Four Biggest 555 Timer Circuit Mistakes
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Four Biggest 555 Timer Circuit Mistakes

“Why isn’t my 555 timer circuit working?!” Avoid these four common pitfalls!  

555 Timer Book Chpt 7
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My 555 Book, Chpt. 7 recap: Audible Anarchy with the Atari Punk Console

Companion video for The Ultimate Beginner’s Guide to the 555 Timer, Chapter 7: Audible Anarchy

555 Timer Book Chpt 1
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My 555 Book, Chpt. 1: How to use a breadboard, transfer schematics to a working circuit

Companion video for The Ultimate Beginner’s Guide to the 555 Timer, Chapter 1: Breadboard Basics

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My new book: The Ultimate Beginner’s Guide to the 555 Timer

Build the Atari Punk Console and Other Breadboard Electronics Projects. Plus, a complete parts kit!

Make the World’s cheapest MIDI Tester
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Video: Make the World’s cheapest MIDI Tester

A quick and dirty (and cheap) MIDI tester.

Audio breakout cable for ipod/iphone

(update) I inadvertently said I got the 4 conductor plug at Jameco – it was Mouser, and is listed correctly, with the part number in the blog. Have you ever wanted to plug in a professional studio mic to your iPod touch/iPhone? There may be a commercial solution, but I…

How to invert a photocell’s resistance

It takes lots of experimenting to find the right values of the parts.

Simple audio amplifier

This is one of the simplest designs of audio amp I’ve found. Can be built for a couple dollars!

How to wire up a RCA patchbay

I get a lot of e-mails asking about hooking up patchbays to bend points. Here are a couple different methods. Remember – you can expand these ideas across multiple patch panels, hook up switches and pots in between, etc. A) In this method, each RCA jack is wired/soldered to an…

Adding a 1/4in. output & volume knob

Keypad matrix diagram

This is for a large 20 key keypad, but the theory works the same for smaller keypads. You can use an ohm meter to see which rows & columns get connected with each button press.