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lycianz
Joined: 09 May 2008
Posts: 2
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 09 May 2008 19:08 Way to connect variable resistor with three terminal |
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| hi, can anyone tell me how to connect the variable resistor which consists three terminal. Show with pictures or circuit diagrams are better if possible. Thank you
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layoutmaster
Joined: 18 Mar 2008
Posts: 183
Helped: 27
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| 09 May 2008 19:19 Way to connect variable resistor with three terminal |
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| I would recommend you to realize about it by yourself by getting a tester connected to these terminals and modify the resistor value. You'll see in a few seconds how you're supposed to connect it...
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pakitos
Joined: 14 Nov 2005
Posts: 318
Helped: 38
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| 09 May 2008 19:32 Re: Way to connect variable resistor with three terminal |
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It is easy.
the first and last terminal will give you all the resistance of the resistor the middle is a varying point. To use it as a variable resitor choose any extrimity 1 or 3 and the middle pin.
the max value of the potentiometer or variable resistor is written on the component.
hope i have HELPED you
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Kral
Joined: 28 Mar 2005
Posts: 958
Helped: 156
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| 12 May 2008 22:20 Re: Way to connect variable resistor with three terminal |
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lycianz,
The most common failure mode for a potentiometer is an open wiper (pin 2 in pakitos' diagram). If an open circuit is unacceptable, it is a common practice to connect the wiper to one of the end terminals. That way, if the wiper opens up, you still have the end-to-end resistance in your circuit, rather than an open.
Regards,
Kral
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pakitos
Joined: 14 Nov 2005
Posts: 318
Helped: 38
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| 14 May 2008 12:11 Way to connect variable resistor with three terminal |
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What happens to the resistance value in that case?
The resistance will not reach the max value. Since you have made a short circuit.
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Kral
Joined: 28 Mar 2005
Posts: 958
Helped: 156
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| 14 May 2008 17:40 Re: Way to connect variable resistor with three terminal |
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Suppose that Pin 1 represents the terminal that the wiper approaches for maximum CCW roatation. Then Pin 3 represents the CW end. Suppose the wiper (pin 2) is connected to pin 3. If the wiper is adjusted fully CW (toward pin 3), then the resistance that appears between pin 1 and the wiper is the end-to-end resistance of the potentiometer. If you want the resistance to be maximum at the fully CCW direction, then you would connect the wiper to pin 1.
Regards,
Kral
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pouchito
Joined: 29 May 2006
Posts: 162
Helped: 22
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| 16 May 2008 14:40 Way to connect variable resistor with three terminal |
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Hi if pin 1 and pin2 are considered and pin 2 is connected to pin 3 by a short circuit.
If the wiper is put in the middle will the resistance be equal to Rmax/2 as before?
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Kral
Joined: 28 Mar 2005
Posts: 958
Helped: 156
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| 17 May 2008 19:29 Re: Way to connect variable resistor with three terminal |
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Yes, the mid-travel resistance from pin 1 to pin 2 is Rmax/2 whether pin 2 is connected to pin 3 or not.
Regards,
Kral
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pakitos
Joined: 14 Nov 2005
Posts: 318
Helped: 38
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| 18 May 2008 13:35 Way to connect variable resistor with three terminal |
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how is that?
if pin 2 is not connected to pin3
the resistance between 1 and 2 will vary from zero to Rmax and not to Rmax/2.
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