Resistors

The pull-up resistor is very common and you’ll see it in digital circuits all the time. It’s just a resistor connected from an input up to VDD, the positive supply of the circuit. For example on digital inputs on an Arduino. Or the input of digital chips such as the 4000-series IC. Pull-up resistors are […]

Nooooo! It is not. It’s a common misunderstanding. But let me make it clear: The current after a resistor is the exact same as it was before the resistor. “But doesn’t the resistor reduce the current?”

I recently got a question about choosing a pull-up resistor value: Hey!In Monostable button triggered circuit, why did you connect 10 kΩ specifically? Does it contain any calculations? You can use resistors for many things. In the following 555 timer circuit that he was referring to, the resistor R2 is a pull-up resistor with a […]

The resistor color code (color bands) on your resistor tells you what value the resistor has. There are usually 4 or 5 bands. Use our simple resistor color code calculator below to easily find the value of a resistor. Click on a color band to change its color and see what the resulting value becomes. […]

Check out this simple tip that Michael sent me: [MICHAEL]:“I was making a small practice audio amplifier and was in need of a 2.5 Ohm resistor. I didn’thave one and didn’t want to wait for an order to be fulfilled.

“What is a resistor?” she asked. “It’s a component that resists the flow of current,” I said. “Hmm… I don’t get it. What does it do to my circuit?” she asked. “Well, it doesn’t actually do anything actively,” I said.

A current limiting resistor is a resistor that is used to reduce the current in a circuit. A simple example is a resistor in series with an LED. You would usually want to have a current limiting resistor in series with your LED so that you can control the amount of current through the LED. […]

There are many types of resistors. Learn how to choose a resistor with this simple guide.