> -----Original Message-----
> From: Jinx [SMTP:joecolquitt@CLEAR.NET.NZ]
> Sent: Friday, January 05, 2001 12:32 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE] : amplifier using hex inverter ??
>
> > have anybody heard anything about amplifier circuit using hex
> > inverter chip and other discrete ? where can i find more info ?
> > thanks in advance
>
> You need to use a feedback resistor (from output to input) of a
> meg or two, to get the inverter into its linear region. They can be
> quite sensitive and a bit "twitchy"
>
Performance is definately not in the upper class of amplifier design, and my
experience with these designs has been the same as Jinx's.  Sometimes they
work fine, sometimes not.  ISTR you had to use the unbuffered gates if you
are using the 4000 series.  The buffered ones never worked well.  With LM324
type op-amps costing pennies, I don't really see the need to use logic gates
other than out of curiosity.

Mike

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body