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Chip Amps Amplifiers based on integrated circuits

Beginner's Gainclone guide
Beginner's Gainclone guide
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Old 23rd June 2003, 06:29 AM   #41
gchrist is offline gchrist
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Default Regulated power supply

Why is the power supply for the Gainclone not regulated? If it was regulated would the performance be better?

Thank you
George
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Old 23rd June 2003, 11:25 PM   #42
ukram is offline ukram  Finland
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The LM3875 has 120 dB supply noise rejection. According to my measurement with RMAA and soundcard, inverting gainklone has 82 dB S/N ratio, so regulating supply voltages does not make sense, as long as there is enough voltage to drive the speakers.
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Old 24th June 2003, 12:04 AM   #43
pinkmouse is offline pinkmouse  Europe
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Beginner's Gainclone guide
Default Re: Regulated power supply

Quote:
Originally posted by gchrist
Why is the power supply for the Gainclone not regulated? If it was regulated would the performance be better?
Fred built one, and his results are here.
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Old 24th June 2003, 05:26 PM   #44
li_gangyi is offline li_gangyi  Singapore
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I still dun get it...does the amp need positive negative supplies?? like +-30V ?? I'm sorry but the tranny wiring picture is down....one myside at least..wonder why??
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Old 30th June 2003, 02:51 AM   #45
alvinlim is offline alvinlim  Malaysia
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Default Grounding scheme

Hi...

I am kind of confused on the grounding scheme. I understand the need for both star and power grounds. In the schematics, the power ground is connected to the DC 0V "G" which is correct.

Do I need to connect the Power Ground (PG) to "Earth" (the mains earth wire). In the beginners guide, it mentioned that we should connect the PG to earth via a 100 Ohm resistor and a 0.22microf capacitor. Why do we need that?

Regards

Alvin
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Old 1st July 2003, 08:45 AM   #46
alvinlim is offline alvinlim  Malaysia
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Default speculation

just a guess - is the resistor to make cure that the P(G) is always positive with regards to the earth?
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