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Hi all, I am very new to electronics. In the diagram shown here, where should I connect the pin of R4 variable resistor.

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    \$\begingroup\$ Have you read this: en.wikipedia.org/wiki/Potentiometer ? If not, do so now. With just a tiny bit of effort you can understand how such a resistor is build and from that figure out how to connect it. Also just measuring one with a multimeter can be very educational. \$\endgroup\$ – Bimpelrekkie Feb 23 '17 at 10:24
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    \$\begingroup\$ "the pin" if your R4 only has one pin you are doing something wrong. \$\endgroup\$ – PlasmaHH Feb 23 '17 at 10:27
  • \$\begingroup\$ Show us the picture of your variable resistor. How many pins your variable resistor has? \$\endgroup\$ – soosai steven Oct 26 '18 at 10:20
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Actually you can see this component like two singles resistors mounted in dividing bridge.
Admitting you want to divide a 10V supply, the resulting voltage of the divider is in the middle of the potentiometer and the ground (in this case).

schematic

simulate this circuit – Schematic created using CircuitLab

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Just connect the wiper terminal to any of the other 2 terminals and you'll be fine. This way, a part of the total resistance gets shorted and current only flow through the rest of it (thus becoming your variable resistor).

schematic

simulate this circuit – Schematic created using CircuitLab

However, be careful: when applying a voltage to a potentiometer connected like this, you may easily exceed its current rating if you reduce to much its resistance value. You may want to add a fixed current limiting resistor in series to avoid this.

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