Re: Is there a dual equivalent to the quad LP324?

Hello Allan,


(To add to NT's list of applications) I saw a 4069 used as a four
channel matched voltage controlled variable resistor in a tunable
filter.
One of the remaining inverters was in the feedback path of an opamp to
linearise the control voltage - resistance characteristic.


Sweet. Do you remember where you saw that? If public domain it sure would help in convincing engineers and others that this isn't voodoo. I can't show other client's schematics for obvious reasons.

Klaus, there is an unbuffered inverter on the 74 series: 74HCU04. Also a buffered one for more gain, the 74HC04. Then there is the open drain variety 74HC05 which can have other interesting semi-analog uses. What is quite sad is that the venerable CD4007 did not find its way into the 74HC world. I guess there weren't enough engineers who used it.

Just a word of caution. The 74HC series is much more 'snappy' than the CD series. Their devices are stronger, meaning they can draw large currents when mid-biased and run at the higher end of their supply voltage range, possibly too much.

Regards, Joerg

http://www.analogconsultants.com
.

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