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Old 2nd May 2012, 07:56 PM   #2001
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Quote:
Originally Posted by comasus View Post
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
Use preamp with tone control like Mic, Line, EQ... Preamps
Regards
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Old 8th May 2012, 11:53 AM   #2002
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hi apex sir,
my b500 is working perfect without chassis, but i put hole gadgets inside the chassis and now big hum is coming through speakers, what is the reason for this?
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Old 11th May 2012, 09:04 AM   #2003
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Originally Posted by nazirdigi View Post
hi apex sir,
my b500 is working perfect without chassis, but i put hole gadgets inside the chassis and now big hum is coming through speakers, what is the reason for this?
Did you connect GND to chassis and in what point?
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Old 11th May 2012, 11:26 AM   #2004
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Originally Posted by apexaudio View Post
Did you connect GND to chassis and in what point?
i connect GND to near the power transformer.
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Old 14th May 2012, 05:37 AM   #2005
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B500 TRIPLE DARLINTON,
neet to put 10k pot and 47r base to emmitter to drivers.

pcb size 70mm by 230mm.
Attached Images
File Type: jpg b500- tef.jpg (339.8 KB, 943 views)

Last edited by wattaniya; 14th May 2012 at 05:40 AM.
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Old 14th May 2012, 12:00 PM   #2006
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Originally Posted by nazirdigi View Post
i connect GND to near the power transformer.
Connect GND near to the input terminals (post #54)
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Old 14th May 2012, 07:46 PM   #2007
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Quote:
Originally Posted by apexaudio View Post
For BIAS setup R22 should be 1k2 instead 680R for triple darlington output stage, and R23 is correct 330 ohms.
Q5 (MJE340) must be on main heatsink with outputs.
Predrivers MJE340/350 can use smal heatsinks, but no need.
Regards
hi apex sir,
is this r22, r23 value correct for triple darlington.

in h900 thread u said post no 2060 image value is correct, both values are different values, pls verify this.

only I'm 100percent success with Ur amps,

Last edited by wattaniya; 14th May 2012 at 07:51 PM.
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Old 14th May 2012, 11:52 PM   #2008
nix is offline nix  Philippines
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Quote:
Originally Posted by nazirdigi View Post
B500 TRIPLE DARLINTON,
neet to put 10k pot and 47r base to emmitter to drivers.

pcb size 70mm by 230mm.
hi nazirdigi
do you have pcb copper side of this layout?

regards
nix
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Old 15th May 2012, 06:06 AM   #2009
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Location: Lahore, Pakistan
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Originally Posted by Tony View Post
yes, you have a gain of x45, a 1volt input should drive your amp to almost clipping.
Sir,

I think pre amps can solve your problem effectively...
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Old 15th May 2012, 06:08 AM   #2010
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Quote:
Originally Posted by comasus View Post
Hi! Mile
I tried compensating with 47pF caps but didn't worked still the zobel resistor is getting warm

if amplifier is used continuously that is oscillating then are there any possibilities of weakening of output transistors that leads to poor sound quality and power??
Sir,

If u r using the thinner wire in zubel then it will also occur.
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