Joule Thief Core Ratio & Variable Frequency Experiment

Simple DIY setup to allows testing of joule thief designs for efficiency, current, voltage, frequency, etc. OTHER JOULE THIEF VIDEOS How To Make A Joule Thief - Step by Step https://youtu.be/IV3lArO0_0U Tunable Joule Thief: https://www.youtube.com/watch?v=vli5LIGNlqM Joule Thief Experiment - Light Switch https://www.youtube.com/watch?v=L0qZ2ttEe4Q Joule Thief, No Toroid Coil https://www.youtube.com/watch?v=g2jMrNFV4nQ Winding a Toroid https://www.youtube.com/watch?v=_wvFv4YVYU0 A Mechanical Joule Thief - Is It Possible? https://www.youtube.com/watch?v=mGvoHc7rFww Joule Thief PLUS Crystal Radio Equals ??? https://www.youtube.com/watch?v=xn7U16j7IsU