900W H-class PA Amp with Limiter

[engel dela pena]

I suggest you to design your own PCB layout, and apply H-class step driver with TL072.

thank you,you have already shared to much information about class h

 

[engel dela pena]

anybody knows what specific model of crown use h step driver using tlo72
thread #107

 

[apexaudio]

anybody knows what specific model of crown use h step driver using tlo72
thread #107

S-C1100 pulse 2x1100W 4R, 2x1900W 2R, 2x750W 8R

 

[electra_ina]

good luck electra I am waiting for your first class H
regards gwendy

Thanks gwendy..it's just hobby and I haven't experiance with this project. Any way, I will tell you if I can't built this amplifier...I believe you have much experiance with Class H..
Sorry, kang.. my english "belepotan"..
Regards,
Electra_ina

 

[engel dela pena]

andrewlebon
how is your project going

 

[andrewlebon]

hi engel dela pena
greetings project almost over only waiting for nsl 32
have to align transistors to heat sink and thread holes
thanking you
andrew lebon

 

[qsa]

I don't know about a MOSFET output stage, but I tried with a quasi-comp bipolar stage and the oscillations were incredible. Every time the negative rail switched it broke into oscillation and went into overcurrent. The same exact circuit with complementary was rock stable. The quasi-comp circuit without the rail switches was also rock-stable. The combination of the two just didn't work.

do you have Class H schematic from not working quasicomplementary and working complementary design ? can you provide

 

[apexaudio]

do you have Class H schematic from not working quasicomplementary and working complementary design ? can you provide

I suggest you for H class amps to use only complementary BJT output.
Regards

 

[andrewlebon]

hi apex audio
grettings which is better irf 540 or irf 2807 have both

thanking you
andrew lebon

 

[apexaudio]

hi apex audio
grettings which is better irf 540 or irf 2807 have both

thanking you
andrew lebon

If U want use IRF2807 single fet is sufficient.

 

[qsa]

I suggest you for H class amps to use only complementary BJT output.
Regards

Thanks for Info, but can you explain me why not quasicomplentary Output Stage work with Class H ?

I want understand it..cant find any technical information why not Class H work with BJT or Mosfet or what the problem is

other thing is, Im lovin quasicomplentary Mosfet Output Stage Sound in PA, Im worry to hear Class H should be impossibile

 

[apexaudio]

Thanks for Info, but can you explain me why not quasicomplentary Output Stage work with Class H ?

I want understand it..cant find any technical information why not Class H work with BJT or Mosfet or what the problem is

other thing is, Im lovin quasicomplentary Mosfet Output Stage Sound in PA, Im worry to hear Class H should be impossibile

On negative side you have emiter on negativ rail which is more sensitive on PSU noise from step driver than colector. Sorry you can not use H-class on quasicomplentary output stage becouse of possible instability.

 

[kASD]

If anyone wants to

Try Class-H on Quasi-complementary mosfets then go for grounded bridge topology and use a monorail switch at high side, then only one unipolar switching will be needed.

 

[kASD]

On negative side you have emiter on negativ rail which is more sensitive on PSU noise from step driver than colector. Sorry you can not use H-class on quasicomplentary output stage becouse of possible instability.

QSC rmx/plx/pl/isa/mx series have emitters connected to step switch rather than collectors still they work nicely.

 

[andrewlebon]

hi workhorse
greetings can ab class amplifier be made into h class example
dx turbo by destroyer using apexaudio tlo72 rail switching supply

thanking you
andrew lebon

 

[kASD]

hi workhorse
greetings can ab class amplifier be made into h class example
dx turbo by destroyer using apexaudio tlo72 rail switching supply

thanking you
andrew lebon

Class-H is nothing except a class-ab amplifier with rail step switching.

The TL-072 switching has some serious flaws in driver turn-off, also the slew rate of that opamp configured as comparator is not adequate, instead use IR2117 circuit.

 

[engel dela pena]

Any IR2117 is OK
Any TO220 diode with 100V min and 8A min is OK
Transformer can be used, but you must use 10000uF 80V caps.
60V sec not conect.
Regards

D5LC20U I have this double diode i check it and found out 200v but only 5A
can i use this?

 

[andrewlebon]

hi apexaudio
greetings almost done

thanking you
andrew lebon

 

[apexaudio]

D5LC20U I have this double diode i check it and found out 200v but only 5A
can i use this?

It is 2x5A, 10A in parallel circuit.

 

[apexaudio]

hi apexaudio
greetings almost done

thanking you
andrew lebon

Look nice. Can U post picture of negative side and copper side PCB.