An external defibrillator routinely goes up to 360 joules. The original defibrillators used a damped sinusoidal wave form generated by a capacitor charged to a known voltage then discharged through an inductor across the chest. The impedance across the chest is close to 50 ohms.
For a routine 200 joule shock to terminate atrial fibrillation, the peak voltage is about 2200 V, the peak current is about 50 A and it's all over in about 5 mSec. At 360 joules, it's close to 3000 VDC and 70 A. Modern internal, implantable defibrillators use a 'biphasic' wave form and typically are designed to deliver a maximum of 35 joules which equates to about 750 VDC. Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of J. Forster Sent: Monday, November 28, 2011 10:28 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to batteries > Hey, John, got any idea of the DC to DC converter that charged that > capacitor? 1 transistor, 1 transformer. The photoflash cap is 80uF 330 VDC. > What voltage did it put out? I presume 250-300 VDC. If you really want to know I can measure it. > Or the time it took to charge it? Maybe 2-5 seconds. E = 1/2 C [uF] * V [KV} * V [KV] The energy stored is 1/2* 80 * 0.25 *0.25 = 2.5 J @ 250 VDC An external medical defibrillator is roughly 40 to 120 J. -John ============= > Guarantee that you won't light a flash tube with 1.5 VDC. > > Move on. > > Bill Hawkins > > > -----Original Message----- > From: J. Forster > Sent: Monday, November 28, 2011 9:43 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Line Voltage frequency Interface morphed to > batteries > > Recently, I took an old disposable 35mm film camera appart. It had a > flash, powered by a 1.5 V carbon-zinc AA battery. Inadvertantly, I got > across the terminals of the flash capacitor and got a hell of a shock. > > Had the current gone through the right (wrong?) place, I could well be > dead. > > -John > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
