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Old 27th December 2008, 12:52 PM   #501
m2003br is offline m2003br  Brazil
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and this:
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Old 27th December 2008, 12:53 PM   #502
roender is offline roender  Romania
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Quote:
Originally posted by pooge
What is the maximum voltage drop the PSU regulator can do, so we can know the voltage range for acceptable transformers. Also, what is the minimum and maximum difference acceptable between the PS voltage delivered to the input stage and that to the output stage?
At least 5 volts between input and output
The front end PSU must deliver 5...8 volts over the output stage PSU in order to cover headroom lost by folded cascode bias voltages

Best regards,
Mihai
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Old 27th December 2008, 12:58 PM   #503
pooge is offline pooge  United States
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Quote:
Originally posted by roender


It is better now?

Much. Thanks.
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Old 27th December 2008, 01:04 PM   #504
m2003br is offline m2003br  Brazil
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I think I achieved a better one for the amp board.
Happy new year for all!
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Old 27th December 2008, 01:05 PM   #505
pooge is offline pooge  United States
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Default Re: layouts

Quote:
Originally posted by m2003br
Hope this may help:

The labelling would be much more readable if you dropped the circuit pattern and left just the vias. Also, there was a tweak for C1 with the addition of a series resistor.
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Old 27th December 2008, 01:23 PM   #506
m2003br is offline m2003br  Brazil
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Hello Pooge,
Better now?
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Old 27th December 2008, 01:50 PM   #507
m2003br is offline m2003br  Brazil
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Mihai,

What you think about the use of a better and bigger resistor in the NFB (R24 - 22K)?

Thank you,
Marcos
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Old 27th December 2008, 01:57 PM   #508
pooge is offline pooge  United States
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Quote:
Originally posted by roender


At least 5 volts between input and output

Best regards,
Mihai
Are you talking about the regulator board here? If so, what is the maximum allowable input voltage?
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Old 27th December 2008, 02:09 PM   #509
roender is offline roender  Romania
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Quote:
Originally posted by pooge


Are you talking about the regulator board here? If so, what is the maximum allowable input voltage?

Yes.
The max input voltage? Don't know, never think about ... depends on how big the PSU heat sink is and SOA of the used CCS transistor.
With specified parts and 39V output voltage I wouldn't go over 55V input voltage
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Old 27th December 2008, 02:19 PM   #510
roender is offline roender  Romania
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Quote:
Originally posted by m2003br
Mihai,

What you think about the use of a better and bigger resistor in the NFB (R24 - 22K)?

Thank you,
Marcos
If you think that using a bigger wattage resistor is better for the sound, go ahead, no problemo! I believe that there is some space on PCB for 1w RPM resistor but no more than that
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