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Just an idea

A project log for Badge Killer Shitty Add-On

No more blinking leds for you!

GerbenGerben 06/20/2019 at 19:175 Comments

For now this is just an idea for a Macrofab Contest entry. I'm not yet sure if I want to try making this.

High voltage scares me. And I don't even know how to generate it. This one is way out of my comfort zone.

If anyone has any idea, let me know.

Discussions

Tillo wrote 06/21/2019 at 11:48 point

Bunch of caps charging in parallel and discharge them in serial. Reverse polarity should do the rest. Since the SAO also has some GPIO pins and I2C connect them to the high voltage as well, just cause more havoc.

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Gerben wrote 06/21/2019 at 15:30 point

My plan what to go for the GPIO/I2C pins.
Trying to change the 3.3V line would be too hard, with all the capacitance on the badge, possible the battery absorbing some of the voltage, and all the leds already sucking a lot of juice, requiring a very high amperage pulse. And thus some huge capacitor(s).

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davedarko wrote 06/20/2019 at 21:28 point

I think the general idea is a voltage multiplier, so (capacitor+diode) * n and PWM? not 100% sure. 

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Gerben wrote 06/21/2019 at 15:44 point

I forgot about those. Not sure how to use PWM in those. The Dickson Charge pump can work, but can't generate that high a voltage. Or would at least require high voltage capacitors everywhere.
Then there is to problem of switching this high voltage. I don't think MOSFETs like 200V.
The more I look into this idea, the more problems I'm seeing.

Anyway; thanks for your suggestion.

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davedarko wrote 06/21/2019 at 20:02 point

I don't think you switch that on and off, you just turn on pwm as a crude replacement for the necessary AC and aim that on everything else? not sure how the usb killer do it, but that's something discussed and probably open / explained somewhere :)

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