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Old 18th December 2010, 02:15 PM   #1031
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PCB for PA Stereo Protect, but I not suggest use this protect with B500 and H900. This protect use for 50-250W amps.
Regards
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Old 18th December 2010, 02:37 PM   #1032
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hello sir

today i test my h900..it work,s ...

but it clips when output is 35v..i use 110-55-0-55-110V DC...

how can i know HV is working......???

thank u sir
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Old 18th December 2010, 02:51 PM   #1033
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Quote:
Originally Posted by aman khalsa View Post
hello sir

today i test my h900..it work,s ...

but it clips when output is 35v..i use 110-55-0-55-110V DC...

how can i know HV is working......???

thank u sir
35V AC, DC, RMS, peak...
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Old 18th December 2010, 03:30 PM   #1034
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amp clips when output voltages is 35 AC .. . peak output is 50V AC Without limter....

Last edited by aman khalsa; 18th December 2010 at 03:40 PM.
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Old 18th December 2010, 03:59 PM   #1035
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Originally Posted by aman khalsa View Post
amp clips when output voltages is 35 AC .. . peak output is 50V AC Without limter....
Do you see clip on the scope? Describe your measurement...
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Old 18th December 2010, 04:01 PM   #1036
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i have no scope sir i have only DMM....
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Old 18th December 2010, 04:35 PM   #1037
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Originally Posted by apexaudio View Post
Use this circuit for stereo, only add DC protect for channel 2. If you have two heatsinks add BD241C(TIP31C) in parallel.
Regards
Hello APEX

have add in your PA PROTECT design

1. LED WARNING ! HEATSINK TEMP 75deg !

and

2. 35deg FAN ON / OFF (dont like noisy FAN if using amp with low output power or HI-FI)

could this work ?
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File Type: pdf N VMOS MK2 FAN CONTROL 18.12,2010.pdf (17.2 KB, 504 views)
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Old 18th December 2010, 04:45 PM   #1038
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Quote:
Originally Posted by apexaudio View Post
PCB for PA Stereo Protect, but I not suggest use this protect with B500 and H900. This protect use for 50-250W amps.
Regards

can you share with us protect schematic for H900 and B500
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Old 18th December 2010, 06:00 PM   #1039
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Quote:
Originally Posted by aman khalsa View Post
i have no scope sir i have only DMM....
Multi meter can read only DC or 50Hz RMS AC voltage. If you use LED instead NSL32, and run amp with 0,+/-55v,+/-110v rail voltage, LED will light on if you have 95v peak voltage on amp out with high level audio input. With low rail voltage of +/-55v, amp will clip at about 50v output voltage, and LED can't light on if step driver not work and not increase rail to +/-110v at peaks.
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Old 18th December 2010, 06:05 PM   #1040
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Quote:
Originally Posted by NMOS View Post
Hello APEX

have add in your PA PROTECT design

1. LED WARNING ! HEATSINK TEMP 75deg !

and

2. 35deg FAN ON / OFF (dont like noisy FAN if using amp with low output power or HI-FI)

could this work ?
Your circuit for 35deg fan on/off is wrong. Use PNP transistors to switch fan (+) to GND. PA protect is for B500 and H900, I just suggest not use stereo PA protect for this powerfull amps.
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