500 watts Class g power amp

[coolet]

these is my 1 cent... Junction "A" control the base current of the output trannies with respect from the output of op-amp and "B" controls the +/-HV.

 

[coolet]

LM317's are configured as precision current limiter... nice

 

[C3PO]

500 w amp

these is my 1 cent... Junction "A" control the base current of the output trannies with respect from the output of op-amp and "B" controls the +/-HV.

yes the output stage is common emitter, similar to old QSC amps that uses an op amp to drive the output stage, no VAS stage

 

[C3PO]

500 w amp

LM317's are configured as precision current limiter... nice

you are right, i think lm317 has internal protection which limits the driver transistors when the output transistors demands more current drive, just my idea

 

[C3PO]

500 w amp

hmmm... maybe point A in the schematic is the NFB point that connects to speaker output, see all those feedback components from the op amp inverting input, in the schematic point A is connected to psu ground, it might be incorrectly drawn, just my idea, i could be wrong

 

[masood]

dear sir please send me its pcb layout

 

[kanon]

I think this is a work of luci dog.
Put the link on where you copy.
for more information



creo que eso es un trabajo de luci perro .
pon el link de donde lo copy.
para mas informacion

regards

 

[masood]

dear kanon,
my email is khan.shahid251@gmail.com
thanking you yours masood ahmad

 

[siliconray]

LM317 can be subsitutited with any other regulators such as LM7805 in cases of low current

 

[kenpeter]

Looks to me like gate drives might be wrongly phased.
High rails enabled only when output doesn't need them.
Maybe I misunderstand how that logic is being driven?

 

[kenpeter]

in the schematic the NFB was mistakenly connected to SGND. see attach schematic.

I think the connection you cut was an intentional bootstrap for the op-amps.

 

[irvynejay]

here are the complete file with pcb of the output and driver

Get 500-watt-bjt-anfi-devresi-mjl1302-mjl3281.rar on Wupload.com

 

[Michotech]

Hello forum people, am new here, though not new in building amplifiers and other circuits, pls i will appreciate if you could help me with 1000watts amp circuit diagrams.

 

[jgeissin]

Has this amp been built and tested? It looks like a nice design.
A 15A transformer in the power supply is going to weigh a TON!
Love to build one of these.

 

[mathez]

how abbout the D2012?

 

[forcetech]

hi
may u pls send me circute for this amp

 

[forcetech]

hi
may you pls post the circute

 

[netuddki]

Hi!

pcb for 500 watt!!

 

[pankaj kashyap]

sir your design looking good but, is it successful amp in professionl use?

 

[MAXTRONIX]

500 w amp



yes thats it. maybe the feedback resistor is missing in the schematic, there has to be NFB on this circuit somehow, thanks coolet

Hello i repaired GLS 1800 amp having this kind of circuit i tried to look for NFD but to no avail