Wednesday, July 24, 2013

New cement batteries.

I've made a group of new cement batteries last weekend in different sizes and with different chemicals added:
two large Red Bull can batteries(or to be precise : cells):
1.19 V with copper tube
1.27 V with copper strip
one Monster can battery
1.13 V
one energy drink can battery,Alum added:
1.15 V
four Coke batteries:
Magnesium sulfate added:
1.16 V
Borax added:
1.29 V
Alum added:
0.5 V
Copper sulfate added:
1.07 V

Saturday, July 13, 2013


I finally got my first set of Meccano,after looking at it for a long time and wondering what I would make with it.Now I can put my thoughts into practice.I found it all thrown together in a beat up old tin in an antique shop and paid 29 Euro's for it(about $38),a fair price I think.
I'm now making a box for it,which will have a list of all the numbered parts on it pasted on the lid.

Friday, July 05, 2013

Flashing Joule Thief

I have been looking for a Joule Thief circuit that works nicely with my cement batteries,and finally found one.It is called the Simplified Flashing Joule Thief ,and that is exactly what it does.
Here is the link to the page:Quantsuff's LED Page.
I will make a few of these circuits,with slight differences between them.The first one has a red LED and four capacitors with two on-off-on switches,so I can change the flashing rate.The next one will have a potentio meter.