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how many charges can i get with disposable camera circuit with a 2000uf cap?

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casey

Thu Oct 30 2008, 11:52PM

Registered Member #1787 Joined: Thu Oct 30 2008, 12:33AM
Location:
Posts: 13

i'm building a coilgun for school that must run off a 9v battery. will that battery even be able to fully charge the 2000uf cap? i'm using the standard disposable camera circuit at 300 and some odd volts.

Fraggle

Fri Oct 31 2008, 01:24AM

Registered Member #1526 Joined: Mon Jun 09 2008, 12:56AM
Location: UK
Posts: 216

Yeah easy, batteries hold loads of energy compared to capacitors.

Backyard Skunkworks

Fri Oct 31 2008, 01:43AM

Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451

Roughly 60 charge cycles assuming no inverter losses.

In reality you might get around 30-40.

Your cap is 108J, and a 9V battery holds roughly 6kJ.

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