nuetron 64 Posted December 3, 2011 Share Posted December 3, 2011 Most of the info is in the link: http://www.falstad.com/circuit/#%24+1+5 ... -5+4+-1%0A It works in the simulator, but will it work in practice? I've had NE555 timers operate down to 2.5v before. :think: In several simulations without the zener-regulator, the output voltage went up to ~85volts in under 0.5 seconds. I know THAT won't hold up in reality, the 555 would fry long before then... :problem: Just an idea that spawned and wandered through my brain today. What do you guys think? Quote Link to post Share on other sites
oPossum 1,083 Posted December 3, 2011 Share Posted December 3, 2011 You fooled the simulator. Circuit will not work. Think about what happens when the 555 connects Vin to out. Quote Link to post Share on other sites
nuetron 64 Posted December 3, 2011 Author Share Posted December 3, 2011 I realize it would be going in a loop, which wouldn't work. How about this then? http://www.falstad.com/circuit/#%24+1+5 ... -5+4+-1%0A Quote Link to post Share on other sites
oPossum 1,083 Posted December 3, 2011 Share Posted December 3, 2011 There are better ways... Quote Link to post Share on other sites
nuetron 64 Posted December 3, 2011 Author Share Posted December 3, 2011 I know... That capacitor-diode setup is a quarter-wave Cockroft-Walton voltage multiplier. Full-wave works much better. Crashes the simulator, though. :cry: EDIT: You switched your pic before I replied! Quote Link to post Share on other sites
oPossum 1,083 Posted December 4, 2011 Share Posted December 4, 2011 The Dickson and Cockcroft-Walton multipliers can have many stages, but require a 2 phase clock. Using a 555 only provides one clock phase, so it is limited to doubling or inversion with one stage. You can't make a circuit that "eats it's own tail." It is possible to cascade doublers... nuetron 1 Quote Link to post Share on other sites
zeke 693 Posted December 4, 2011 Share Posted December 4, 2011 Could you use an astable multivibrator made from FET's or BJT's? Quote Link to post Share on other sites
nuetron 64 Posted December 7, 2011 Author Share Posted December 7, 2011 Like this? http://www.falstad.com/circuit/#%24+1+5 ... -4+0+-1%0A Quote Link to post Share on other sites
zeke 693 Posted December 7, 2011 Share Posted December 7, 2011 What are your target criteria? Quote Link to post Share on other sites
nuetron 64 Posted December 7, 2011 Author Share Posted December 7, 2011 Well, I didn't have any at first (exploring different ways of doing things, etc), but I have been researching voltage multiplication on/off for some time. I need a 12kv dc power source, that can supply about 10ma. I was hoping to leave inductors out of the equation also. Quote Link to post Share on other sites
oPossum 1,083 Posted December 7, 2011 Share Posted December 7, 2011 12,000 volts? Use a NST or a TV flyback without the tripler Quote Link to post Share on other sites
RobG 1,892 Posted December 7, 2011 Share Posted December 7, 2011 You can also try auto and gas heater ignition transformers. What are you building? MSP430 powered musical Tesla? nuetron 1 Quote Link to post Share on other sites
zeke 693 Posted December 7, 2011 Share Posted December 7, 2011 Well, I didn't have any at first (exploring different ways of doing things, etc), but I have been researching voltage multiplication on/off for some time. I need a 12kv dc power source, that can supply about 10ma. I was hoping to leave inductors out of the equation also. 12KV and no inductors? :!!!: You :crazy: One ignition coil + plus one astable multivibrator and you're there Man! Quote Link to post Share on other sites
gwdeveloper 275 Posted December 7, 2011 Share Posted December 7, 2011 Sounds like you need a neon sign power supply. The last one I took apart was 13KV and 35ma. Quote Link to post Share on other sites
nuetron 64 Posted December 7, 2011 Author Share Posted December 7, 2011 12KV and no inductors? :!!!:You :crazy: It doesn't HAVE to be without inductors, I was just hoping. The whole circuit needs to be lightweight (<2 lbs) too, and inductors (coil transformers) are often heavy. I had gotten about 3kv from an eight-stage full-wave CW multiplier, from about 12v dc, using a 555 to clock an H-bridge step motor driver. It just didn't provide very much current (it was in the microamp range). What are you building? MSP430 powered musical Tesla? Sorry, no. My brother is working on a project that uses high voltage (12kv he told me), and he asked me to build a supply for him... Months ago... :problem: (And I'm not allowed to say exactly what he's working on) I've been researching and digging, but I haven't hit the nail on the head yet. (The ground rod with the lightning? ) And so, I finally broke down and decided to ask here... Quote Link to post Share on other sites
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