On Thu, 8 Aug 2002, 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!

Use annything you want to drive the input of the schmitt gate that forms
the osciallator, through a diode, f.ex. a 1N4148, with a logic level.

Peter

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