Geekzone: technology news, blogs, forums
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.

1219 posts

Uber Geek
+1 received by user: 56

Topic # 82763 5-May-2011 10:53
Send private message

Short version:

If I currently have a "normally open" switch, which closes when pressed, and goes back to normally open when released - and this is plugged into a device which turns on with first press, and off with second press, then what sort of switch would I need that would turn the device on when switch is pressed, then off when switch is released?

Long version:

I have an electric guitar and effects unit. The manual states a "non latching, momentary switch" must be used. This can have multiple actions, but I'm concerned with turning effects on and off. To me, the word momentary suggested that it would turn the effects on only while pedal is pressed, then automatically off once released. This is exactly what I wanted.

So I bought a pedal, (not the recommended one as they are no longer manufactured) which I believe is normally open, but it takes one press to turn effects on, and a second press to turn off. So now I'm wondering if there is a switch type I could use that would by whatever means turn it on when pressed, and stay on while held, and turn off when released. To I guess to achieve this is must go from open to closed when pressed, then when released go from closed to open to closed to open?

Create new topic
4806 posts

Uber Geek
+1 received by user: 82


  Reply # 465690 5-May-2011 12:33
Send private message

This is the definition of a momentary switch. It stays on only when pressed down and turns off when released.

I bought a couple of those recently when I was trying to make a IR emitter inserted into the shell of a whiteboard pen. So I could press the button to get the IR beam to come on and have it turn off when I released my finger.

My electronic piano at home has the same functionality. Press the pedal down and it turns on the sustain function, release the pedal and the sustain turns off.

They should be easy enough to find in a music store.

System One: Popcorn Hour A200,  PS3 SuperSlim, NPVR and Plex Server running on Gigabyte Brix (Windows 10 Pro), Sony BDP-S390 BD player, Pioneer AVR, Raspberry Pi running Kodi and Plex, Panasonic 60" 3D plasma, Google Chromecast

System Two: Popcorn Hour A200 ,  Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Samsung 4K player, Google Chromecast


My Google+ page 



1219 posts

Uber Geek
+1 received by user: 56

  Reply # 465709 5-May-2011 13:14
Send private message

The pedal I bought is a sustain pedal for an electronic keyboard.

When measured with a voltmeter its open normally, closed while pressed and held, and open once released.

The effects unit though, acts on 1 press to turn on and another to turn off, which makes me wonder why they specify a momentary normally open switch/pedal? As it seems this is exactly the same as how a latching switch performs?


805 posts

Ultimate Geek


  Reply # 465711 5-May-2011 13:20
Send private message

Ok, so it requires a pulse to turn it on then a pulse to turn it off. You want to hold the pedal down for it to be on and then release the pedal for it to be off? Let me think about it...

805 posts

Ultimate Geek


  Reply # 465713 5-May-2011 13:24
Send private message

I don't know if i'm on the right track but I imagine the unit is designed so that you don't have to hold your foot on it while using the effect.

805 posts

Ultimate Geek


  Reply # 465715 5-May-2011 13:28
Send private message

I don't know of any mechanical switches that would do it but you could make a micro circuit that would operate how you want it.

1219 posts

Uber Geek
+1 received by user: 56

  Reply # 465727 5-May-2011 13:43
Send private message

What a dumb design then. If one wanted it to stay on then one could design it to using a latching switch.

Probably a silly question, but would using a stereo cable make any difference? Maybe they might send an off pulse on the other channel?


9486 posts

Uber Geek
+1 received by user: 1383

  Reply # 465853 5-May-2011 17:30
Send private message


Does it (a) turn on when you press and hold, or does it (b) only turn on when you press and release?

mattRSK: I don't know of any mechanical switches that would do it but you could make a micro circuit that would operate how you want it.
If (a) is true, maybe a DTDP momentary will do the job? I guess the pedal will incorporate some de-bounce so a microswtich  might be too fast, but a DTDP momentary thumb press might work.

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:

Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:

Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:

News »

Stuff Pix enters streaming video market
Posted 21-Mar-2018 09:18

Windows no longer Microsoft’s main focus
Posted 13-Mar-2018 07:47

Why phone makers are obsessed with cameras
Posted 11-Mar-2018 12:25

New Zealand Adopts International Open Data Charter
Posted 3-Mar-2018 12:48

Shipments tumble as NZ phone upgrades slow
Posted 2-Mar-2018 11:48

Oppo R11s: high-end Android, budget price
Posted 27-Feb-2018 16:27

Samsung New Zealand introducing the Galaxy S9 and S9+
Posted 26-Feb-2018 07:00

Fujifilm X beats its best with new top of the range, high-performance camera
Posted 24-Feb-2018 14:05

One million kiwis affected by cybercrime
Posted 24-Feb-2018 13:58

New Zealanders want to engage with government online and via mobile apps
Posted 24-Feb-2018 13:56

Samsung launches Samsung Max
Posted 24-Feb-2018 13:52

CPTPP text and National Interest Analysis released for public scrutiny
Posted 21-Feb-2018 19:43

Foodstuffs to trial digitised shopping trolleys
Posted 21-Feb-2018 18:27

2018: The year of zero-login, smart cars & the biometrics of things
Posted 21-Feb-2018 18:25

Intel reimagines data centre storage with new 3D NAND SSDs
Posted 16-Feb-2018 15:21

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.