Did you know that the DPDT (Double Throw Double Pole) switch can control up to four different devices? In this experiment we’ll see how the DPDT switch can be used to control multiple devices at the same time!


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6 Responses to “Control 4 LEDs”

  1. Aurora Lipper says:

    If you wanted to control three separate devices so that only one is powered at a time, you would need a single pole, triple throw (SP3T) switch. Triple through means the switch can direct the input to three different connections.

  2. arrowmakercpi says:

    How do you use a switch to control 3 devices? [if it can]

  3. Can you be more specific with your question so I can understand how to help?

  4. Rebecca Kharadia says:

    How?

  5. A crystal radio is among the simplest of radio receivers as there’s no battery or power source, and nearly no moving parts. The radio is made up of a tuning coil (magnet wire wrapped around a toilet paper tube), a detector
    (germanium diode) and crystal earphones, and an antenna wire. The crystal radio turns the radio signal directly into a signal that the human ear can detect. Since the radio does not use external power, the source of power
    comes directly from the radio waves themselves. This radio detects in the AM band that have been traveling from stations (transmitters) thousands of miles away.

    Here’s a quick overview of the different parts we’re going to use and how they work: The radio’s antenna is attached (as a tap) to the coil in the center. This is the part that ‘catches’ the radio waves and through electromagnetism, induces current to flow through the wire. Diodes are a ‘one-way street’ for electricity. We use one on our radio to cut the signal in half (“rectify” the signal), so the wave doesn’t cancel
    itself out so you wouldn’t hear anything. The crystal (or ceramic) earphone is a piezoelectric device that in effect
    changes size when a voltage is applied, enabling us to transform an electrical pulse into a mechanical sound vibration.
    The ground connection is where we will connect the circuit to a grounding source, like a metal pipe or a metal part of a lamp.

  6. I have completed the crystal radio project, and was wondering the in-depth reason why it works, could you please explain?