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Old 30th January 2006, 03:03 PM   #1
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Default check this out..higher the voltage of this amp

i have this design and my power supply is higher than the supply of this design..so i will be going to change output transistors into 2SC5200 and 2SA1943, and add more to make 4pnp and 4npn..
i need your comment guyss

thanks a lot..

Ryan Jan
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Old 30th January 2006, 03:24 PM   #2
MOER is offline MOER  United States
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Default amplifier design

Not a very good design.

The differential pairs are simply driven by resistors from the rails. Poor CMRR and if you change the power supply voltage then the currents up the differential pairs will change which will then change the current up the VAS which will then change your idling current which if it is too high will blow up your amplifier.

The trimmer in the bias circuit is dangerous. If the trimmer wiper lifts, you output stage will blow instantly since all bias control will be lost.

There are many good designs on the web. This circuit which you have posted is a classic full complementary design which has been done for over thirty years now.
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Old 30th January 2006, 03:27 PM   #3
MOER is offline MOER  United States
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Default Amplifier design

Dending on your rails, the VAS transistors will not be Ok as far as dissipation is concerned. The pre-drivers (TIP41C/42C) are a very poor choice and are only rated at 100v Vceo so be careull

There are many TO220 driver pairs which are vastly superior to the antiqauted TIP series.

based on your post that you intend to replace the outputs with Tosh 5200/1943, I presume your rail voltages will be in the order of +/- 60 to +/-80v, am I correct?
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Old 30th January 2006, 03:27 PM   #4
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Default thank you

do u have any good design with exactly or higher than 200rms at 8ohms?..but not Fet trnasistors..thanl you

Ryan Jan..
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Old 30th January 2006, 03:30 PM   #5
edl is offline edl  Hungary
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Default Re: thank you

Quote:
Originally posted by clovi_kate
do u have any good design with exactly or higher than 200rms at 8ohms?..but not Fet trnasistors..thanl you

Ryan Jan..

Quote:
my power supply is higher than the supply of this design
What kind of psu have you got?

For 200W/8ohm-RMS you'll need about +/-75V...

Best regards,
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Old 30th January 2006, 04:26 PM   #6
MikeB is offline MikeB  Germany
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Default Re: Re: thank you

Quote:
Originally posted by edl

What kind of psu have you got?

For 200W/8ohm-RMS you'll need about +/-75V...

Best regards,
Hmm, i calculate 62v, including 5v rail losses ?

Mike
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Old 30th January 2006, 04:58 PM   #7
edl is offline edl  Hungary
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Sorry, I mistyped, it's +/-70V.
For true RMS 200W on 8ohm at such low as 20Hz and in every condition, using 2*10.000uF per channel I need: sqrt(200*16)+[(200/8)*sqrt2]+6 idle voltage. That means about 70V. My other formula gives the same 70V. So you need a 2*50V trafo.
Let's refer to Phase Linear 400, that produces 2*200W RMS on 8ohm, with +/-75V, with 5600uF caps in the psu.
Regards,
edl
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Old 30th January 2006, 05:04 PM   #8
MikeB is offline MikeB  Germany
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I obviously forgot the voltagedrop in the caps...

Mike
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Old 30th January 2006, 05:21 PM   #9
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Default Re: thank you

Quote:
Originally posted by clovi_kate
do u have any good design with exactly or higher than 200rms at 8ohms?..but not Fet trnasistors..thanl you

Ryan Jan..
try this one:
http://users.otenet.gr/~athsam/power_amp_300w.htm
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Old 31st January 2006, 01:04 AM   #10
clem_o is offline clem_o  Philippines
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Quote:
Originally posted by BlackMTX


try this one:
http://users.otenet.gr/~athsam/power_amp_300w.htm
Hmm, that doesn't look like a very stable design - there are improvements over the 1st schematic, in terms of power-supply decoupling of the input stages and constant-current source for their emitters; output SOA limiting - yet the input pair isn't balanced, the VAS is running wide open (save for an RC to one supply rail), rather lowish FB corner (330pF || 10K).

Cheers!
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