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Old 24th June 2006, 03:17 AM   #1
mourip is offline mourip  United States
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Default Momentary Switch

Howdy,

I have a basic question regarding momentary switches.

I would like a pushbutton switch that makes contact the first time you push it and breaks contact the second time you push it.

What would this be called? I want to ask for the right thing when I order from Mouser

Thanks a lot,

Paul
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Old 24th June 2006, 09:53 AM   #2
frank1 is offline frank1  United Kingdom
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Default Re: Momentary Switch

Quote:
Originally posted by mourip
Howdy,

I have a basic question regarding momentary switches.

I would like a pushbutton switch that makes contact the first time you push it and breaks contact the second time you push it.

What would this be called? I want to ask for the right thing when I order from Mouser

Thanks a lot,

Paul
A latching push button switch

Frank
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Old 25th June 2006, 03:40 PM   #3
cpemma is offline cpemma  United Kingdom
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Or if you can't get the pb switch appearance you want in latching, you can use any non-latching normally-open switch with a flip flop circuit switching a relay.
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Old 25th June 2006, 08:53 PM   #4
mourip is offline mourip  United States
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Thanks for the replies. Searching on "latching" in Mouser was much more productive. Now if I can find a panel mount button type I will be all set.

Best,

Paul
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Old 25th June 2006, 08:57 PM   #5
poobah is offline poobah  United States
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"alternate" or "push-push" are terms that might help you...
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Old 26th June 2006, 08:13 AM   #6
AndrewT is offline AndrewT  Scotland
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Hi,
you can use two (or maybe three) interconnected relays to achieve latching action with a non latching push switch.

Gives you more choice of low current/low voltage switches.
The last relay is the only one that needs to meet your load switching duty.
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Old 26th June 2006, 09:13 AM   #7
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Quote:
Originally posted by AndrewT
Hi,
you can use two (or maybe three) interconnected relays to achieve latching action with a non latching push switch.

Gives you more choice of low current/low voltage switches.
The last relay is the only one that needs to meet your load switching duty.
Yes and the circuit was posted on here some time in the last 12 months or so.
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Old 26th June 2006, 08:33 PM   #8
cpemma is offline cpemma  United Kingdom
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Quote:
Originally posted by richie00boy
Yes and the circuit was posted on here some time in the last 12 months or so.
http://www.diyaudio.com/forums/showt...870#post577870 ?

3-pole relays being the price they are, it's an expensive solution.

Another method that works in (my) simulation, you may need to tweak R3 to get the right gate voltage. Adapted from a sci.electronics.design thread with a P-mosfet for Q2, but I couldn't get that to work.
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Old 26th June 2006, 08:41 PM   #9
poobah is offline poobah  United States
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You guys work for Lucas by any chance?

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Old 26th June 2006, 08:46 PM   #10
cpemma is offline cpemma  United Kingdom
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<bad pun>
Dey do, Omron, dey do, Omron...
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