Building upon my last video, I’ve decided to make a simple circuit using some op-amps. One is the general op-amp LM741. The other is a specific op-amp, LM386, that is designed for audio amplification. This circuit can be used to amplify microphones or be used as a circuit sniffer depending on what you connect to […]
In this video, I will show you a few of my most used helpful circuits. They involve using the 555 timer and the Operational Amplifier.
Chris Connors shows his technique for storing resistors. Executive summary: he sorts by the 3rd color band! Over the years, I’ve seen and inherited parts bins with every drawer labeled for a single value resistor. This can take up dozens of drawers in a rack. It also makes returning the resistors a pain, because you […]
Instructables user caitlinsdad modified a Mho the Resistor plushie with color bands glued to PVC rings serving as a resistor value decoder. He also modded a Ruby the Red LED plushie to
I love this Ohm’s poster by ZarthCode’s Anthony Clay. In addition to the classic Ohm’s Law triangle (“It’s the Law!” the poster proclaims) it also includes a resistor color chart, a discussion of voltage dividers, as well as an explanation of the markings on surface mount resistors. Just the thing for a hackerspace! The poster […]
MAKE alumnus and supernerd Collin Cunningham rhapsodizes about everyone’s favorite current-fighting backbone of circuitry–the resistor–in this classic MAKE video. Collin talks about Ohm’s Law, resistor color codes, and using pencil graphite to make paper resistors.
Instructables user science4u used this simple arrangement to create an ad hoc paper resistor — a strip of heavy paper with pencil lead limiting the flow of current, with precisely spaced paperclips serving as leads. Desperate for a 10K? Draw your own! [Thanks, Laura!]
