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In this video Paul Carlson from Mr Carlson’s Lab tests three different types of capacitor to demonstrate their properties. You need to be careful in audio applications because capacitors can behave like microphones.
Hans Rosenberg runs us through what we should know about resistor noise and how to avoid it. The bottom line is to avoid carbon composition, thick film, carbon film, and metal oxide film; and prefer thin film, metal film, wirewound (watch inductance), and bulk metal foil (expensive but best).
In this video we build a variable brightness LED for use as a circuit for testing an ammeter which we will be making next week as we continue through Learning the Art of Electronics. This circuit will draw between 3 and 18 mA which should meet our requirements.
This humble build shows how to make a simple circuit from components connected to each other with DuPont cables, no circuit board required. Using the DuPont cables allows us to make the circuit in the air first for assembly and testing then allowing it to be installed in the project box piece by piece after it has been tested.
During testing we discover a problem whereby the circuit doesn’t power on. Investigation with the voltmeter indicates the problem is in the wiring of the DC barrel power socket. Once that gets fixed the circuit works and is ready for installation.
The convention I used to help me remember what connects to what is that a male DuPont connection is for an output and a female DuPont connection is for an input; things which connect to each other will preferably have the same colour wire.
After testing I use heat shrink around the various leads and wires. I also use a number of different sizes of drill bit in order to make the holes in the project box for the DC barrel power in, LED, potentiometer, and banana sockets.
The DC barrel power in, potentiometer, and banana sockets are bolted in with washers and nuts, whereas the LED is held in place with hot glue. If I need to remove the LED in future isopropyl alcohol is the antidote for hot glue.
I labeled the box as “5V LED”, which should help me remember what this thing does so I can use it again in the future, should I find myself needing to draw a few milliamps in a pinch.
The circuit diagram looks something like this:
And the finished product looks something like this:
Thanks very much for watching! And please remember to hit like and subscribe! :)
p.s. today I added potentiometer, isopropyl, milliamps, multimeter, and tweezering to my spell check.
Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!
Here’s something fun. It’s a computer game based around building a web site and making it popular. It’s built entirely from CSS and HTML, no JavaScript needed! See: CSS Clicker.
