Hi. I am poking around with the Joule Thief concept. I want to 'capture' a voltage spike from a coil. Rather than pull it to ground, I want to clip the top at a voltage of 100V and use it to charge a capacitor. The lower part of the spike I want to let pass through. Is such a thing possible? I am not sure, being a mech guy. Thanks...........dd

 

Probably not with the Joule thief circuit, but there are circuits that could.

 

Hi. I am poking around with the Joule Thief concept. I want to 'capture' a voltage spike from a coil. Rather than pull it to ground, I want to clip the top at a voltage of 100V and use it to charge a capacitor. The lower part of the spike I want to let pass through. Is such a thing possible? I am not sure, being a mech guy. Thanks...........dd

What problem or function do you think that will solve?

https://en.wikipedia.org/wiki/Clipper_(electronics)
https://en.wikipedia.org/wiki/Clamper_(electronics)

 

What problem or function do you think that will solve?

https://en.wikipedia.org/wiki/Clipper_(electronics)
https://en.wikipedia.org/wiki/Clamper_(electronics)

yes, that is it, Negatively biased diode clipper. thanks, you electrical guys are boss.
one problem, it needs a battery.

to answer your question, i want the circuit to power itself.

 

Probably not with the Joule thief circuit, but there are circuits that could.

ok, what are they called, or what do they look like? maybe i can get some ideas.

 

yes, that is it, Negatively biased diode clipper. thanks, you electrical guys are boss.
one problem, it needs a battery.

to answer your question, i want the circuit to power itself.

It is not possible for a circuit to power itself. In fact, unity gain is a prohibited topic here—not because it is dangerous but because it is a waste of time and tends to cause arguments.

[MODERATION]

 

It is not possible for a circuit to power itself. In fact, unity gain is a prohibited topic here—not because it is dangerous but because it is a waste of time and tends to cause arguments.

[MODERATION]

ooookay...