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Any EE can help with simple circuit plan?

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  • Any EE can help with simple circuit plan?

    I need a circuit that will trip a relay momentarily, say 200-400ms, once after mains voltage (110V) is applied. I mean I switch the device on, and it will trip this relay once and that is all. I feel this is an elementary design question, but I'm no EE. Ideas?
    Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
    Sites: Jupiter Audioworks - Flicker Stream - Proud Member of Midwest Audio Club

  • #2
    There are adjustable time delay relays sold.
    ( Most time delay circuits I've used have a longer delay time - usually seconds not milliseconds ).

    http://www.bowdenshobbycircuits.info/page2.htm
    Delay time in theses circuits is set by a combination of Capacitor and resistor values to set a common emitter.
    "Not a Speaker Designer - Not even on the Internet"
    “Pride is your greatest enemy, humility is your greatest friend.”
    "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

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    • #3
      Originally posted by JasonP
      I need a circuit that will trip a relay momentarily, say 200-400ms, once after mains voltage (110V) is applied. I mean I switch the device on, and it will trip this relay once and that is all. I feel this is an elementary design question, but I'm no EE. Ideas?
      What exactly are you trying to accomplish ? Sent from my SCH-S968C using Tapatalk
      craigk

      " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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      • #4
        Originally posted by craigk View Post
        What exactly are you trying to accomplish ?
        That would speed things along to define the circuit requirements.

        "Not a Speaker Designer - Not even on the Internet"
        “Pride is your greatest enemy, humility is your greatest friend.”
        "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

        Comment


        • #5
          When I turn on the power to several boards, I also need to trip the power switch on a motherboard.
          Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
          Sites: Jupiter Audioworks - Flicker Stream - Proud Member of Midwest Audio Club

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          • #6
            Used a pair of DPDT relays in series for something like this once. First relay feeds the the coil of the second and "signal" goes through the NO of the first and NC contacts of the second. The second coil takes time to react but not sure how much. Enough in my case.

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            • #7
              Sounds like for $6 a ICM102 Delay-on-Make Timer with .03-10 minute adjustable delay, universal 18-240 VAC might* do it.
              * Load current?
              "Not a Speaker Designer - Not even on the Internet"
              “Pride is your greatest enemy, humility is your greatest friend.”
              "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

              Comment


              • #8
                Originally posted by JasonP View Post
                When I turn on the power to several boards, I also need to trip the power switch on a motherboard.
                Are you talking about a computer motherboard? Those use a momentary contact on the front panel header to send turn on signal to the power supply. That's an important distinction since most delay relays are intended to turn on and stay on.
                Electronics engineer, woofer enthusiast, and musician.
                Wogg Music
                Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus

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                • #9
                  Perhaps using Wake-On-LAN setting in BIOS?.

                  "Not a Speaker Designer - Not even on the Internet"
                  “Pride is your greatest enemy, humility is your greatest friend.”
                  "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

                  Comment


                  • #10
                    Originally posted by wogg View Post
                    Are you talking about a computer motherboard? Those use a momentary contact on the front panel header to send turn on signal to the power supply. That's an important distinction since most delay relays are intended to turn on and stay on.

                    Yes, which is why I need a momentary click from the relay setup.
                    Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
                    Sites: Jupiter Audioworks - Flicker Stream - Proud Member of Midwest Audio Club

                    Comment


                    • #11
                      Originally posted by Sydney View Post
                      Perhaps using Wake-On-LAN setting in BIOS?.
                      I considered the "restore to on" setting in BIOS to tell the board to start when power is connected but I worry what would happen if the bios was reset somehow and I wasn't the one using it to reconfigure the board.
                      Audio: Media PC -> Sabre ESS 9023 DAC -> Behringer EP2500 -> (insert speakers of the moment)
                      Sites: Jupiter Audioworks - Flicker Stream - Proud Member of Midwest Audio Club

                      Comment


                      • #12
                        A good old 555 timer one shot perhaps. You could drive a small SPST relay to hit the MB header. Sent from my SM-G920P using Tapatalk
                        Electronics engineer, woofer enthusiast, and musician.
                        Wogg Music
                        Published projects: PPA100 Bass Guitar Amp, ISO El-Cheapo Sub, Indy 8 2.1 powered sub, MicroSat, SuperNova Minimus

                        Comment


                        • #13
                          RE 555 circuits:
                          http://www.edn.com/design/analog/432...-interruptions
                          http://solorb.com/elect/bootcirc/PCautoboot/
                          "Not a Speaker Designer - Not even on the Internet"
                          “Pride is your greatest enemy, humility is your greatest friend.”
                          "If the freedom of speech is taken away, then dumb and silent we may be led, like sheep to the slaughter."

                          Comment


                          • #14
                            Originally posted by JasonP View Post

                            I considered the "restore to on" setting in BIOS to tell the board to start when power is connected but I worry what would happen if the bios was reset somehow and I wasn't the one using it to reconfigure the board.
                            The BIOS has to be specifically programmed to change its parameters. The parameters are stored in non-volatile ram. I've never had an instance of the BIOS being "reset" without human intervention in the 30 years since PCs came out.

                            Perhaps others have had a different experience.

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                            • #15
                              Originally posted by Millstonemike
                              The BIOS has to be specifically programmed to change its parameters. The parameters are stored in non-volatile ram. I've never had an instance of the BIOS being "reset" without human intervention in the 30 years since PCs came out. Perhaps others have had a different experience.
                              Right. It would be next to impossible, if not impossible without human tinkering. Sent from my SCH-S968C using Tapatalk
                              craigk

                              " Voicing is often the term used for band aids to cover for initial design/planning errors " - Pallas

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