900W H-class PA Amp with Limiter

Bottom Side

Excuse me Sir,is this amp work good??
Do you have the bottom side and schematic??

Regards
 

Attachments

  • APEX Hclass PowerMON.jpg
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NSL32 is opto-ldr, ldr with integrited led diode. There is four pins + and - (litle circle is -) from led diode and two pins from resistor. When led light resistor value incrise and atenuate input signal, that how limiter work. On your picture is just ldr with two pins, U can use this ldr as limiter with clear red led diode put together in black pipe.

is this the same use in shredder machine and copiers. .one is led and the other one is phototransistor and it is activated by a lever between it which blocks the led light thus preventing the photo transistor from conducting.
 
No, it's not same optoresistor change resistance from 500000ohm to 50ohm, optotransistor just conducting.



sir is it possible for your dc protect to make it stereo and also your short circuit protect so that there will be not too much pcb.should i parallel resistor on 150k and how about the short circuit.what should i add to make it stereo.and should cut the line in middle between those pins of the relay to make it stereo is that possible?
 
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sir is it possible for your dc protect to make it stereo and also your short circuit protect so that there will be not too much pcb.should i parallel resistor on 150k and how about the short circuit.what should i add to make it stereo.and should cut the line in middle between those pins of the relay to make it stereo is that possible?
 

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  • APEX PA Protect Stereo.jpg
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  • APEX PA Protect Stereo layout.jpg
    APEX PA Protect Stereo layout.jpg
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Hello sir. Thank you for sharing knowledge is very valuable. I would like to learn more about class H three steps. About VERTEX noticed a resistance value of R100 is different. I did not understand the "COUTI"nor the lm082. HER156 has similar?. I want to build the PCB of VERTEX. Will this work? Thanks!
 
zener diode heating

hi apex audio
greetings yesterday i tested second channel of h900 sound is clear
no distortion but the 15 VOLT ZENER DIODE GOING TO NSL32 IS VERY HOT this problem i did not encounter in any of my h900 i have made before any reason
why this is happening base voltages supply voltages are correct load was 8 ohms output transistors are not very hot normal temprature
thanking you
andrew lebon