500W PA amplifier with Limiter

[sekhar]

the driver board is yet to come ....................



regards
sekhar

[sekhar]

Originally Posted by mihailo

Hi, Sekran.
Can you post PCB dimensions? Will it work in 2ohm with 6 pair of transistors?
Regards

i myself dont know the pcb dimention because i just edited the b500 pcb as a picture file so asked some one to print it and post the size . neways with 6 o/p pairs u feel safer with 4E load not 2E. Miles will educate us on this topic more as he much more experienced ...... and mihailo my name is " SEKHAR" not sekran:



regards
sekhar

[engel dela pena]

sekhar,
good job
will wait for driver board
by the way what is your supply now,using this additional trannies

[mihailo]

My apologize Sekhar, I didn't meant to insult you.
Ok. I will try to print it myself today and post PCB size. :-)
Regards

[apexaudio]

Originally Posted by irvynejay

Mile I've done connecting the Step drive to my B500 single channel and i felt/hear the difference so very load even i only use +/-75 +/-42 load 4 ohms 500 watts speaker..

and i just want to know how to determine if tl072 is really working ,i dont have scope i just have multi meter.

Multi meter can read only DC or 50Hz RMS AC voltage. If you use LED instead NSL32, and run amp with 0,+/-42v,+/-75v rail voltage, LED will light on if you have 60v peak voltage on amp out with high level audio input. With low rail voltage of +/-42v, amp will clip at about 38v output voltage, and LED can't light on if step driver not work and not increase rail to +/-75v at peaks.

[irvynejay]

Originally Posted by apexaudio

Multi meter can read only DC or 50Hz RMS AC voltage. If you use LED instead NSL32, and run amp with 0,+/-42v,+/-75v rail voltage, LED will light on if you have 60v peak voltage on amp out with high level audio input. With low rail voltage of +/-42v, amp will clip at about 38v output voltage, and LED can't light on if step driver not work and not increase rail to +/-75v at peaks.

ok i will try again with clip led ..is it normal step drive circuit not heating up even on full volume?

[AndrewT]

if the clip LED illuminates on a very fast transient, can it be seen?
How long does the transient have to last for our eyes to see the light?

Do we need a timer to hold the LED on for maybe 1ms?

[A square]

hello everyone pls help me for XLR input with stereo bridge switch

[aman khalsa]

i use this pcb layout it works for me...

[AndrewT]

Originally Posted by A square

hello everyone pls help me for XLR input with stereo bridge switch

Hi,
if you have a balanced source fed in through an XLR plugged cable then you don't need a bridged switch. Each half of the amplifier will be driven by the hot or cold input pins.

Read Rane, Jensen, D.Self, ESP.