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'[OT]: Any simple way to turn an oscillator ON/OFF?'
2002\08\08@225744 by John Waters

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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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2002\08\08@231849 by Rick C.

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I'd just ground the input, or, if you're disabling it from a logic level, pull
the input to ground via a diode.
Rick

John Waters wrote:

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2002\08\08@235117 by Jinx

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The 74C14 are single-input gates, so you can't use gate logic
to turn the oscillator on/off (I presume, as you've not described
the oscillator circuit). You could send the AC from the oscillator
through a resistor to another 74C14 gate and ground the input
of that 2nd gate with an NPN transistor (and so also ground the
AC via the resistor). That would give you "1" (sound off) "0" (sound
on) control at the transistor's base

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2002\08\09@004612 by Rick C.

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I can only assume that it's a simple oscillator with a feedback resistor
and a cap from the input to ground. Just using a diode on the input,
anode to input, and you can stall the oscillator by pulling the cathode
to ground (low) by a preceeding gate. I use such a circuit in a few cmos
projects now. Or, an npn collector to the input. Saturating the npn will
also stall the oscillator.
Rick

Jinx wrote:

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2002\08\09@005148 by Harold Hallikainen

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Put a diode between the oscillator schmitt input and the output of another section. If the cathode is connected to the new section, setting this output low (driving the input high), will force the oscillator input low, the output high, and not allow it to oscillate. I've done stuff similar to this to make an HC14 watchdog timer.

Harold




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2002\08\09@022138 by Brent Brown

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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:

{Quote hidden}

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2002\08\10@064524 by Peter L. Peres

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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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