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Boostrapping Lights and Sensors
Log from Bullet Movies
So, part of this project will involve creating very fast light pulses (the photo-flashes), and part will be detecting fast optical pulses (the milk drop and bullet detecting photo-gates). The two, of course, are related in that a fast optical pulse generator...

My own try at a RingO9 with 2N2369A
Log from Hackaday TTLers
Edit: See also More 2369, with more caps !With a sporadic and limited access to the workshop (at last !) I can finally try new ideas ! I have meanwhile received 9K PMBT2369 in SMD but I decided to use the old stock of 50pc 2N2369A in metal can, that...

More adapter progress
Log from Vacuum System for Deposition
I got a piece of aluminum from a friend for the next part of the adapter, this was an lid from an old plasma etcher. Its a piece aluminum about 14x14 and 1.25" thick. Pretty perfect.I decided to leave it square, no reason to make it circular in the greater...

A bit of regulator progress
Log from Bench power supply
After 5 hours of torturing wolfram alpha with equations (that once I worked out, I could have just done myself), I managed to design a voltage divider for the feedback that will take the output signal to the same voltage range as the DAC outputs. this...

Start of pcb wrapup
Log from Bench power supply
I'm back on the project, slight distraction as I finished the digital wall clock I started 19 years ago.I have been busy gathering up the schematics and re-glueing and testing them. things have come togethor enough for me to start building one of the...

2014-03-14
Log from BasWheel, BasTire and BasHub
BasWheel v 1.25, 14 Mar 2014 : Added spoke_type "dxf" and parameter dxf_filename.Soon to follow a how-to tutorial for the spokes dxf generation.

Code
Log from Engagement ring GPS box
//GPS#include #include //LCD#include //Inclui a biblioteca do LCD //Servo#include //Defines#define GPS_TX 2#define GPS_RX 3#define LCD1 13#define LCD2 12#define LCD3 11#define LCD4 10#define LCD5 9#define LCD6 8//#define LUZ_FUNDO 6#define MOTORPIN 6#define...

Inital Designs
Log from Raptor12 Wireless AC Dimmer
Specs and inital designs.Its wireless--NRF 2.4ghzCheap -No transfomer-optio isolators-driver chips.Expandable -4/8/12 channel. -Add 2 expansion boards 4 channels at a time.Low power -20-30ma @ 5v consumption.Small Form factor-Enclose in a cheap 2inch...

Propeller Progress
Log from Goliath - A Gas Powered Quadcopter
Lately I've been spending most of my time outside of my day job working on the propellers. The picture above shows the current progress of the 4 propellers for Goliath. From left to right, there is the foam core with the birch plywood stiffeners...

Piezo discs
Log from Stupidly Cheap Electronic Piano
After long long search, I finally found 20 piezo disc ont fasttech for $1.25. You get 5 of them for that price, shipping included :)

DC-DC Step-Up Converter
Log from Digital Stamp with Inkjet Printing
I will need 20V for one of the ink cartridges (HP C6602A). So I need to step up my voltage from 12V to 20V. Here I use a step-up dc-dc converter around MC34063 (from UTC in this case).Multiple datasheets for MC34063 are available, e.g.:http://www.onsemi.com/pub/Collateral/MC34063A-D.PDFhttp://www.ti.com/lit/ds/symlink/mc33063a.pdfEven...

Added a touch probe
Log from Grizzly G0704 CNC Conversion
I wanted to add a touch probe, the guys who sell the flashcut cnc sell one, but they apparently don't want you to buy it, after a week of being ignored, i found one (probably cheaper) on ebay. http://www.ebay.com/itm/171403160255 "CNC Touch...

and the reversal begins, also switching to a belt drive.
Log from Grizzly G0704 CNC Conversion
Saturday we started measuring the XY backlash after last weeks tear drop circle, and wow 0.05" and .003" ! the Chinese Factory says 0.008 to 0.003" which ain't great but its a ways away from where we are.The Y setup on the G0704 is not great, its held...

One Step Forward, Two Steps Back
Log from RTL-SDR With Upconverter and Case
It's funny how no matter how much effort you put into doing something carefully, you will always end up being surprised by how badly it can go wrong.I decided that I should remove the new power supply circuit that I had added to the Junkbox SDR when...

Getting on with MC34063
Log from MC34063 based Bench power supply
Even though i thought of a different way to control the chip involving a digital Potentiometer ( going to prototype later), I found that that you can control the chip by feeding the feed back pin directly.The set up follows the provided buck schematic...

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