezyvalm]

Hi.Kartino.thanks for sharing.nice pcb design.by the way,do you have such design or others but with totem and more one pairs fets?

 

[stewin]

hi katrino .thanks for sharing .
have you tried to remove speaker/load when the amp is operating at +/-85vlts , or have you tried to power the amp without a speaker/load ??

 

[kartino]

Yes, I know some people have seen smoke when turning on D900 without speaker.

Well, the modification actually cannot remove that risk of smoking at all, but make it more safe. The two diodes after inductor will act as bypass. When the output voltage increased because open loop, the diodes keep output voltage never more than supply voltage by discharge the voltage to supply rails.

The bad news is that even the voltage is as low as your supply, it still can damage your zobel cap as it is not designed for such high frequency. So it is really depend on cap quality. The good news, except that cap, your amp will be fine.

 

[Roby Tengara Setiawa]

What's kind of Cap that we can use for zobel ? And R zobel, it' must carbon ?

Yes, I know some people have seen smoke when turning on D900 without speaker.

Well, the modification actually cannot remove that risk of smoking at all, but make it more safe. The two diodes after inductor will act as bypass. When the output voltage increased because open loop, the diodes keep output voltage never more than supply voltage by discharge the voltage to supply rails.

The bad news is that even the voltage is as low as your supply, it still can damage your zobel cap as it is not designed for such high frequency. So it is really depend on cap quality. The good news, except that cap, your amp will be fine.

 

[thole]

Guys,

Here I give you simple legend D900, but modded for better stabiliy.
It works and stable, robust already.

Layout credit to BieTronik

Regards,
kartino

Nice & great class D amp mod project....

 

[thole]

D900 Mod From Mr. Kartino

Result D900 mod by mr. Kartino
Thanx for nice D900 mod
(Pic from Class D group FB)

regards

 

[Parag99]

170-0-170vdc

 

[Parag99]

nice work para, what is the operating voltage and output fets??

170-0-170 vdc

 

[stewin]

any photos sir ??

 

[stewin]

hi all i have used this schematic with success at +/-85vlts at 2ohms irfb4227 with success i wanted to use high voltage +/-120vlts with irfb4229 with a 4 ohm load is it possible????

 

[Pafi]

Full bridge, +/-85vlts at 2ohms irfb4227? Oh. My. God. You must be veeeerrrry lucky.

 

[ionutzxpo]

IRFB4227 will maybe only on music program whitstand 2 ohm load at 85V not even think how you manage to not blow them at 1 ohm load on each half bridge (full bridge 2 ohm total load seen by the amp)

 

[stewin]

Full bridge, +/-85vlts at 2ohms irfb4227? Oh. My. God. You must be veeeerrrry lucky.

not fullbridge sir but halfbridge at 2ohms +/-85vlts .


i wanted to use +/-120vlts half bridge at 4 ohms using irfb 4229, is it possible???

 

[Pafi]

The schematic posted by you is full bridge.

i wanted to use +/-120vlts half bridge at 4 ohms using irfb 4229, is it possible???

In half bridge it's not perfectly impossible, but absolutely not safe. See recommendation in datasheet: 300-500 W. Maybe little more, but not 1500 W.

IRFB4227 is basically more efficient.

 

[stewin]

thanks sir for reply . then what fets can i use for ucd half bridge +/-120 volts at 2 ohms and they work safely ??
or can i use fullbridge ucd at 4ohms +/-75volts with irfs4227 .

 

[Pafi]

youre welcome!

or can i use fullbridge ucd at 4ohms +/-75volts with irfb4227

This is better for more reasons.