Here’s a picture of one of my flashlights, taken on the last day of 2006. I most likely had this posted on my late great watsonseblog. Maybe even here, too.
I measured the voltage of an unused Energizer Lithium AA cell, and found that it was 1.806 VDC, and another one measured 1.807V. Wow! Looked like the Energizer Bunny was running on jet fuel! These are very potent batteries. Their voltage is 20 percent higher than the normal AA cell. These lithium cells are supposed
I was discussing using an incandescent lamp for a heater, where the amount of light is not important. I looked up some info on miniature lamps in the General Electric Miniature Lamp Catalog. Miniature lamps used to be inside of appliances, and cars, such as in the instrument panel, speedometer, glove box, etc. Now they
I started out using a single pole, single throw pushbutton switch from an old mouse for the switch on my Joule Thief with timeout circuit. But I changed it to a double throw switch. It’s simple to use the single throw switch to charge or discharge the timing capacitor and start the timeout. But if
I built this quite awhile ago, I didn’t put the date in the pic.
This was from June, 2003. I still hadn’t tried to experiment with the single transistor Joule Thief circuit to get it to be powerful enough to drive 3 LEDs. The circuit I used is found here.