Update 2020: Code is finally finished. This project was put on back burner for years but now with the Stay-at-home Covid-19 thing, I finall...

Since Canon EF-S (S for Small image circle) are the main lenses used with APS-C format cameras, I was wondering what is their quality. There...

In the early 80s, I built my first digital clock using exclusively TTL ICs. I had a crystal oscillator driven by 7400 NAND, a cascaded frequ...

Dew has always been a problem during telescope observation, especially so in the summer. The front lens of the telescope cools down rapidly ...

There are endless articles on Newtonian telescope collimation all over the Internet. A recurring theme is that plain laser collimation is no...

Here is one quick tip for the RC Cars crowd. I don't like "eyeballing" things that can be easily measured. For example, the t...

My 3 year old son tends to over-steer and over-throttle his E-Revo (he has somewhat fuzzy understanding of the word "gentle" :) so...

My son really wanted his RC car to have lights "just like on the real cars". The Spektrum SR3300T receiver is a 3 channel receive...

Installing a second steering servo on the Traxxas Mini Revo (1/16) VXL is an easy and fairly inexpensive upgrade (about $30 in parts). The E...

One disadvantage of the DFC (Direct Flight Control) Rotor Head is that it puts the blade grip control links under a lot of strain and they e...

Here is a tip for the RC heli crowd on how to repair or extend the antennas of the popular AR7200BX flybarless controller. AR7200BX is pret...