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using analog circuit to create a constant signal from a pulse.. — Parallax Forums

using analog circuit to create a constant signal from a pulse..

ArchiverArchiver Posts: 46,084
edited 2003-06-30 17:15 in General Discussion
i have a pulsing signal (a horn that goes beep-beep-beep). it pulses
at 12V. i have a siren which i want to connect to it which requires
a constant 12V. right now as it is hooked up, the siren simply
pulses along with the horn. is there anyway (i'm thinking with
capacitors) to give myself a 12V constant?

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-06-30 17:15
    I have done something simular before with a 5V pulsing signal. I used
    a 74HC123. It is a dual oneshot. Just set your RC values for the
    oneshot so that it will give you a constant output as long as it is
    being triggered by the pulses. Once the pulses stop the oneshot will
    stay high for as long as what you set the time constant to be by the
    RC values you selected.

    Jason


    --- In basicstamps@yahoogroups.com, "Rfan622" <rfan@j...> wrote:
    > i have a pulsing signal (a horn that goes beep-beep-beep). it
    pulses
    > at 12V. i have a siren which i want to connect to it which
    requires
    > a constant 12V. right now as it is hooked up, the siren simply
    > pulses along with the horn. is there anyway (i'm thinking with
    > capacitors) to give myself a 12V constant?
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