PSN-L Email List Message

Subject: line driver question
From: Barry Lotz barry_lotz@.............
Date: Tue, 14 Mar 2006 20:59:58 -0800 (PST)


Hi All
   I was planning to put a line driver on the position voltage output of my vbb style sensor. Currently I run it directly about 40' to my house but I think it affects the triple feedback circuit. The simple way is to put a non-inverting follower at the circuit output. The question is (lets see if I can explain this) the non-inverting opamp on the velocity output of the sensor has a small resistor between the output of the opamp (~10 ohms) and the line going back to the negative opamp input and a small (pf) capacitor between the opamp output and the negative input . I think this is for damping high frequency oscillations. Should I use this with the unity gain follower? I'm not sure if its necessary or how to do this. The only way I can think of is to put a high resistor (~100k) before the positive opamp input and a 100k in the line going back to the negative input and then put the small cap and resistor as noted above. I'm not sure that this will acomplish anything.
  I didn't want to have a voltage divider before the non inverting opamp to reduce the voltage in half and then have a 2X noninverting opamp line driver. I think the voltage divider will affect the current flow to my feedback coil.
  Regards
  Barry 
Hi All
 I was planning to put a line driver on the position voltage output of my vbb style sensor. Currently I run it directly about 40' to my house but I think it affects the triple feedback circuit. The simple way is to put a non-inverting follower at the circuit output. The question is (lets see if I can explain this) the non-inverting opamp on the velocity output of the sensor has a small resistor between the output of the opamp (~10 ohms) and the line going back to the negative opamp input and a small (pf) capacitor between the opamp output and the negative input . I think this is for damping high frequency oscillations. Should I use this with the unity gain follower? I'm not sure if its necessary or how to do this. The only way I can think of is to put a high resistor (~100k) before the positive opamp input and a 100k in the line going back to the negative input and then put the small cap and resistor as noted above. I'm

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