Re: biasing 74HC14 input to 1/2 VCC for small signals

On Sat, 20 Dec 2008 16:15:02 -0800, Joerg
<notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:

Jim Thompson wrote:
[snip]

Test question, what does this do...

C
V2-----SW1----+--||---+--74HCU04----+----OUT
| | |
V1-----SW3----+ +----SW2------+

SWx are analog switches.


It oscillateth :-)

It doth not ;-)

Note that it's 74HCU04... do you know what that means?


But only if V1 and V2 are sufficiently low impedance.

(1) What does that have to do with it?

(2) Part of the "test" is to define when each switch is open/closed

Now! What does it do?

This will indeed separate the men from the boys, the designers from
the hackers, those that understand electronics and those who can only
make LED's blink ;-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona 85048 Skype: Contacts Only | |
| Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
| E-mail Icon at http://www.analog-innovations.com | 1962 |

I love to cook with wine Sometimes I even put it in the food
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