Electronics

Steering of the Daleks

May 4, 2009

I’ve been battling (for quite a while) with the steering controller for the full sized Dalek. I was shown these neat servo gearboxes from ServoCity.com. So I went ahead and ordered one for the HiTec 7955 servo. The modifications to the servo were really very difficult to do, and I hope I never have to […]

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Gated oscillator with 4093 chip

April 5, 2009

I recently came across a bunch of 4093 chips: These are Quad NAND gates, with Schmitt trigger inputs. It turns out you can use these to make oscillators and monostables – just like the 555, but more compact with less parts. So I updated the oscillator application I wrote to calculate out values using this […]

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Musical Tesla Coils…

March 30, 2009

…and I guess I use that term lightly. I’ve been building a MIDI modulator for the DRSSTC tesla coil I put together last year. One of the problems is tuning a 555 based oscillater to match MIDI note numbers. I played around with Excel for a while, but couldn’t really get anything useful going. So […]

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“Vintage” variac casing

March 29, 2009

I’ve been going through all my shelves in the basement and trying to complete as many of the unfinished projects as I can, just to clear some space. One of the things I needed to do was box up the old Staco Autotransformer I have. I was faced with this: But luckily I found Tim […]

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555 timer as a VCO

March 23, 2009

Taking a break from robots and lasers to work on my MIDI to DRSSTC Tesla coil adapter. (?) How cool is the 555 timer? I just discovered that by modulating the control pin (5) with a varying voltage you can alter the output frequency. Effectively a VCO – wow. (Do I sound like a geek […]

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Flatpack K9 – robots by mail

March 20, 2009

I just received the K9 flatpack kit. Some of you know that a couple of years ago I started building a K9 (I thought it better to start with something small and angular before tackling a big curvy monster like the Dalek). I started strong, but things soon got out of hand, and my (then) […]

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Arduino Shield for Laser Harp 2.0

March 19, 2009

I just got the first prototype PCB back from BatchPCB – there were a couple of errors (on my part) but the board is really well made and seems to work OK. I need to correct the silk screen layer and update the wiring for a couple of things. I might add some test points […]

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New laser harp almost done…

March 7, 2009

Some of you have been following my rebuild diary on the laser harp… Well that’s got the hardware pretty much complete – now the difficult task of rewriting the firmware to support all the new features. But first, it’s time for a cup of tea…

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New Laser Harp for 2009

March 4, 2009

I’ve been working away on a new version of the laser harp for 2009. The old one broke down after heavy gigging so I thought it was time to rebuild it, (we have the technology), to be better, stronger, faster than before… Built out of an old black box flight recorder – so quite a […]

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Pixart/Wiimote sensor library for Arduino

March 1, 2009

I just finished the first pass of the C++ object library for accessing the WiiMote/Pixart sensor from an Arduino. A simple example included with the library. (With a quick appearance by my daughter…) You do need to desolder the sensor and hook up a control circuit for I2C before you can use it. Like this. […]

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