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OT - Circuit Help (CORRECTION) — Parallax Forums

OT - Circuit Help (CORRECTION)

ArchiverArchiver Posts: 46,084
edited 2004-01-10 18:08 in General Discussion
Oops. I didn't even get the problem right. Sorry.

I need to hold the input to ground and LIFT it at the duty cycle of the
trigger and the max frequency is 1.5 kHz.

Thanks again.

---

Jeff Abrams
jeff@m...



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Original Message
From: Jeff Abrams [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=GmF58bHwSznECffLcCnMU_9oiF0cJHGxOl40dq953BpcAOwLL6nBI-BCOI3MU859-WN9SXIxV2vjjo3a9FU]clavier@b...[/url
Sent: Saturday, January 10, 2004 12:33 PM
To: Basicstamps@Yahoogroups. Com
Subject: [noparse][[/noparse]basicstamps] OT - Circuit Help


I know I've only been good at asking OT electronics help, but you people are
all such a fountain of knowledge it is hard to resist! (°;
Sorry I'm so ignorant.


I need to take a pulse (1ms - 3ms width, 500Hz max, 1.5v to 3v) and use it
to drive an input low (that is held high at 12v) at the same duty cycle with
as little lag as possible.
I would like to do this with as few components as possible (like a single
transistor if possible) as this is an automotive application and needs to be
robust and compact.
Help?

TiA!

---

Jeff Abrams
jeff@m...

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2004-01-10 17:48
    Is this correct? You have a pulse, when the pulse is low, you want the "12
    volt" device held at ground, and visa versa? Is the device a solenoid? Also,
    for the 12 volt device that will be held to ground, how much current does it
    use?

    Ken


    In a message dated 1/10/2004 9:43:50 AM Pacific Standard Time,
    clavier@b... writes:
    Oops. I didn't even get the problem right. Sorry.

    I need to hold the input to ground and LIFT it at the duty cycle of the
    trigger and the max frequency is 1.5 kHz.

    Thanks again.


    [noparse][[/noparse]Non-text portions of this message have been removed]
  • ArchiverArchiver Posts: 46,084
    edited 2004-01-10 18:08
    Oh, one more qualification.
    Rather than have the output be a simple "mirror" of the input, is there a
    way for the low output to be pulled high on the trailing edge of the input
    pulse?

    ---

    Jeff Abrams
    jeff@m...




    Original Message
    From: smartdim@a... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=iVfQdHFlbhgBdSyfM5dllflrgzbpQ0MKGMhQslaw8z8i6wmVhoYspRcc1s5bObUvosqbojpLL17EauE]smartdim@a...[/url
    Sent: Saturday, January 10, 2004 12:49 PM
    To: basicstamps@yahoogroups.com
    Subject: Re: [noparse][[/noparse]basicstamps] OT - Circuit Help (CORRECTION)


    Is this correct? You have a pulse, when the pulse is low, you want the "12
    volt" device held at ground, and visa versa? Is the device a solenoid?
    Also,
    for the 12 volt device that will be held to ground, how much current does it
    use?

    Ken


    In a message dated 1/10/2004 9:43:50 AM Pacific Standard Time,
    clavier@b... writes:
    Oops. I didn't even get the problem right. Sorry.

    I need to hold the input to ground and LIFT it at the duty cycle of the
    trigger and the max frequency is 1.5 kHz.

    Thanks again.
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