Class D Amp with LM566, LM393 and 2XIRF530

[Dacz]

i redraw the schematic of mr apex d200 and rename the parts.. sir apex can you take a look if i miss something

 

[apexaudio]

i redraw the schematic of mr apex d200 and rename the parts.. sir apex can you take a look if i miss something

Nice work, but some values is wrong 1k5/1W and 30uH...
Regards

 

[de Ocampo]

Dacz,

 

[gerry_morales]

sis abetir what software dacs use for schematic rendering

 

[de Ocampo]

^I guess something like Altium or Proteus...but let us ask Dacz, I sure do know that he uses a professional CAD software 🙂

 

[Dacz]

Nice work, but some values is wrong 1k5/1W and 30uH...
Regards

thanks apex.. here's the corrected one.

 

[dimakos]

hi Dacz.C2 is 1nf no 100nf think so

 

[Dacz]

thanks dimakos

sir apex, what is the ideal gate resistor value for IRFB4227?

 

[manojtm]

Hi Dacz,

Remove R13&R12 and R11 is 1K/2W C25 is 100pF/100V R21&R20 is 6K8/2W R14 change to 60K (Parallel 100K & 150K) and Remove C2, R2 is 1K2 remove R23 & Provide Zener 15V parallel C13 & L1 is 22uH, 0.22uF/400V use C27 Parallel & .Now the audio will good & use 330R/2W series with Q4 Collector { Now you can use IRFP250N}.

Regards
MANOJ

 

[QQ12e5k1]

D200.2

Here my Apex D200.2, working very good and hifi sound. Tested with 30vac and fets are cold, just Tip31 going warm.

Regards

 

[apexaudio]

Here my Apex D200.2, working very good and hifi sound. Tested with 30vac and fets are cold, just Tip31 going warm.

Regards

Nice work, TIP31 must have heatsink.
Regards

 

[stewin]

hi has anyone ever tried to bridge this amp ? ?

 

[DC sound]

Hi Apex,

I've test my D200 this morning... I play it in 30minute the inductor is hot i used sendust core as will the 10ohms in zobel is hot.. sound very good very clear... I plan to change the inductor with T106-6, but I notice the out put power is low i think is about 40-50watt.. it is ok to change the feedback resistor into 100k to achive higher gain just like other d-amps?

 

[apexaudio]

Hi Apex,

I've test my D200 this morning... I play it in 30minute the inductor is hot i used sendust core as will the 10ohms in zobel is hot.. sound very good very clear... I plan to change the inductor with T106-6, but I notice the out put power is low i think is about 40-50watt.. it is ok to change the feedback resistor into 100k to achive higher gain just like other d-amps?

No, just replace inductor.

 

[DC sound]

No, just replace inductor.

ok...thanks Apex...

 

[Dacz]

sir apex, is the schematic correct if i use external +/-5v and -21v power supply

 

[apexaudio]

sir apex, is the schematic correct if i use external +/-5v and -21v power supply

+12V is ref to -75V not to gnd.

 

[Dacz]

got it.. it must be isolated from the gnd

 

[apexaudio]

got it.. it must be isolated from the gnd

Yes, that is corect.

 

[de Ocampo]

Has anyone made a comparable measurements between using gapped EE flyback traffo & iron powders as output inductors? I made some listening test and it seems, the gapped EE ferrite performs really good as well. It is definitely cold probably colder than the T106-2. I experimented another EE same size as flyback traffo but ungapped, I did however made a 1mm gap on one leg and it surprisingly performs very good as well.