Hi
no not full bridge
this design is half bridge
wörking very stable, low component cost
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
Here I give you simple legend D900, but modded for better stabiliy.
It works and stable, robust already.
Layout credit to BieTronik 🙂
Regards,
kartino
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?
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 ??
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 ??
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.
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.
D900 Mod From Mr. Kartino
Result D900 mod by mr. Kartino
Thanx for nice D900 mod
(Pic from Class D group FB)
regards
Result D900 mod by mr. Kartino
Thanx for nice D900 mod
(Pic from Class D group FB)
regards
Attachments
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) 🙂
not fullbridge sir but halfbridge at 2ohms +/-85vlts .
i wanted to use +/-120vlts half bridge at 4 ohms using irfb 4229, is it possible???
The schematic posted by you is full bridge.
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.
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.
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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 .
or can i use fullbridge ucd at 4ohms +/-75volts with irfs4227 .