The positive side of a battery connects to the upper stationary contact of a single pole double throw switch. The negative side of the battery connects to the circuit common. The lower stationary contact of the switch also connects to the circuit common. The swinger of the switch connects to one end of a resistor. The other end of the resistor connects to one end of a capacitor. The other end of the capacitor connects to circuit common. A rectangular block is labeled sensor and one lead connects from the junction of the resistor and capacitor to the sensor. The other lead of the sensor connects to the circuit common.
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