Question Do momentary contactors exist?

jt2281cc

Commendable
Jan 9, 2019
39
0
1,530
0
I'm trying to get a 3.3v constant signal to trigger a Mp3 file to play. My plan is a mp3 module board, a 3w 4ohm speaker, and potentially a contactor to press play on the Mp3 board, the problem is, a short press is "play" a long press is settings or something..

Looking for a contactor that upon receiving signal snaps closed/open and then back? Or any other way to accomplish the above.
 

USAFRet

Titan
Moderator
Mar 16, 2013
134,332
6,289
165,640
20,760

jt2281cc

Commendable
Jan 9, 2019
39
0
1,530
0
For anyone reading, the backstory on this:
Wasn't trying to go crazy with a second thread, just wanted to ask a more general question about them in an environment that may have a people familiar with such parts. Was thinking this section may have been the place to ask now that I know what I'm looking for...
 

USAFRet

Titan
Moderator
Mar 16, 2013
134,332
6,289
165,640
20,760
Wasn't trying to go crazy with a second thread, just wanted to ask a more general question about them in an environment that may have a people familiar with such parts. Was thinking this section may have been the place to ask now that I know what I'm looking for...
Right.
Just trying to give people the story, instead of them asking the same questions that were answered earlier.
 
Reactions: jt2281cc

jt2281cc

Commendable
Jan 9, 2019
39
0
1,530
0
I ordered something similar in theory. I got a timed relay. I SHOULD be able to set it to go off once for 1 second each time it is energized... I can't wait to put everything together and give it a test.
 

jt2281cc

Commendable
Jan 9, 2019
39
0
1,530
0
I would recommend you google "momentary high pulse circuit"
You will see threads like this -- https://forum.allaboutcircuits.com/threads/need-schematic-for-1-pulse-timer-and-off.46850/
Not a momentary contact switch but a momentary contact circuit.
So I figured this out. Products used linked at the end.

I found a timed relay that gets triggered by anywhere from 3v-30v. Also the Mp3 module would play upon powering up. So, off the PSU of my pc I’ll be using a molex->female usb wire, and then a usb-double tail micro usb. The first micro usb powers the contactor. The second I splice the wire open and grab the +5v wire (red in my case) and interrupt it, running through the N/O side of the contactor. And plug the interrupted 5v micro usb into the mp3 module to power it when the circuit is closed. I then obviously load the mp3 I want to play onto a fat32 formatted sd-card, insert that into the mp3 module and wire in the speakers. I set the timer on the relay to only open for the length that my Mp3 file is.

From there I’m going to tap into the ~3.3v wire that turns on with the LED for the front IO panel power button. That means when the PC turns on, that light turns on immediately, that triggers the relay to close for ‘X’-seconds, that powers up the module to immediately play an Mp3 file, and then turns the mp3 module back off when it’s finished. This relay will only run once per time it receives power, and not loop.

https://www.amazon.com/gp/product/B07M9VWL6Y/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
Timed Relay

https://www.amazon.com/gp/product/B01DK9SL6C/ref=ppx_yo_dt_b_asin_title_o06_s02?ie=UTF8&psc=1
MP# module

https://www.amazon.com/gp/product/B0738NLFTG/ref=ppx_yo_dt_b_asin_title_o06_s01?ie=UTF8&psc=1
Speakers

https://www.amazon.com/gp/product/B07K835MNR/ref=ppx_yo_dt_b_asin_title_o06_s02?ie=UTF8&psc=1
SD card
 

ASK THE COMMUNITY

TRENDING THREADS