If you want a working filter design fast, Texas Instruments has the document for you.
http://focus.ti.com/lit/an/sloa093/sloa093.pdf
High pass, low pass, band pass, band reject. Circuits for dual and single supply designs too.
Monthly Archives: February 2011
Partfinder: Alternative to SparkFun’s Rotary Encoder
ladyada maintains a wiki page of parts called Partfinder, so I thought I might just use the name because I lack creativity. Hope she doesn’t mind.
I bought a couple of the rotary encoders that SparkFun carries through a local online store here called sgbotic.com for S$4.95 and I was wondering whether there were any other similar alternatives. I did a search on my favourite component distributor, now called element14, and it turns out there is a cheaper alternative! So I thought I’d share it here.
Lumix LX3 (Lacks a) Remote Shutter Release
It’s sad that my family members always buy stuff that lack features I want (or sometimes sane features – I’ll talk more about this in another post hopefully in a few weeks). Obviously if I had a say in it, I would definitely not have picked it.
My sister bought a Panasonic Lumix LX-3 some time ago, but unfortunately, it lacked a remote release feature. The previous camera, bought by my dad, was a Sony DSC-T1, and it too, lacked such a feature. Sigh. This means that I (still) can’t take timelapse photos easily.
Someone built a solution for the Lumix LX3 and it looks like this:
Maybe if I was really desperate, I might just build one.
Oscilloscope CRT disassembly and explanation
Here’s a nice video about how an oscilloscope (or generally a regular) cathode ray tube works.
irq5.io 