 90 - 100v booster ideas
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klugesmith
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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
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GeordieBoy wrote ...
Just like a normal boost converter, but with the neon bulb connected directly across the boost switch. No boost diode or output smoothing capacitor required.
The inductor-transistor-neon detail looks a lot like a Joule Thief circuit, which typically runs a white LED from one nearly-dead AA cell down to 0.6 volts or less. So I thought about arranging a secondary winding on the inductor to make a self-oscillating circuit, with no more than an additional resistor or two and maybe a small capacitor (skip the 555!)
Turns out it's already been done, more than a few times -- just do a Google or YouTube search for joule thief neon. I'm sure we could contrive one that efficiently runs a NE2 lamp from 5V or 12V. Not that it's worth a lot of effort to save a few pennies with respect to no-brainer 555 solution.
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