To: | [email protected] |
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Subject: | LF: A divider with no power supply |
From: | Paul Nicholson <[email protected]> |
Date: | Wed, 02 Mar 2016 12:17:00 +0000 |
Reply-to: | [email protected] |
Sender: | [email protected] |
User-agent: | Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 |
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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