To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : ) help us to bring you our services at . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Google Search

Custom Search

Author Topic: Joule Thief Powers Battery Electric Clock  (Read 5293 times)

Offline chemist6146

  • Newbie
  • *
  • Posts: 2
Joule Thief Powers Battery Electric Clock
« on: September 17, 2014, 01:01:59 PM »

I hope that this qualifies as a new topic.

I have just posted a video to YouTube:


I have attached the circuit. This shows how I modified a Joule Thief circuit to charge a bucket capacitor (1000uF) to a controlled voltage in the range 1 to 1.5 Volts which enabled a very low battery to power a typical battery electric clock.  In this example it was found possible to power the clock with a battery showing 0.7 Volt with a current of a couple of milliAmps.  I am not claiming that the circuitry is optimum and the number of turns on the toroid could be experimented with.

All of the components were obtained from my local Maplin store, (a chain in the UK,) but none are in any way critical.

I think that this could extend the application of the Joule Thief circuit to situations where an intermittent current is supplied from a bucket capacitor.  I think that it may be possible for much larger capacitors to be used although a limited battery may take longer to charge them.

The clock application is almost perfect for this circuit and it may be possible to make a long lasting solid battery from cheap materials yielding the necessary 0.5 to 0.7 volts at a very few milliAmps which would run a clock for a very long time.

I would be delighted if another enthusiast could reproduce what I have done.