Diode ring mixer
A picture says a 1000 words.. this is an ancient mixer on e-bay recently, I have one for experimentation. It…
How to get a desired resistance using standard resistor values
This is easier than expected… (example) type “how can I get 2869 ohms using standard resistors” in Wolfram Alpha and …
Programming the ATmega32U2
This is a low cost microcontroller, less than $5 in a qty of 1. ATmega ready-made boards are cheap, around…
Quad FET mixer
Saw this mixer here (google translation – the original website is in Japanese).It looks quite neat! The entire website has…
Transmission line transformers (TLT)
Worryingly, there are comments here: http://www.eham.net/articles/24502 that are simply wrong, and cause a lot of confusion to people trying to…
Writing and running Java programs in 5 minutes: Java error: package com does not exist
For quick development work, I’m not interested in using netbeans or eclipse or some other IDE, but the majority of…
Mixer circuits
Most modern mixer information these days concerns the Gilbert Cell active mixer, but these are alternative active mixers, snippets from…
More dielectric constants
Since these are so hard to find, I’m going to record all findings. According to a 1961 document called Plastic-Film-Dielectric…
Tablet cover part 3 (final part)
Edges were soaked with water, and sewed bit-by-bit, clipping it into place after sewing each little bit (lots of clips…
Tablet cover part 2
I decided on a book type cover, so the following shape was laser cut in leather. CAD file is…