Monday, July 8, 2013

Here are some Diy photos

http://99thingsyouwishyouknew.com/wp-content/uploads/2013/07/63f51_diy_5708553852_abee631cf4.jpg

A few nice diy images I found:


DIY video dolly stepper motor driver

some photos Here Here are some Diy photos



Image by Victor W.

Here’s the circuitry for the stepper motor driver for my DIY camera dolly.


All made from ‘junk’! some photos Here Here are some Diy photos


The ubiquitous 555 timer, (hooked up for variable mark/space ratio, if you build one you’ll find out why it’s needed), and a couple of D type flip-flops, (4013), to provide the count for the ULN2003 stepper motor driver. (ULN2003′s might be hard to find off the parts shelf nowadays, this one was stripped from an old printer board but a ULN2803 or similar will do a nice job).

The 4013 provides a 0011 and 0110 count required for the boot-strapped ULN2003, a DPDT switch providing forward and backward drive, (by simpling reversing the connections). The ULN2003 is hooked up in such a way as to provide dual coil drive for a unipolar stepper motor so that it gains more torque to drive the ‘dolly’.


A 7805 regulator to provide 5 volts for the 555 timer and flip flop, (the stability of the 555 timer is much improved by doing this!), and the 12 volt from the battery pack driving the stepper motor. The timing capacitors on the 555 are a tantulum, (1uF), and myler, (0.22uF), types to further aid stability.

Why concentrate on stability for a junk circuit? Well this can run really and I mean really slowly so little drift as possible seemed like a good idea.


Could it be better? Yes, definately. I was going to use a 4017 decade counter hooked up with diode logic to provide half step driving to the stepper motor with a further output to fire the camera when the rail is not moving, but the scrap 4017 counter I lifted from a scrap board had a faulty output so that idea was put to one side.


No micropchip PIC’s or Arduino’s here, but all pure junk and something quick to knock up over a weekend some photos Here Here are some Diy photos


Who knows, maybe I’ll get into this and put something more luxurious together. Or maybe not and I wouldn’t have wasted too much time and definitely no money. Nice.


A PCB layout? Sheesh, you must be joking. I’m such a miserable old so and so you were lucky I even bothered compiling a schematic!


DIY Horizontal iPod stand

some photos Here Here are some Diy photos



Image by kodomut

DIY Stand made from cardboard.


Write up @ kodomut.blogspot.com/2009/05/diy-ipod-horizontal-stand.html




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