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Old 7th December 2011, 08:01 AM   #1841
AJT is offline AJT  Philippines
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gains for hifi amps are about x20, while professional/PA amps start at x40, i even saw a design with gains of x70....
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Old 7th December 2011, 08:54 AM   #1842
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hi apex sir,
can i use c5171,a1930 or c4793,a1837 instead mje340,mje350 for pre driver section.
if its ok so is it need small heatsink or no need heatsink.
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Old 7th December 2011, 12:16 PM   #1843
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Originally Posted by nazirdigi View Post
hi apex sir,
can i use c5171,a1930 or c4793,a1837 instead mje340,mje350 for pre driver section.
if its ok so is it need small heatsink or no need heatsink.
Yes, and use very small heatsink.
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Old 7th December 2011, 12:36 PM   #1844
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Yes, and use very small heatsink.
thanks sir for the reply.
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Old 7th December 2011, 03:35 PM   #1845
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Replace R2, use 1k instead 10k and gain will increase.
If R22(680) decreased bias decreases or not?

Can I use 3mm led in place of NSL32?
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Old 7th December 2011, 07:47 PM   #1846
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If R22(680) decreased bias decreases or not?

Can I use 3mm led in place of NSL32?
Yes and yes, you have 'clip' led and amp without limiter.
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Old 8th December 2011, 01:32 AM   #1847
comasus is offline comasus  India
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Yes and yes, you have 'clip' led and amp without limiter.
Thank you sir for your reply
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Old 8th December 2011, 01:12 PM   #1848
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@ JOHN BALI:

Very nice design! I also wanted to build my B500 with TTA and TTC transistors, but they are unavaiable here
I like to get my hands on those trannies, their advantage is that their case is full plastic (even their heatsink side)
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Old 16th December 2011, 01:42 PM   #1849
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@ JOHN BALI:

Very nice design! I also wanted to build my B500 with TTA and TTC transistors, but they are unavaiable here
I like to get my hands on those trannies, their advantage is that their case is full plastic (even their heatsink side)
But finally I made it with 2SA & 2SC
I keep those TTA & TTC because maybe it not as good 2SA & 2SC
note that TTA & TTC is new product, maybe replacement for 2SA & 2SC
the back of those TTA & TTC are metals, not full plastic case
that make a little doubt, maybe it fake or not that good older version

I'm also happy if I can find full plastic case, so we can mount it easier

Btw thanks, my PCB is not good there are miss-route on it
on it IC's pin 1 & 3, sorry not fix that yet

Regards
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Old 17th December 2011, 11:18 PM   #1850
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Hello mile can i ask if it is possible to use 85vdc+/- on B500 do i have to change anything any modification?
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