900W H-class PA Amp with Limiter

[stewin]

for reference ........................., QSC RMX 5050

wow +/-165volts

 

[rohin]

apex h900 v2

some progress.one channel work in ab class on +-55 because he is waiting for ir 2117.sound quality is best as i know because it has label APEX on it.

 

[rohin]

photos

thanks to sir mile for sharing wonderful project.happy diwali.

 

[apexaudio]

some progress.one channel work in ab class on +-55 because he is waiting for ir 2117.sound quality is best as i know because it has label APEX on it.

Nice work,
Regards

 

[rohin]

ir 2117

wait is over.fun start.

 

[Parag99]

Sir mill
Which is tha negative feedback resistor
On which resistors gain of H900 will set

 

[Shelah]

Use this circuit for stereo, only add DC protect for channel 2. If you have two heatsinks add BD241C(TIP31C) in parallel.
Regards

sir mile can you show by way of drawing how the short circuit protection for channel 2 is intergrated to this schematic.
regards

 

[rohin]

hi, today i check my h900 output voltage.excellent result.input 50hz sine wave output more than 70v.my clip led glown at 62v.thanks to sir mile.i want to tell more about sir mile ,everybody also know it already.his response is quick than anyone and more friendly attitude.

 

[rohin]

To apex sir

one difficult question how to check short circuit protection fuction through amplifier? before make my amp my question about limiter is limiter should work on 65v.now i made it check it , starts at 62 v.i want same that.in earlier post you tell us that it will clip before 15v of hv rail.if hv is 110 then it clip on 95v.is this other format vpf or rms or acv?.sir please explain i want to know.

 

[wattaniya]

apex sir .
question asked by rohin.
earlier post you tell us that it will clip before 15v of hv rail.if hv is 110 then it clip on 95v.is this other format vpf or rms or acv?.sir please explain i want to know.

 

[apexaudio]

apex sir .
question asked by rohin.
earlier post you tell us that it will clip before 15v of hv rail.if hv is 110 then it clip on 95v.is this other format vpf or rms or acv?.sir please explain i want to know.

62v RMS is about +/-88V peak.

 

[wattaniya]

can u tell ,how to calculate the rms to peak.

 

[rohin]

hi ,thanks apex sir i knew that you cann't be wrong.there is some misunderstanding.anyhow i made my h 900 v2 without any probelm even amp start at my first attempt.i want to thanks to apex sir,aman khalsa,sandeep,wattaniya.perhaps i did a mistake that i make my toroidal near 2200 va.this is too much for h900 stereo because i check with my meters amp never take even 4ampere at good load.thanks again.

 

[AndrewT]

can u tell ,how to calculate the rms to peak.

Use sqrt(2)

for a sinewave the Peak Voltage = sqrt(2) * Vrms

 

[Shelah]

hello sir Mile is there a way to connect the circled area to two seperate channels since the original design is for one channel? and if possible edit the schematic to show stereo connection.

 

[apexaudio]

hello sir Mile is there a way to connect the circled area to two seperate channels since the original design is for one channel? and if possible edit the schematic to show stereo connection.

Connect PRO from two channels in parallel

 

[rohin]

when i was making h900 amp then i made many test points for stepper is working or not.i didn't install ic ir 2117 and one important things i noted that on open mosfet gate it behave like a on switch.hv going through mosfet direct to amp.

 

[congressman]

Do not connect the mosfet yet. Measure the voltage at the pcb point where the gate is connected. Slowly adjust the volume until you get a voltage reading. Compare it to the datasheet of mosfet on the point that when it will start to conduct.

 

[rohin]

Do not connect the mosfet yet. Measure the voltage at the pcb point where the gate is connected. Slowly adjust the volume until you get a voltage reading. Compare it to the datasheet of mosfet on the point that when it will start to conduct.

hi dear sir, you cann't get my point.when gate is open that time this happen.it mean all mosfet will do the same behave.after installing ic its ok.once again when mosfet gates in open position its behave like on switch.this will happen all the time when mosfet working in same circuit like this amp.

 

[Shelah]

hello sir mile,
greetings. when you say in parallel is it like this?