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Old 28th March 2012, 04:20 AM   #1981
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GERIBESLIMI is Output
16V is the rating of 100uf Capacitor
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Old 2nd April 2012, 04:55 AM   #1982
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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=0B7B...TE5vejdLTEY2QQ
https://docs.google.com/viewer?pid=e...umber=1&w=2000
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Last edited by DAMANHURI; 2nd April 2012 at 05:07 AM.
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Old 3rd April 2012, 09:16 AM   #1983
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Quote:
Originally Posted by DAMANHURI View Post
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=0B7B...TE5vejdLTEY2QQ
https://docs.google.com/viewer?pid=e...umber=1&w=2000
Nice work but I have not time for check. Use +/-95 vdc maximum.
Regards
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Old 3rd April 2012, 04:02 PM   #1984
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Quote:
Originally Posted by DAMANHURI View Post
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=0B7B...TE5vejdLTEY2QQ
https://docs.google.com/viewer?pid=explorer&srcid=0B7BjJtgHFAFLRmNEWk1ieUZ TY2lDTE5vejdLTEY2QQ&docid=5f29a13ce819b68a4a6d0d00 09418d3d|b458afcd9923687818c197b54ccca899&a=bi&pag enumber=1&w=2000
very nice sir .. good job . good luck thank u
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Old 4th April 2012, 03:28 AM   #1985
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Thanks APEX and Aman.
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Old 4th April 2012, 02:46 PM   #1986
comasus is offline comasus  India
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Originally Posted by apexaudio View Post
Try compensate with 47pF base to colector on VAS tranzistors MJE340/350
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??
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Old 4th April 2012, 04:18 PM   #1987
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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??
I have problem with fake MJE340/350, you can replace them with 2SA1837/2SC4793 or similar for test
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Old 5th April 2012, 07:53 AM   #1988
comasus is offline comasus  India
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Originally Posted by apexaudio View Post
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

500W PA amplifier with Limiter
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Old 5th April 2012, 08:30 AM   #1989
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Originally Posted by comasus View Post
Hi Mile

i have only used 2sa1837/2sc4793 instead of mje340/350

you can see my pictures

500W PA amplifier with Limiter
Replace NE5532 with TL072
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Old 13th April 2012, 01:36 AM   #1990
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Good gesign. Damanhuri.
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