EMF catch and dump

602

09:37:57

Back EMF from the blocking oscillator charges the capacitor. The voltage divider controls the two switch transistors to activate the Darlington pair. When the capacitor reaches +90V, the Darlington pair turns on, rapidly discharging the capacitor.

Circuit is useful for driving a high voltage solenoid from a low voltage source.

published 12 years ago

Igor

12 years ago

Amazing. Is there a name for this transformer based oscillator?

faceblast

12 years ago

It's similar to a "Joule Thief"; I've also seen it in some camera flash capacitor charger

justinmcg67

12 years ago

Brilliant.

hippodribble

11 years ago

Sample and hold on a Joule Thief. Looks like Vout is mainly controlled by the large cap. Peak power seems to be 6400W through the Darlington pair. It may explode every 10 milliseconds. Have you built one? Got a video?

lenzrulz

11 years ago

Nice

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