Momentary Switch

mourip · 24th June 2006, 03:17 AM

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

frank1 · 24th June 2006, 09:53 AM

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

cpemma · 25th June 2006, 03:40 PM

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.

mourip · 25th June 2006, 08:53 PM

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

poobah · 25th June 2006, 08:57 PM

"alternate" or "push-push" are terms that might help you...

AndrewT · 26th June 2006, 08:13 AM

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.

richie00boy · 26th June 2006, 09:13 AM

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.

cpemma · 26th June 2006, 08:33 PM

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.

poobah · 26th June 2006, 08:41 PM

You guys work for Lucas by any chance?

cpemma · 26th June 2006, 08:46 PM

<bad pun>
Dey do, Omron, dey do, Omron...
</bad pun>

24th June 2006, 03:17 AM	#1
mourip diyAudio Member Join Date: Apr 2004 Location: Washington, DC	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

26th June 2006, 08:13 AM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

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25th June 2006, 03:40 PM	#3
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	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.

25th June 2006, 08:53 PM	#4
mourip diyAudio Member Join Date: Apr 2004 Location: Washington, DC	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

25th June 2006, 08:57 PM	#5
poobah diyAudio Member Join Date: Nov 2005	"alternate" or "push-push" are terms that might help you...

26th June 2006, 08:41 PM	#9
poobah diyAudio Member Join Date: Nov 2005	You guys work for Lucas by any chance?

26th June 2006, 08:46 PM	#10
cpemma diyAudio Member Join Date: Jul 2003 Location: S Yorkshire OK	<bad pun> Dey do, Omron, dey do, Omron... </bad pun>

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