Questions tagged [joule-thief]
voltage boosting circuit.
61
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How to light up a rocker switch powered by a battery of only 1.5v?
I have a small hobby project for which I wired 4 AA batteries in parallel to achieve the desired result, which comes to 1.5V, as the batteries are in parallel, which is what works for my project.
My ...
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Joule thief circuit [closed]
I wonder why LED1 is turned on in the Joule Thief circuit and wirelessly connected LED2 is not.
Someone said "In Joule thief circuit the transformer is wound around a ferrite core. This is to ...
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Please offer comments, critique on self-resonating invented buck joule thief converter for third world use [closed]
Even though I'm not an EE, I have simulated the Joule Thief to death in LTSpice, but I have not yet made a prototype of this circuit. I have a friend who is an EE who won a contract to light some ...
- 2,892
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How do I produce more even output with a 6V Joule Thief?
For my 6V Joule Thief, it starts out too bright, and gets too dim towards the end of its battery life (about 3V). How can I improve this?
- 2,892
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How to reduce NPN reverse base current on this interesting "Super Efficient Joule Thief"?
Note: The question part is the fixing of the negative current at the transistor base. It looks like there's a problem with negative current at the LED(s) -- this is not expected to be answered in this ...
- 2,892
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3
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How can I measure the output of a voltage booster circuit?
I made this circuit, which was described on-line as a "transformerless Joule Thief." I was able to light four LEDs of varying forward-voltage in series, but I couldn't figure out how to use ...
- 709
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Is a balancing diode really necessary for the Balanced Boost converter?
Please pardon all of the information that precedes the question -- I didn't want you to actually have to go read the paper itself. This question is in two parts, but they are really equivalent, so it'...
- 2,892
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Is this video fake? I thought Tesla coils only worked on AC
This video shows a 9-volt battery connected to a wire as a primary.
The first reason I think this is fake is that he is powering a Tesla coil with 10 volts.
The second reason is that Tesla coils work ...
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How to design a boost converter? (1.5V to 4V)
I want to build a circuit that powers 2 standard red LEDs (forward voltage of 2V each) from 1 AA battery. I would like to learn how to design and build a boost converter that can take 1.5V in and ...
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How to use YX8122 led driver?
I am building a small LED lamp from a jar(about 100ml), so all components should fit in it. I decided to use a LED drive/Joule Thief, that I found at online Chinese store.
Datasheets (all I can find ...
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Using a Peltier element to power an Arduino
I got myself a Peltier element and want to use it for an IOT project.
What is the best way to use the Peltier in order to power an Arduino or something similar every few minutes? (For my project it ...
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4
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Can I charge a super capacitor with a MPPT?
I already did some testing.
I have a 220mW solar panel that charges a 3V supercap (takes a long time) which eventually powers my wifi module that needs ~1.5W (1.5 J/s) for 1 second then ~90mW (0.09 J/...
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Relaxation Oscillator LED Flashlight
I'm trying to understand the circuit presented in this video: https://youtu.be/qfgX93o8HzY?t=229
We states that when the power is first turned on, the left-most transistor has 0v at it's base so it is ...
- 307
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Low voltage (self-oscillating) boost for solar powered pond pump
Long story shortened:
I am currently designing a small filter for my pond using a small pump
(6V-12V, upto 540mA) with UV-C LEDs parallel to it. Currently, it is battery powered (9V, 6x1.5V AA cells) ...
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Simple self-oscillating flyback converter
I am studying switching power supplies, starting from the simple ones. I've just concluded looking at the joule thief and the blocking oscillator, and now I am progressing to self-oscillating flyback ...
