| Created by |
|
| Created | September 04, 2012 |
| Last modified | September 04, 2012 |
| Tags | joule-thief timed-light timer |
A simple single coil Joule Thief with a timer function.
A single coil Joule Thief light with a built-in timer.
Pressing SW1 will start the timing cycle which is approximately 40 seconds x Cx (uF). D1 and C2 steal some of the output to improve efficiency and to act as a capacitance multiplier to keep Cx small. With the values shown the delay is 3.5 minutes.
Brightness can be further improved by substituting a BC337 and BC327 for the NPN and PNP transistors.
No comments yet. Be the first!
Please sign in or create an account to comment.
Only the circuit's creator can access stored revision history.
