NonInverting Gain Amounts

MantramAudio · 11th August 2003, 04:32 AM

Has anyone experimented with other gain than 20-30 which is what showed up as the norm when I searched this forum? General consensus is that the lower values the better, but has anyone tried gains between 10-18 or so? Is stability THAT big of a problem below gain=20?

Reason I ask, is that I don't need the power of the 3875 or even the 1875, but thought less gain would be better than attenuation of the input. My rails will be +/- 23 VDC and I'll be using the 1875.

Nik

ghetto · 11th August 2003, 05:35 PM

You should try basing your design on the inverting technique, you can even go as far as gain=1, most people believe it sounds better too

jackinnj · 11th August 2003, 05:54 PM

Nat Semi is pretty clear on setting the gain, given the supply rails and load.

MantramAudio · 11th August 2003, 05:55 PM

For many reasons, I'm sticking with the non-inverting amp at the moment. The main one is too many factors affect the feedback circuit on an inverting amp. There are less variables on the noninverting one: 2 resistors, and signal ground. On the inverting amp, you have the attenuator, dc blocking cap, wire, etc.

11th August 2003, 04:32 AM	#1
MantramAudio diyAudio Member Join Date: Aug 2003 Location: Alabama, USA	NonInverting Gain Amounts Has anyone experimented with other gain than 20-30 which is what showed up as the norm when I searched this forum? General consensus is that the lower values the better, but has anyone tried gains between 10-18 or so? Is stability THAT big of a problem below gain=20? Reason I ask, is that I don't need the power of the 3875 or even the 1875, but thought less gain would be better than attenuation of the input. My rails will be +/- 23 VDC and I'll be using the 1875. Nik

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11th August 2003, 05:35 PM	#2
ghetto diyAudio Member Join Date: Jul 2003 Location: Oklahoma	You should try basing your design on the inverting technique, you can even go as far as gain=1, most people believe it sounds better too

11th August 2003, 05:54 PM	#3
jackinnj diyAudio Member Join Date: Apr 2002 Location: Llanddewi Brefi, NJ	Nat Semi is pretty clear on setting the gain, given the supply rails and load.

11th August 2003, 05:55 PM	#4
MantramAudio diyAudio Member Join Date: Aug 2003 Location: Alabama, USA	For many reasons, I'm sticking with the non-inverting amp at the moment. The main one is too many factors affect the feedback circuit on an inverting amp. There are less variables on the noninverting one: 2 resistors, and signal ground. On the inverting amp, you have the attenuator, dc blocking cap, wire, etc.

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