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Old 13th April 2012, 04:16 AM   #1991
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Originally Posted by MATSAZILIN View Post
Good gesign. Damanhuri.
Thanks Sir Matsazilin
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Old 13th April 2012, 07:06 AM   #1992
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Very nice P.c.b. Damanhuri.
could you send pdf files to me vedmitraa@gmail.com
warm regards
Vedmitra Sharma
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Old 13th April 2012, 11:34 AM   #1993
khalsa is online now khalsa  India
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very nice pcb Damanhuri
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Old 16th April 2012, 04:01 AM   #1994
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Thanks Broe Khalsa.
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Old 16th April 2012, 10:34 PM   #1995
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Originally Posted by apexaudio View Post
B500 based on schematics of H900, but in AB class.
Power supply +/-90Vmax.


hello, first of all I take this opportunity to greet him from Argentina, and I would inquire about the function of the component that is marked as ldr, of course, thanks and sorry for the inconvenience
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Old 24th April 2012, 07:43 PM   #1996
taj1989 is offline taj1989  Hungary
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Hi! I've built this amplifier with 5 pairs of transistors, without protection and limiter:
Click the image to open in full size.
I tested it today from a +-30V regulated power supply. On the outpur I measured -30V, but the transistors aren't dead, fortunately I limited the current to 200mA on the supply. Can somebody help me what should I check on the circuit? Can this hapen because there isn't enough voltage on the opamp?
Thank you for your help!
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Old 24th April 2012, 09:10 PM   #1997
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For test with +/-30V rail voltage replace 4k7/2W with 1k/2W, and connect input gnd to psu gnd.

Last edited by apexaudio; 24th April 2012 at 09:18 PM.
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Old 26th April 2012, 08:19 PM   #1998
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Quote:
Originally Posted by apexaudio View Post
B500 based on schematics of H900, but in AB class.
Power supply +/-90Vmax.
hello people, I wanted to consult those who have assembled this amplifier function of the component that is marked with "LDR" from already thank you very much and greetings to all.
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Old 27th April 2012, 08:32 AM   #1999
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Originally Posted by luisitoloco22 View Post
hello people, I wanted to consult those who have assembled this amplifier function of the component that is marked with "LDR" from already thank you very much and greetings to all.
Hi luisitoloco22,
that "LDR" use for limiter actually it is part of NSL32(LDR + LED), not used if you don't want to use limiter. You can use 1 resistor + 1 LED instead
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Old 2nd May 2012, 01:23 PM   #2000
comasus is offline comasus  India
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Default @Mile

Hi! Mile

The HF instability problem was solved i dont know how it was happen

but need to increase treble response its not even like ax-14

please help me mile

Regards
Joel
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