The 4093 is a quad 2 input schmitt trigger NAND gate that will work
in the same oscillator circuit as your HC14. Use the second input as
the gate to control the oscillator on/off.

On 8 Aug 2002 at 19:52, John Waters wrote:

> Hi all,
>
> I use one of the inverter in a 74HC14 (hex schmitt-trigger inverters)
> as an oscillator to drive a piezzo buzzer. Is there any way to turn on
> or off the oscillator by using a simple circuit, preferably built by
> using the rest of the unused inverter in the 74HC14, or some simple
> passive components? I don't want to add more chips, as simplicity is
> the key of this project!
>
> Thanks in advance!
>
> John
>
>
>
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Brent Brown, Electronic Design Solutions
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