500W PA amplifier with Limiter

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#3,481
i fix problem my friends all my problems coming from ne5532. i buy 10 of them but i think they are fake or bad. only 1 channel work cause only 1 opamp was good. 🙁

so i change it with tl072 and all problems finish 😀

thank you for all helping for fix problems and thank you soo much to Mile for share this sweet amp.
 
#3,489

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#3,492
follow up

Shelah said:
I just gone went through the the whole thread and got quite a interested in making this amplifier. I have an 80-0-80vac 1600va transformer and I would like to make b500 TEF or b600 TEF stereo at 4ohms for PA use. what upgrades or changes can I make on the following?

>number of pairs of outputs per channel
>r24 and r25 in the case of b500
>bias circuit (r23 r24 and q5)
>any other upgrades if any.

Thanks and regards
Click to expand...



Sir mile, any advice please?
 
#3,494
Hi all . I wanted to use this amp with 5pairs transistors to power my 2ohm subwoofer :-

so my question is what Is the safe voltage to use
with a 2ohm load for extended periods of time??

what other modifications do I need to do to make it
robust at 2ohms operation??
 
#3,496
arksystem said:
Hi sir apex
I'm montajhe b500
Mje15032/3 replace tip41/2c
Tip 41/2c and c5200/a1943 hooootttt.
Way??!!!!!!!
Please help
Click to expand...

they need cooler did you do that? i have too much problems with this amp but all problems coming from bad or fake parts. and some from bad soldering. bold your lines from c5200 and a1943 check some pictures last pages.

amp is fine just need to focus on it when you making soldering cause its thin lines.
 
#3,497
karachay said:
they need cooler did you do that? i have too much problems with this amp but all problems coming from bad or fake parts. and some from bad soldering. bold your lines from c5200 and a1943 check some pictures last pages.

amp is fine just need to focus on it when you making soldering cause its thin lines.
Click to expand...
Hi sir
Tanks help
Ok amplifier b500
You instal nsl32 amp?!
I'm uninstall nsl 32.
-5db exit amp 2R distort.
60/0/60 dc voltajhe
2R =????watt
 
#3,499
stewin said:
Hi all . I wanted to use this amp with 5pairs transistors to power my 2ohm subwoofer :-

so my question is what Is the safe voltage to use
with a 2ohm load for extended periods of time??

what other modifications do I need to do to make it
robust at 2ohms operation??
Click to expand...

also just wondering :scratch1: is apex ax14 with multiple pairs better than apex 500watts pa , in terms of stability and durability?
 
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