Re: LF: A divider with no power supply

To:	[email protected]
Subject:	Re: LF: A divider with no power supply
From:	Andy Talbot <[email protected]>
Date:	Wed, 2 Mar 2016 12:22:41 +0000
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Yes, I had that once.

Surreal, isn't it ;-)

'jnt

On 2 March 2016 at 12:17, Paul Nicholson <[email protected]> wrote:

I just discovered something as I turned off the 12V supply to
the CD4040 I've been using to divide 477.69kHz by 16.

With the supply off - it still works - with a nice square
29855.625 Hz output!

It seems that the input to the divider, 477.69kHz sine at
4.5V peak biased at about 6V is passing through the input
protection diodes of the CD4040 and supplying the Vdd rail
quite sufficiently for the divider to operator. The rail
voltage is 7.76V and the output is a square with
amplitude 7.4V.

--
Paul Nicholson
--

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