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Picture of resistors

As the picture shows, is this a potentiometer, or is it supposed to be two resistors?

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The picture shows two potentiometers, each of value 100k. The wiper of each potentiometer is connected to a fixed resistor, one of 100k and one of 1M. Each fixed resistor is connected to what looks like a thermistor (the circled things marked 10k.)

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schematic

simulate this circuit – Schematic created using CircuitLab

Figure 1. Equivalent circuits.

  • R1 allows selection of a bias voltage between 0 and -12 V.
  • R2 limits the current from the bias to the next stage of the circuit.
  • Note that your coarse pot wiper resistor is 100 kΩ and the fine is 1 MΩ. If they both feed into the same circuit the fine pot adjustment will be ten times more sensitive than the coarse pot because the 1 MΩ resistor reduces its effect to one tenth that of the coarse pot.
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