Development of a "reference" class D starting point - Page 41

JohnW · 9th August 2004, 10:48 AM

Chris,

Don’t you ever sleep? If your in Canada then your worst then me…

Enter the DARKER side - why small, in this circuit topology I was thinking of say 470R or bigger!

John

classd4sure · 9th August 2004, 10:54 AM

Sleep??.. they come in my dreams...

heh.

The higher Rb the higher the driver bias resistors need to be, which are 460ohm right now. I could possibly go higher but 460 Rb.. likely something like 2k for the driver resistors.

Bruno you can't be hinting to DC feedback can you?

Regards,
Chris

Bruno Putzeys · 9th August 2004, 11:09 AM

Quote:

Originally posted by classd4sure
Bruno you can't be hinting to DC feedback can you?

Goodness no, that would be a "Japanese" solution.

I'm telling you it's simple. When you find it you'll recognise it straight away because you'll be banging your head why you hadn't thought of it before.

Come to think of it, wasn't that the reaction here about the whole UcD thing?

classd4sure · 9th August 2004, 11:19 AM

Hmmm,

Care to confirm if your method happens to use "1" resistor?

Bruno Putzeys · 9th August 2004, 11:24 AM

The modification adds 3 parts, none of which is a resistor.

classd4sure · 9th August 2004, 11:25 AM

Really, I think I just did it with the same number of parts. It works.

classd4sure · 9th August 2004, 11:39 AM

Ok I take it back, doesn't work good enough. I'll have to sleep on this one.

subwo1 · 9th August 2004, 12:45 PM

Hi Bruno,
Your way even uses a part less than emitter resistors, I think.:-)

JohnW · 9th August 2004, 02:06 PM

You would only need to add 2 Emitter Resistors....

classd4sure · 9th August 2004, 02:32 PM

Hi,

This is what I'm working with (see attached).

BTW John, it seems with 3.2k driver bias resistors 460Rb works fine. Could possibly go even higher.

Regards,
Chris

9th August 2004, 10:48 AM	#401
JohnW diyAudio Member Join Date: Jan 2004 Location: Discovery Bay, Prague, Paris...	Chris, Don’t you ever sleep? If your in Canada then your worst then me… Enter the DARKER side - why small, in this circuit topology I was thinking of say 470R or bigger! John __________________ Life shouldn’t be take it too seriously, you will not come out alive anyway…

9th August 2004, 12:45 PM	#408
subwo1 diyAudio Member Join Date: Jan 2002 Location: North American Continent	Hi Bruno, Your way even uses a part less than emitter resistors, I think.:-) __________________ USMPS http://groups.yahoo.com/group/switchmode/

9th August 2004, 02:06 PM	#409
JohnW diyAudio Member Join Date: Jan 2004 Location: Discovery Bay, Prague, Paris...	You would only need to add 2 Emitter Resistors.... __________________ Life shouldn’t be take it too seriously, you will not come out alive anyway…

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9th August 2004, 10:54 AM	#402
classd4sure Account Disabled Join Date: Feb 2004	Sleep??.. they come in my dreams... heh. The higher Rb the higher the driver bias resistors need to be, which are 460ohm right now. I could possibly go higher but 460 Rb.. likely something like 2k for the driver resistors. Bruno you can't be hinting to DC feedback can you? Regards, Chris

9th August 2004, 11:19 AM	#404
classd4sure Account Disabled Join Date: Feb 2004	Hmmm, Care to confirm if your method happens to use "1" resistor?

9th August 2004, 11:24 AM	#405
Bruno Putzeys diyAudio Member Join Date: Apr 2004 Location: BE/NL/RW/ZA	The modification adds 3 parts, none of which is a resistor.

9th August 2004, 11:25 AM	#406
classd4sure Account Disabled Join Date: Feb 2004	Really, I think I just did it with the same number of parts. It works.

9th August 2004, 11:39 AM	#407
classd4sure Account Disabled Join Date: Feb 2004	Ok I take it back, doesn't work good enough. I'll have to sleep on this one.

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