This has been blogged, here and here. I added a CdS photocell (resistor with a circle around it) to shut it off during daylight, thus conserving the AAA cell. I used a 100k resistor for the base bias, so it draws very low current from the cell. I can then call this a low power
(Read More…)
I have often seen schematics of Joule Thief chargers for use in charging Ni-MH rechargeables from used alkaline cells. The idea is to boost the voltage of the used alkaline cell up to high enough to get current the flow into the Ni-MH cell. One setback is that conventional JTs are only 50% efficient, so
(Read More…)
The day after tomorrow is turkey day, and I have been trying to read some online things but I keep getting distracted. One article I found on Investopedia is about at&t, as its logo is now spelled, but was known as AT&T for more than a century. The article gives a bit of at&t’s history
(Read More…)
After the 2015-10-26 blog, I searched for some other websites selling small flashlights and ended up at dxsoul.com, which is a part of Deal Extreme, DX.com. I also found some reviews of other, cheaper flashlights, two of which were the Brinyte and the Tank007. On dx.com I found and ordered the the package called ‘Mini
(Read More…)
I have been into this kind of stuff for quite a while. You can search my blog for more on this. It’s difficult for even the strongest of bicyclists to put out 100 watts for a few minutes, let alone an hour. Assuming that a person could pedal a 100% efficient 50 watts for an
(Read More…)
