555 Time Lapse Intervalometer

555 Intervalometer camera connectionThis is my entry for the 555 Contest recently started by Jeri Ellsworth and Chris Gammell. It is a camera timer (aka. intervalometer) for taking time lapse videos with my DSLR. It is a very simple circuit designed around a 555 timer IC. It has indicator LEDs, a relay to control the camera, and a potentiometer which allows me to set the photo interval between 15 seconds down to around 1 second.

Continue reading 555 Time Lapse Intervalometer

DIY HDTV TV Antenna (Bowtie)

DIY HDTV Antenna

Build your own HDTV TV Antenna to cut the cord from your cable provider and save $1000 a year. This DIY antenna is very easy to build with just a few basic tools and a few supplies available from the hardware store.

After being disappointed with the current channel offerings and ever increasing price of our local cable provider, we recently decided to disconnect our cable TV service and go for over the air broadcasts as well as the many online services available now. I built this DB4 antenna, also called a bowtie antenna, to increase the rang of signals I could pick up over the basic rabbit ears antenna.

Continue reading DIY HDTV TV Antenna (Bowtie)

How to Read a Resistor Color Code

Resistor Colour CodeHere is a nice resistor color (colour for some of you) code diagram I ran across online. I used to read resistors so often that I didn’t need a guide, but It has been so long that I can no longer decode them from memory. Lately I’ve needed to read some resistor color codes occasionally so I found this chart online. I thought it was very easy to read and have it hanging on the wall in my lab for quick reference. I don’t remember where I found it and I’ve seen it in several locations so I don’t know who to credit but I wanted to repost it here for everyone to make use of.

Continue reading How to Read a Resistor Color Code