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Old 19th September 2012, 02:18 AM   #301
masood is offline masood  India
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dear mooly,
thanks for sending these file plz.also send the pcb silk mooly b&w pdf .yes i am mad.to achieve some thing i only request .thanks masood
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Old 19th September 2012, 06:17 AM   #302
Mooly is online now Mooly  United Kingdom
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They are fantastic PCB's Alex.. absolutely top job
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Old 19th September 2012, 06:18 AM   #303
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by masood View Post
dear mooly,
thanks for sending these file plz.also send the pcb silk mooly b&w pdf .yes i am mad.to achieve some thing i only request .thanks masood
It is Alex you should be thanking for those, not me
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Old 19th September 2012, 10:48 AM   #304
masood is offline masood  India
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dear alex and mooly,
sorry,thanks both of you for sending these files plz.also send the pcb silk mooly b&w pdf .yes i am mad.to achieve some thing is not sin.it is only my request . thanks your's masood
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Old 19th September 2012, 11:03 AM   #305
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can i use +/-65vdc for this amplifier? do i need to modify something to used this supply thnx!
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Old 19th September 2012, 12:41 PM   #306
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by warrior007 View Post
can i use +/-65vdc for this amplifier? do i need to modify something to used this supply thnx!
Hmmm... thats high.

The basic topology would be fine. The VAS transistor and its current source would need different devices as their max rated dissipation would be exceeded. Perhaps TO126 types on small heatsinks for these. The laterals would be OK but the extra voltage means they are are going to see their dissipation rise so using 2 pairs per channel would be necessary. It would perhaps make sense to go to the 200V ones available from the likes of SEMELAB and Exicon/Profussion.

On any amplifier, when the supplies increase things start to get hot very quickly.
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Old 19th September 2012, 12:42 PM   #307
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by masood View Post
dear alex and mooly,
sorry,thanks both of you for sending these files plz.also send the pcb silk mooly b&w pdf .yes i am mad.to achieve some thing is not sin.it is only my request . thanks your's masood
The only PCB designs that I have are those already on this thread
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Old 19th September 2012, 01:11 PM   #308
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@Mooly
thnx, i will be using using 2SA1837\2SC4793
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Old 19th September 2012, 03:50 PM   #309
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Mooly, I noticed the 0.22 watt series resistor in the output - reason being?
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Old 19th September 2012, 04:16 PM   #310
Mooly is online now Mooly  United Kingdom
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Originally Posted by Nico Ras View Post
Mooly, I noticed the 0.22 watt series resistor in the output - reason being?
Hi Nico
Two reasons.
One was to supposedly emulate the higher output impedance of valve gear. The other was that 0.22 ohms alone is pretty much sufficient in itself to isolate the amp from capacitive loads (cables etc) even without the use of an output inductor although in the final design I included both.
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