[time-nuts] Line Voltage frequency Interface morphed to batteries

[Bill Hawkins]

I should have been more direct.

What does a charged flash capacitor have to do with safety concerns
for low voltage batteries touching the tongue?

You can have the last word. It's time I moved on.

Bill Hawkins


-----Original Message-----
From: 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
>
>
>
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