May 20, 2005 #1 MAKeller Junior Member level 1 Joined Mar 26, 2003 Messages 16 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 112 Gentlemen; I'm trying to find out how to simulate a potentometer and use it in a bridge circuit. I think the best way to do this is with a voltage controlled resistor. Maybe I should use a couple of VSRC's in a subcircuit. Have tried several ideas but the circuit doesn't output my expected values. It never swings negative. MAKeller
Gentlemen; I'm trying to find out how to simulate a potentometer and use it in a bridge circuit. I think the best way to do this is with a voltage controlled resistor. Maybe I should use a couple of VSRC's in a subcircuit. Have tried several ideas but the circuit doesn't output my expected values. It never swings negative. MAKeller
May 21, 2005 #2 papyaki Advanced Member level 2 Joined Apr 13, 2002 Messages 537 Helped 38 Reputation 76 Reaction score 19 Trophy points 1,298 Location France Activity points 5,346 Hi, An example of potentiometer simulation is given in the link below by using a ".param" statement : h**p://www.edn.com/archives/1997/032797/07di_01.htm Replace * by t
Hi, An example of potentiometer simulation is given in the link below by using a ".param" statement : h**p://www.edn.com/archives/1997/032797/07di_01.htm Replace * by t
May 21, 2005 #3 MAKeller Junior Member level 1 Joined Mar 26, 2003 Messages 16 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 112 Have tried the .PARM. It sweeps the resistor as it should. Unfortunely the output is positive only. It should sweep output both negative and positive. The wheatstone bridge is a differential circuit. A potentometer is often put in a bridge to produce a differential output. I am trying to simulate such a circuit. Thanks. MAKeller
Have tried the .PARM. It sweeps the resistor as it should. Unfortunely the output is positive only. It should sweep output both negative and positive. The wheatstone bridge is a differential circuit. A potentometer is often put in a bridge to produce a differential output. I am trying to simulate such a circuit. Thanks. MAKeller
May 22, 2005 #4 VVV Advanced Member level 5 Joined Nov 26, 2004 Messages 1,575 Helped 384 Reputation 768 Reaction score 88 Trophy points 1,328 Activity points 19,971 Either of the two methods will work. Please don't be offended by this question, but are you measuring the bridge's output voltage DIFFERENTIALLY ?
Either of the two methods will work. Please don't be offended by this question, but are you measuring the bridge's output voltage DIFFERENTIALLY ?
May 22, 2005 #5 MAKeller Junior Member level 1 Joined Mar 26, 2003 Messages 16 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 112 No offense taken, I have over 20 years experience and still learn new things everyday. I am measuring the output with .Probe (V+ - V-). Do you know of any other way? Any opinions or experiences are welcomed. I am using Pspice 8.0 , 9.2. MAKeller
No offense taken, I have over 20 years experience and still learn new things everyday. I am measuring the output with .Probe (V+ - V-). Do you know of any other way? Any opinions or experiences are welcomed. I am using Pspice 8.0 , 9.2. MAKeller
May 23, 2005 #6 D drasta Junior Member level 3 Joined Sep 15, 2004 Messages 26 Helped 1 Reputation 2 Reaction score 1 Trophy points 1,283 Activity points 221 I think that with .PARAM and .STEP PARAM you can sweep wide range and see what happends, you dont need some special model.
I think that with .PARAM and .STEP PARAM you can sweep wide range and see what happends, you dont need some special model.
May 24, 2005 #7 MAKeller Junior Member level 1 Joined Mar 26, 2003 Messages 16 Helped 1 Reputation 2 Reaction score 0 Trophy points 1,281 Activity points 112 Guys, I'm not having a problem sweeping the circuit, I just get the wrong output. Does anyone have experience simulating a wheatstone bridge circuit? Thanks. MAKeller
Guys, I'm not having a problem sweeping the circuit, I just get the wrong output. Does anyone have experience simulating a wheatstone bridge circuit? Thanks. MAKeller