LME49713

Johnloudb · 18th October 2012, 10:42 PM

I had a question about this current feedback op-amp for use at the input of an active discrete JFET crossover design. It has an input bias current of 1.8uA typ which is kind of high.

This could lead to a large DC offset if I just slap a 25kohm volume pot on the the non-inverting input, right? I've just never used a current feedback op-amp before.

I planned on using it just using it as a buffer at the input of the JFET crossover, and for voltage gain. Perhaps I should look to a JFET input op-amp? Maybe the LME48720?

Johnloudb · 07:23 AM

Okay, to keep the DC offset low, I could add a servo connected to the potentiometer. But I don't really need a volume control on the high frequencies, and the high pass crossover is capacitively coupled anyway. On the low pass i'll use the LME49720 op amp.

So, I don't need any help.

18th October 2012, 10:42 PM	#1
Johnloudb diyAudio Member Join Date: Feb 2008	LME49713 I had a question about this current feedback op-amp for use at the input of an active discrete JFET crossover design. It has an input bias current of 1.8uA typ which is kind of high. This could lead to a large DC offset if I just slap a 25kohm volume pot on the the non-inverting input, right? I've just never used a current feedback op-amp before. I planned on using it just using it as a buffer at the input of the JFET crossover, and for voltage gain. Perhaps I should look to a JFET input op-amp? Maybe the LME48720? __________________ My Website: Hyperacusis, Tinnitus, My Story

19th October 2012, 07:19 AM	#2
Johnloudb diyAudio Member Join Date: Feb 2008	Okay, to keep the DC offset low, I could add a servo connected to the potentiometer. But I don't really need a volume control on the high frequencies, and the high pass crossover is capacitively coupled anyway. On the low pass i'll use the LME49720 op amp. So, I don't need any help. __________________ My Website: Hyperacusis, Tinnitus, My Story Last edited by Johnloudb; 19th October 2012 at 07:23 AM.

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