Saturday, 26 February 2011
Wednesday, 23 February 2011
555 Contest Entry
Background.I was excited when the 555 contest was announced to recognize the most used Integrated Circuit ever.
After considering for a while what I could do for the competition, I started thinking about how best to celebrate the 40 years that the device has been around and the 10s of billions produced.
I have often admired home built computers that use discrete components so I though, I will make a 555!
This 555 project recreates an operational 555 timer using discrete transistors, resistors, diodes and capacitors.
It may not strictly conform to the competition rules, but I thought it would be fun and original anyway.
Initial Research.
I downloaded a few 555 datasheets from various manufactures only to find that the circuits often have subtle differences. Eventually after some Googling I located a scanned copy of the original Signetics datasheet from dapj Circuits, Including the Equivalent Circuit below.
After inspecting the circuit, I noticed Q19 is rather unusual and has 2 collectors. How can I implement this using discrete components? I decided to simulate the circuit using the brilliant and free Java app from falstad.com to make sure it worked and to quickly experiment with different arrangements for Q19.
Arranging the resistor on the base of Q19 as in the simulation works perfectly. If I used 2 transistors to replicate the original Q19 design, the circuit did not oscillate.
Construction
In order to simply construct the circuit to show its operation and at the same time preserve the original authenticity, I photocopied and enlarged the Philips schematic, glued it to some card and inserted the components through the card and used point to point wiring on the rear of the card.
Component side of card.
A pin was used to poke holes in the card to insert the components. This was a surprisingly quick method of building the circuit. For prototypes of simple circuits I may use this technique again.
the only thing I might do differently is to paste a reverse image of the circuit onto the wiring side of the card in order to avoid wiring errors.
Testing
In order to test it works, I attached an LED to the output and suitable timing components, Ra, Rb and C to give an approximate 1Hz flash rate.
the final testing can be seen in the this video.
Making it presentable
The final thing to do is to make the project presentable. I decided the inside of an old data book would be appropriate. I found a copy of a suitable book on the 'free' table of my local ham radio club, the Manly Warringah Radio Society.
The final thing to do is to make the project presentable. I decided the inside of an old data book would be appropriate. I found a copy of a suitable book on the 'free' table of my local ham radio club, the Manly Warringah Radio Society.
This was the first time I have used a book as an enclosure. It works well if you are not in a hurry, which I wasn't. I followed the guide by Bre Pettis from Make Magazine. (Cool guy who I had the pleasure of meeting at a Maker Faire in Austin, Tx.)
One half of the book was cut to accommodate the circuit, while the other half was to house a battery, the 555 timer data sheet and memorabilia.
Right hand side of book contains the circuit
The left hand side of the book contains A5 printed copies of the Philips data sheet, The 555 Timer Wikipedia page and finally an interview with the 555 inventor Hans R. Camenzind.
The finished project closes nicely into the book for safe keeping.Finished project in operation
Saturday, 19 February 2011
Friday, 11 February 2011
WWF - Living Planet Report 2010
WWF - Living Planet Report 2010
The report, a leading statement of the planet's health, found that people are spending beyond the Earth's ecological means and dipping far into the Earth's natural capital. The ecological deficit caused by consumption of energy, water and materials at rates 50 per cent beyond supply will have serious repercussions for wildlife and ecosystems, as well as for future generations of people, all of whom depend on nature's ecological services.
Australia is #8 and New Zealand has the 32nd most heaviest footprint.
The report, a leading statement of the planet's health, found that people are spending beyond the Earth's ecological means and dipping far into the Earth's natural capital. The ecological deficit caused by consumption of energy, water and materials at rates 50 per cent beyond supply will have serious repercussions for wildlife and ecosystems, as well as for future generations of people, all of whom depend on nature's ecological services.
Australia is #8 and New Zealand has the 32nd most heaviest footprint.
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