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Old 30th May 2010, 02:00 PM   #131
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Quote:
Originally Posted by engel dela pena View Post
apex,
do you have this arcam clone design
regards
NO, IRFP9240 is inexpensive
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Old 10th June 2010, 07:10 AM   #132
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apex,
can i use darlington output with ultimate fidelity?
using ML3 and this amp,a powerful guitar amp
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Old 10th June 2010, 06:29 PM   #133
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Quote:
Originally Posted by engel dela pena View Post
apex,
can i use darlington output with ultimate fidelity?
using ML3 and this amp,a powerful guitar amp
Yes, circuit in post #4, thread:
Amplifier motherboard
Regards

Last edited by apexaudio; 10th June 2010 at 06:58 PM.
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Old 12th June 2010, 02:25 PM   #134
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I must say DIY amplifiers are different than comercial amps. Look at the schematics of Pioneer A80 from 80', and you can't find anything better in modern amplifier schematics, and DIY amplifier is not made to competition with comercial in that way, but if you use quality case, heatsinks, speakers terminals, strong transformer and more caps, outputs... than brands, you can get valuable stuff.
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Old 13th June 2010, 10:49 AM   #135
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Default 100w hi-fi

I must share this 100W/4R amplifier.
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File Type: jpg APEX 100W HI-FI.jpg (304.7 KB, 3926 views)
File Type: jpg 100W HI-FI.JPG (744.5 KB, 3523 views)
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Old 13th June 2010, 11:49 AM   #136
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apex,
bottom side pcb
regArds
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Old 13th June 2010, 12:46 PM   #137
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Quote:
Originally Posted by engel dela pena View Post
apex,
bottom side pcb
regArds
I lost this file, do you realy need this pcb?
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Old 13th June 2010, 12:56 PM   #138
balaboo is offline balaboo  United States
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Um, Mile, I believe the 220R emitter resistor in the VAS current source should be 100R - I have a similar amplifier that sees use as a guitar amplifier.
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Old 13th June 2010, 01:20 PM   #139
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Quote:
Originally Posted by apexaudio View Post
I lost this file, do you realy need this pcb?
apex,
i follow all your model
specialy darlington output
regards
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Old 13th June 2010, 01:31 PM   #140
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Originally Posted by balaboo View Post
Um, Mile, I believe the 220R emitter resistor in the VAS current source should be 100R - I have a similar amplifier that sees use as a guitar amplifier.
With 100R emitter resistor disipation on VAS transistor will be about 300mW, that's OK for 2N5401/2N5551, but I use 220R like in Carvin PB200.
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