Apex, I build from the B500 with the addition of a few transistors Final, please check whether the correct or there is an error. how many volts to power it work well? sorry my bad english.
regards. Damanhuri
https://docs.google.com/open?id=0B7BjJtgHFAFLRmNEWk1ieUZTY2lDTE5vejdLTEY2QQ
https://docs.google.com/viewer?pid=...687818c197b54ccca899&a=bi&pagenumber=1&w=2000
regards. Damanhuri
https://docs.google.com/open?id=0B7BjJtgHFAFLRmNEWk1ieUZTY2lDTE5vejdLTEY2QQ
https://docs.google.com/viewer?pid=...687818c197b54ccca899&a=bi&pagenumber=1&w=2000
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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??
I have problem with fake MJE340/350, you can replace them with 2SA1837/2SC4793 or similar for test
Hi Mile
i have only used 2sa1837/2sc4793 instead of mje340/350
you can see my pictures
http://www.diyaudio.com/forums/solid-state/164208-500w-pa-amplifier-limiter-184.html#post2809144
Very nice P.c.b. Damanhuri.
could you send pdf files to me vedmitraa@gmail.com
warm regards
Vedmitra Sharma
could you send pdf files to me vedmitraa@gmail.com
warm regards
Vedmitra Sharma
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
Hi! I've built this amplifier with 5 pairs of transistors, without protection and limiter:
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!
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!
For test with +/-30V rail voltage replace 4k7/2W with 1k/2W, and connect input gnd to psu gnd.
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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