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'50vAC to 5V Pic'
1999\02\21@175811 by Karl A. Uscroft

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Help.  Has anyone any ideas.

I have to get a small circuit to take a 50 Volt ac pulse to power a small
16F84, and then use what power is left to drive an LED.

In other words a 50Volt AC in to a Flashing LED out using the 50V AC as the
power supply.  Have tried a small reg and large caps but this then starts to
drive back down the 50v line.  The 50v line in has to "sence nothing on the
other end" (the hard bit).


Thanx

1999\02\22@024119 by Gerhard Fiedler

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At 17:57 02/21/99 -0500, Karl A. Uscroft wrote:
>I have to get a small circuit to take a 50 Volt ac pulse to power a small
>16F84, and then use what power is left to drive an LED.
>
>In other words a 50Volt AC in to a Flashing LED out using the 50V AC as the
>power supply.  Have tried a small reg and large caps but this then starts to
>drive back down the 50v line.  The 50v line in has to "sence nothing on the
>other end" (the hard bit).

i'm not sure i understand what you mean, but if you take the current to
drive a pic and a led, the 50V ac line will "sense" exactly this current,
since it has to come from somewhere... you might be able to drive the pic
and the led from the same current and have them so to speak in series, but
you still need =some= current.

ge

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