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Old 28th November 2010, 08:50 AM   #951
sekhar is offline sekhar  India
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the driver board is yet to come ....................



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Old 28th November 2010, 08:56 AM   #952
sekhar is offline sekhar  India
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Quote:
Originally Posted by mihailo View Post
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:



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sekhar
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Old 28th November 2010, 09:39 AM   #953
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sekhar,
good job
will wait for driver board
by the way what is your supply now,using this additional trannies
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Old 28th November 2010, 10:54 AM   #954
mihailo is offline mihailo  Serbia
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My apologize Sekhar, I didn't meant to insult you.
Ok. I will try to print it myself today and post PCB size. :-)
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Old 28th November 2010, 11:04 AM   #955
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Quote:
Originally Posted by irvynejay View Post
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.
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Old 28th November 2010, 11:11 AM   #956
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Quote:
Originally Posted by apexaudio View Post
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?
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Old 28th November 2010, 11:19 AM   #957
AndrewT is offline AndrewT  Scotland
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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?
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Old 28th November 2010, 12:56 PM   #958
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hello everyone pls help me for XLR input with stereo bridge switch
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Old 28th November 2010, 01:04 PM   #959
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Default use this pcb lay out if u want to add more pairs into b500..

i use this pcb layout it works for me...
Attached Images
File Type: png B500 Drive_.PNG (109.3 KB, 971 views)
File Type: png B500 Easy Main Driver Top.PNG (160.4 KB, 932 views)
Attached Files
File Type: pdf out put.pdf (14.0 KB, 359 views)
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Old 28th November 2010, 01:16 PM   #960
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by A square View Post
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.
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