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DC Circuits

  • K7-30: RLC CIRCUIT - RINGING

    K7-30
    Demonstrate ringing in a simple RLC circuit.
    A capacitor is charged and immediately connected to a series RLC circuit. The oscillation of the voltage across the capacitor of the RLC circuit is recorded using an oscilloscope. Pressing the red switch charges the capacitor; releasing the switch connects the capacitor back to the series RLC circuit, initiating the ringing effect. The circuit diagram is on the apparatus, as seen in the picture above. The oscilloscope is not shown in the picture.

  • K7-31: RLC CIRCUIT - OVER/UNDER/CRITICAL DAMPING

    K7-31
    Demonstrate over/under/critical damping in a series RLC circuit.
    The capacitor in an RLC series circuit is charged and then quickly allowed to discharge through the circuit. The series resistor is a potentiometer that can be adjusted to produce underdamping, critical damping, or overdamping, shown left-to-right in that order on the circuit assembly photograph above. The voltage across the capacitor is can be displayed on an oscilloscope (not shown).

  • K7-42: BARRICADE FLASHER

    K7-42
    Demonstrate a barricade flasher circuit.
    This is the device which is often seen along highways to call attention to a barricade in the road. It is a bit more complicated than a simple RC circuit, but does use an RC time constant to control the rate at which the lamp flashes. All of the circuit components are embedded in a block of waterproof plastic, which can make them hard to see in class.

  • K7-43: RELAXATION OSCILLATOR - NEON LAMP

    K7-43
    Demonstrate a pulse circuit with different pulse rates.
    A series RC circuit is used to control how fast the voltage builds up across a neon lamp, causing it to discharge. Substitute resistors and capacitor can be inserted into the clip-board circuit to change the flash rate. Be sure the components are making proper contact to form a circuit.
    K7