I have never measured the distortion, but I do try to
keep the maximum voltage swing down to a tenth of the
supply voltage. The CMOS logic will operate all the
way from 5 to 15 volts or so, and at the higher supply
voltages you can have more audio voltage swing.
I don't notice any distortion by listening to the
output by ear. The CMOS gates have quite a bit of
gain and are operated with quite a bit of feedback, so
this helps keep the output linear. They operate
pretty much like a single supply op-amp but the nice
thing is the built in audio gate using the other input
to control audio through the portion of the gate with
the feedback resistor.
73 - Jim W5ZIT
--- [EMAIL PROTECTED] wrote:
> At 11/23/2007 03:12, you wrote:
>
> >Kevin, here is a circuit that I have used several
> >times to combine a control receiver with the main
> >receiver in a repeater controller. It can be used
> to
> >provide a second frequency port to a repeater
> system
> >with one port having precidence over the other, ie
> >when one port has a signal, the other port is
> >inhibited.
>
> How much distortion do you get using those 4011 NAND
> gates as audio amps?
>
> Bob NO6B
>
>
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