Circuit for Determining Electrolytic Capacitor Polarity
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18
This article describes a low-cost circuit which can be used in a robotics system to determine whether an electrolytic capacitor is oriented correctly in the gripping mechanism and whether the capacitor falls within specifications. The circuit response to both positive and negative input current applied to the electrolytic capacitor is indicative of capacitor orientation and characteristics. Fig. 1 shows the circuit. A capacitor 10 under test is connected to the movable contacts of a three-position ganged switch 22. To test capacitor 10, the contacts are initially moved to the second position in which any charge on capacitor 10 can be dissipated through a resistor 12. The contacts are then moved to position 1.