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Class D Switching Power Amplifiers and Power D/A conversion

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Old 17th December 2007, 01:23 PM   #41
zox2003 is offline zox2003  United States
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Eva,

What components are you looking for (RF elimination)?
On Botom side I have 6 bypass SMT capacitors (0.1uF---3 per rail) very close to output FET's (collector to GND and emmiter to GND).Additionaly each rail has 1000uF and 0.22 uF capacitors to GND.

PS.

Can you give me a link with your oscilloscope captures so I can compare them to mine?

Regards,
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Old 17th December 2007, 02:41 PM   #42
Eva is offline Eva  Spain
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My waveforms:

http://www.diyaudio.com/forums/showt...13#post1364013

The last two pictures show some 100Mhz local resonance in Vds because the probe is connected directly to the TO-220 metal tab of the low side transistor and some internal package resonance is unavoidable. It does not progpagate outside TO-220 legs, though (as gate waveform tells).
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Old 17th December 2007, 02:49 PM   #43
zox2003 is offline zox2003  United States
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On Botom side I have 6 bypass SMT capacitors (0.1uF---3 per rail) very close to output FET's (collector to GND and emmiter to GND).Additionaly each rail has 1000uF and 0.22 uF capacitors to GND.

Output FET's are IRF540z.
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Old 17th December 2007, 02:56 PM   #44
Eva is offline Eva  Spain
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I also use IRF540Z, three 100nF 50V SMD chip capacitors per rail and channel, 1uF 100V "dampers" and 4700uF 35V main capacitors.

I'm really curious about your waveforms.
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Old 17th December 2007, 03:16 PM   #45
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Quote:
Originally posted by zox2003
Why would I if everything works fine?
PCB is double sided also...

Because it will pick-up noise from vdd... and your waveforms will look ugly in comparision with Eva scope results...
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Old 2nd January 2008, 01:22 AM   #46
zox2003 is offline zox2003  United States
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First, happy new year to everybody...and last night I used my amps to power up two sets of profesionall speakers (3 way) including bass speaker two.No issues at all.They were running for 4 hours (new year eve) on full power ..get warm.I will post pictures soon of compleated amplifier (in box).I am very happy with results and sound quality.I love them.

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