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  • August 29,2016

    Probe a Pushbutton Switch

    A pushbutton switch is a type of tactile (meaning touch) switch, which is an on/off switch that is activated when pressure is applied to it (usually b...

  • August 29,2016

    How a Speaker Works

    The figure shows the front and back of one type of mini-speaker. Speakers usually come with leads attached. The leads are twisted together to keep thi...

  • August 29,2016

    What Is a Potentiometer?

    Pot is the shortened name for a potentiometer. A potentiometer (pronounced “poe-ten-shee-AH-meh-ter”) is a variable resistor. The pot enab...

  • August 29,2016

    What’s an Integrated Circuit?

    Discrete components are individual electronic devices, such as resistors, capacitors, LEDs, and transistors. You connect the components as you build c...

  • August 29,2016

    Check Out a PNP Transistor

    Look at the two 2N3906 PNP transistors shown here. Do they look like the 2N3904 NPN transistor? Yup. Does it matter if you get the 2N3904 and 2N3906 t...

  • August 29,2016

    What Is a Photoresistor?

    A photoresistor, which is also called a light-dependent resistor (LDR) or photocell, consists of a piece of semiconductor material that exhibits an in...

  • August 29,2016

    Meet the 1N4148 (or 1N914) Diode

    Diodes do a simple but important job: They allow current to flow in just one direction. A special kind of diode — a light-emitting diode, or LED —...

  • August 29,2016

    Why Use a Transistor?

    To get an idea of how important a transistor is in a circuit, think about a circuit that changes the dimming time of an LED. This circuit is set up wi...

  • August 29,2016

    Why Use Capacitors?

    Capacitors are extremely useful in electronics and, chances are, you’ve used them many times without realizing it. Here are some places where yo...

  • August 29,2016

    Electrolytic Capacitors

    Electrolytic capacitors are polarized, which means the way that they are connected in a circuit matters. A 470 microfarad electrolytic capacitor is sh...