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Topic # 82763 5-May-2011 10:53
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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?

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  Reply # 465690 5-May-2011 12:33
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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.

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  Reply # 465709 5-May-2011 13:14
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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?

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  Reply # 465711 5-May-2011 13:20
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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...

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  Reply # 465713 5-May-2011 13:24
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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.

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  Reply # 465715 5-May-2011 13:28
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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.

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  Reply # 465727 5-May-2011 13:43
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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?


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  Reply # 465853 5-May-2011 17:30
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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.

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