Different GC

gengcard · 16th July 2004, 08:39 AM

I did some design of GC from my idea and simulate it by Spice. I got good result from the simulation.

But some mistake maybe occured that I don't know

. Please help me to consider and comment this circuit.

getafix · 16th July 2004, 09:12 AM

I think you meant to attach the schematic diagram

gengcard · 17th July 2004, 03:42 AM

Yes, I meant the schematic. I think that it's missing.

I would attach it again.

Groucho2004 · 17th July 2004, 01:23 PM

This does not work. Since you are feeding the input signal to the inverted inputs of each amp the signal between the output pins will be zero (however, there will be a signal between each output pin and ground).

gengcard · 17th July 2004, 03:20 PM

Thank you for the comment. From simulation result, output signal is not zero but it's amplified sine signal.

Groucho2004 · 17th July 2004, 03:44 PM

Ignore my previous post. That was a brainfart. I was thinking about something completely different.
What is your specific problem with this circuit?

analog_sa · 17th July 2004, 05:12 PM

I don't see anything strange or unusual other than the very low input impedance. Just a balanced GC - pretty much the same as a bridged GC only lacking the inversion stage.

gengcard · 18th July 2004, 04:09 AM

Yes, it's a kind of balanced GC but different a little bit. From your comment, how much should input impedance be?

djk · 18th July 2004, 03:50 PM

Your input impedance is 1K in parallel with 47K, or 979 ohms.

gengcard · 20th July 2004, 02:38 AM

Yes, I thought it's too low input impedance. I think I will change all R 1k to be 40k and feedback resistance will be change to be 800k or 1M. I think it'll be better.

16th July 2004, 08:39 AM	#1
gengcard diyAudio Member Join Date: Jun 2004 Location: Bangkok	Different GC I did some design of GC from my idea and simulate it by Spice. I got good result from the simulation. But some mistake maybe occured that I don't know . Please help me to consider and comment this circuit.

16th July 2004, 09:12 AM	#2
getafix diyAudio Member Join Date: Jun 2003 Location: somewhere in Mandaluyong	I think you meant to attach the schematic diagram __________________ forever dreaming of a better set-up...

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17th July 2004, 01:23 PM	#4
Groucho2004 diyAudio Member Join Date: Jul 2004 Location: Barcelona	This does not work. Since you are feeding the input signal to the inverted inputs of each amp the signal between the output pins will be zero (however, there will be a signal between each output pin and ground).

17th July 2004, 03:20 PM	#5
gengcard diyAudio Member Join Date: Jun 2004 Location: Bangkok	Thank you for the comment. From simulation result, output signal is not zero but it's amplified sine signal.

17th July 2004, 03:44 PM	#6
Groucho2004 diyAudio Member Join Date: Jul 2004 Location: Barcelona	Ignore my previous post. That was a brainfart. I was thinking about something completely different. What is your specific problem with this circuit?

17th July 2004, 05:12 PM	#7
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	I don't see anything strange or unusual other than the very low input impedance. Just a balanced GC - pretty much the same as a bridged GC only lacking the inversion stage.

18th July 2004, 04:09 AM	#8
gengcard diyAudio Member Join Date: Jun 2004 Location: Bangkok	Yes, it's a kind of balanced GC but different a little bit. From your comment, how much should input impedance be?

18th July 2004, 03:50 PM	#9
djk diyAudio Member Join Date: Feb 2001 Location: USA	Your input impedance is 1K in parallel with 47K, or 979 ohms.

20th July 2004, 02:38 AM	#10
gengcard diyAudio Member Join Date: Jun 2004 Location: Bangkok	Yes, I thought it's too low input impedance. I think I will change all R 1k to be 40k and feedback resistance will be change to be 800k or 1M. I think it'll be better.

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