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Old 2nd February 2008, 06:50 PM   #11
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Hello MaxS, power supply is 40V per rail, higher voltage possible with IRFI4020H-117P (or something like that). Output power can be easily calculated.
Project will be shared after all measurements be done.

Next 20kHz sine:

1st: input 0.2V/div*10us/div
2nd: output 10V/div*10uS/div

load: 6.5Ohm resistor.
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Old 3rd February 2008, 10:56 AM   #12
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Here is some thd measurements, nothing incredible or outstanding . Next pcb version is comming soon (or not soon).

Equipment: emu1212m, 24k lowpass filter (AES-17), load - good old 6.5Ohm resistor, PSU 250W torroid with 20000uF per 40V rail.

1st: 1W.
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Old 3rd February 2008, 10:57 AM   #13
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2nd: 55W (1/2 max Pout)
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Old 3rd February 2008, 11:00 AM   #14
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Mininmum THD recieved at 32W output power level.
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Old 4th February 2008, 10:56 AM   #15
acid_k2 is offline acid_k2  Italy
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Thd is not so bad.... with some peaks on 3 and 7 harmonic (not really good ), especially at half power...
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Old 4th February 2008, 11:14 AM   #16
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i hope, that i could improve thd figure with some changes in schematic & pcb layout.
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Old 4th February 2008, 11:47 AM   #17
Eva is offline Eva  Spain
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Have you measured generator residuals?
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Old 4th February 2008, 11:56 AM   #18
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Eva, that generator do you mean? I don't understand you
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Old 4th February 2008, 12:05 PM   #19
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Hint: How many generators do you use for this test ?

Regards

Charles
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Old 4th February 2008, 12:19 PM   #20
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my only one thd test generator was emu1212m line out...so it's own thd level ~0.0004% @ 1kHz .
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