I've added a small section of half inch scale to the file to allow you to validate that your printer is producing output of the correct size. This isolated voltage can be controlled by the pot R5; capacitor C1 is used to pass the pulses produced by L1 to the gate for switching. This effectively opens the collector-emitter path removing the current flow across the primary coil. To preserve battery life the best practice is to use a timer to prevent overcharging to continue past 13 to 15 hours. The tissue paper is placed over the can base, then a few drops of salt water solution are dripped onto it, as shown below. The power output from the cell varies over time. The ferrite ring transformer that I've used was salvaged from an old computer circuit.
The biggest drawback of a super capacitor in this situation is the low voltage operation. We first start with some extra extending out and wind 15 loops, then fold the remaining wire to be wound and leave some extra for the transistor base coil; now loop the folded wire 15 more times. I know stealing of ideas and designs is common practise these days. The circuit can utilize an input voltage down to about 0. I also switched which number of loops went to the collector and base of the transistor which is colored in red to show how bad it is to get the wiring wrong.
I found that most of the time, ~80%, I really hadn't manage to select two batteries with almost identical depletion levels. Everyone can use this circuit for his own projects but if used in any way for commercial products I would like to be included in the earnings! A closed-loop regulated joule thief When a more constant output voltage is desired, the joule thief can be given a closed-loop control. That indicator light will not come on until the cap is fully topped off. Simple Joule Thief: Transistor vs. Solder it to one side of the resistor. The Super Joule Thief can do just that! My first attempt was only about 10% efficient.
However, since the more windings the less current is used, perhaps more tests to see how low a current is possible with a reasonable number of windings would be worthwhile. The voltage at the output of the coil builds up until it reaches a voltage where is can go through the load and be dissipated. In my case, I'm going to remove the ferrite coil arrowed and nab a transistor. Two Batteries Tests I wanted to see how long two batteries measuring less than 0. We are a little skeptical about his capacitor theory and ended up to defog the issue of parallel and series capacitance. Core vs Current Tests 1. I believe that either the choice of transistor was incorrect on my first attempt, or I didn't have enough turns of wire on the transformer.
Much above or below that is out of the sweet spot. This patent was intended for use with. You don't have to do this, but it makes winding a little easier. I know stealing of ideas and designs is common practise these days. Now cut off the excess wire. The cell seems to be able to produce a steady 5mW, and has done so for 4 days.
You can find toroids in a few places. The electricity traveling through the second coil and through the transistor are now at a maximum. Hence, when it reaches a critical collector current, the base drive available becomes insufficient and the transistor starts to pinch off and the previously described positive feedback action occurs turning it hard off. I also used some Performix Plasti Dip comes in a one gallon can. The lowest current use is when the loops are in a ratio of 40 - 42%.
The joule thief is a fascinating and simple circuit that is able to produce a usable voltage from a low voltage source. If you view the images directly they will look a bit ragged at the edges. The zener diode and the capacitors help to limit these voltage spike. Take the other single wire from the toroid, and solder it to the collector of the transistor. The first step is to wind the toroid. I know stealing of ideas and designs is common practise these days.
The way you connect it changes the way the coils are electromagnetically coupled, changing the output. The second test I'll start with about half as many loops, 12, and I'll start with the base using 8 loops. The second configuration is smaller and fits in a bottle lid. As I come across more, I will add it to this page. Don't use anything other than plain cheap vanilla ferrite, since any other type will reduce efficiency. Registration Please confirm the information below before signing in.