Add an LDR to your joule thief and enjoy a whole world of additional usefulness. From day/night functionality all the way up to a joule thief megaprocessor.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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Photonic Computer 😅
a toroid will give a longer pulse, same energy but at a lower overall potential as the magnetic field doesnt collapse so fast.
the straight ferrites, usually in SMPS supplies wrapped in a bit of heatshrink… they make really snappy pulses with high peaks, better for driving several LEDs in series.
theres also a spike back on teh base, can throw a LED there.
i tend to use my LED like a freewheel diode, across the coil.
this way it also works on higher voltages. LEDs dont mind being overdriven with pulses, they limit the current/voltage themselves when theres a restricted supply of power, such as in a pulse. they smoke when the power is continuous… or at least, over the duty cycle. so you cant run a higher voltage with the LED where it traditionally is.
Hello
How to make led
What is the highest amount of voltage you can put into a jule theif?
Is it possible to take the voltage output to the LED and use it to recharge another rechargeable battery? Given that the forward voltage is about 2.1-3.5V for the led at about .017-.030 A. ? So you could suck those alkaline cells dry and get a freshly charged Nimh or Nicad battery out of the pile of "dead" batteries.
I bet this recharged battery of 1.5V could then be plugged into another houle thief to electroplate small items with a brush and working electrolyte solution.
Also the Joule thief to charge a small battery could be ran from a small solar cell(s) even in dim light from indoors or cloudy days? Neat!
Am I right that the larger the LDR the more sensitive it is, and that is the only reason of the larger sizes? If I remember the 1980's when I played with some they had varying resistances but when I look around now all the Chinese ones are the same.
What's the value of inductor ?
I loved your thoughts on logic gates; and as always your whole video.
Could do with a joule thief in my Roberts DAB radio, takes 6 D cells and gets distorted when the voltage drops
Linus Tech Tips, did a video on the Apollo computer, including close up shots of the computer cores of the guidance system, which showed the ferrite wound matrix. There was another YouTuber with him (cannot recall who), they even got to talk extensively to one of the original engineers who worked on the system.
What if you replace the transistor with a blinking led that uses avalanche breakdown to blink?