BPA200 without DC-servo - Page 4

Professor · 13th August 2007, 07:14 PM

More close to a theme, you do not advise to use these capacitors?

AndrewT · 14th August 2007, 07:17 AM

Quote:

Originally posted by AndrewT
22uF sounds a bit big for a DC blocking cap.
What do you propose for the DC blocking back at the source, if any?
What is the Zin you propose at the power amp.

I am of the opinion that the DC blocking caps should set the Low frequency bandwidth of the amplifier. Setting this high pass filter too low then defeats that philosophy.

This post explained why I thought that 22mF was not appropriate.

Professor · 14th August 2007, 01:19 PM

Quote:

Originally posted by AndrewT
This post explained why I thought that 22mF was not appropriate.

Then why in AN-1192 use 22uF ?

peranders · 14th August 2007, 01:24 PM

Quote:

Originally posted by AndrewT
If non-inverting mode is that bad then why do almost all discrete power amps and discrete opamps use the non-inverting mode?

You must have all pros and cons of each mode, then you'll have to deside. Nothing is black and white you know.

AndrewT · 14th August 2007, 02:17 PM

Quote:

Originally posted by AndrewT
What's the point in marking caps with 4 or 5 significant figures and then stating the tolerance is "J".
What have Jentsen (if that's the spelling) put in their soup?

22uF sounds a bit big for a DC blocking cap.
What do you propose for the DC blocking back at the source, if any?
What is the Zin you propose at the power amp.

I am of the opinion that the DC blocking caps should set the Low frequency bandwidth of the amplifier. Setting this high pass filter too low then defeats that philosophy.

The an1192 schematic has some odd component values.
See comments in other threads.

I am referring to the input cap. Those filters set, or at least should, the bandwidth of the amplifier. The 22uF in the NFB should be set to a lower frequency. That is why I said the 22uF PP soundwed a bit big and why I asked if there was a second DC blocking cap back at the source.

Professor · 14th August 2007, 06:44 PM

Quote:

Originally posted by AndrewT

I am referring to the input cap. Those filters set, or at least should, the bandwidth of the amplifier. The 22uF in the NFB should be set to a lower frequency. That is why I said the 22uF PP soundwed a bit big and why I asked if there was a second DC blocking cap back at the source.

I have understood. Strange, but I really had an idea to put 22uF on an input

Professor · 21st August 2007, 08:42 PM

Soft start and power supply for one monoblock

Professor · 21st August 2007, 08:44 PM

PSB

Professor · 21st August 2007, 08:45 PM

Soft start board

Professor · 21st August 2007, 08:49 PM

.

13th August 2007, 07:14 PM	#31
Professor diyAudio Member Join Date: Sep 2005 Location: Electrostal, Moscow region	More close to a theme, you do not advise to use these capacitors? __________________ http://mymegahobby.jimdo.com/

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