will select the next resistor value from R6, R8, R10, R12, R14, R16, R18, R20, R22, R24.
The circuit can also be controlled with pulse or digital input from any other source. The values of resistor R6, R8, R10, R12, R14, R16, R18, R20, R22, R24 can be changed to any required values or variable resistors can also be used in the place of these resistors to get exact required values. The two output points marked "Variable Resistor Connections" should be connected in the place of analog variable resistor.

The circuit is using two ICS, eleven transistors and few other passive components. The main components of the circuit are NE555 and CD4017 integrated circuits. The operating voltage can be any from 5V to 15V DC.


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The figure shows a useful project of digital variable resistor circuit, the circuit is very versatile and can be replaced with any analog variable resistor.
The circuit is having 10 different resistance stages that can be selected by pressing the push switch S1, each time the switch S1 is pressed the circuit will select the next resistor value from R6, R8, R10, R12, R14, R16, R18, R20, R22, R24.

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Digital Variable Resistor Circuit Diagram