UcD like topology amp. - Page 2

Bender.ru · 2nd February 2008, 07:50 PM

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.

Bender.ru · 3rd February 2008, 11:56 AM

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.

Bender.ru · 3rd February 2008, 11:57 AM

2nd: 55W (1/2 max Pout)

Bender.ru · 3rd February 2008, 12:00 PM

Mininmum THD recieved at 32W output power level.

acid_k2 · 4th February 2008, 11:56 AM

Thd is not so bad.... with some peaks on 3° and 7° harmonic (not really good

), especially at half power...

Bender.ru · 4th February 2008, 12:14 PM

i hope, that i could improve thd figure with some changes in schematic & pcb layout.

Eva · 4th February 2008, 12:47 PM

Have you measured generator residuals?

Bender.ru · 4th February 2008, 12:56 PM

Eva, that generator do you mean? I don't understand you

phase_accurate · 4th February 2008, 01:05 PM

Hint: How many generators do you use for this test ?

Regards

Charles

Bender.ru · 4th February 2008, 01:19 PM

my only one thd test generator was emu1212m line out...so it's own thd level ~0.0004% @ 1kHz

.

4th February 2008, 12:47 PM	#17
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Have you measured generator residuals? __________________ I use to feel like the small child in The Emperor's New Clothes tale

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4th February 2008, 11:56 AM	#15
acid_k2 diyAudio Member Join Date: Oct 2006	Thd is not so bad.... with some peaks on 3° and 7° harmonic (not really good ), especially at half power...

4th February 2008, 12:14 PM	#16
Bender.ru diyAudio Member Join Date: Jan 2007 Location: Krasnogorsk-city	i hope, that i could improve thd figure with some changes in schematic & pcb layout.

4th February 2008, 12:56 PM	#18
Bender.ru diyAudio Member Join Date: Jan 2007 Location: Krasnogorsk-city	Eva, that generator do you mean? I don't understand you

4th February 2008, 01:05 PM	#19
phase_accurate diyAudio Member Join Date: May 2002 Location: Switzerland	Hint: How many generators do you use for this test ? Regards Charles

4th February 2008, 01:19 PM	#20
Bender.ru diyAudio Member Join Date: Jan 2007 Location: Krasnogorsk-city	my only one thd test generator was emu1212m line out...so it's own thd level ~0.0004% @ 1kHz .

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