Hi all, I am very new to electronics. In the diagram shown here, where should I connect the pin of R4 variable resistor.
Electronic – Variable resistor wiring
currentpotentiometerresistanceresistorsvoltage
Related Solutions
There is a thing named resistance decade. It is like a programmable resistor, you can set the value and it precisely holds it. Costs about 100 to 1000 USD depending on precision and wattage.
Other cheaper solution is to buy a Resistor Assortment Kit. It includes 20-50 pcs of every value of resistors. You can find it on ebay from 10 USD
You can use a transistor to do this. Although less common that the other types, a JFET works much like a voltage controlled variable resistance. You'd have to apply an analog voltage to the gate to get a specific resistance. You'd have to be careful about the range of this voltage. The Drain and Source would act as the effective two terminal resistor. Even a mosfet has a linear resistive region so this is not your only option. There are many other options as well which I'm sure will be mentioned.
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Best Answer
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).
simulate this circuit – Schematic created using CircuitLab