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Author Topic: 3 way on off on momentary switch suitable for replacing in a transmitter  (Read 3299 times)

boat captain

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Does anybody know of a suitable switch for a futaba transmitter.
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Joe
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BrianB6

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #1 on: September 07, 2017, 04:58:21 am »

Presumably:
       DPDT Miniature Toggle Switch - Solder Tag Centre Off(on - off - on)
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bfgstew

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #2 on: September 07, 2017, 07:35:18 am »

Plenty on flea bay
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boat captain

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #3 on: September 07, 2017, 08:17:29 am »

 I am after a Futaba or or other transmitter type.  I use the ones on fleabay for other projects.
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bfgstew

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #4 on: September 07, 2017, 09:19:54 am »

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canabus

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boat captain

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #7 on: September 07, 2017, 12:40:28 pm »

Those that have been quoted are not momentary ie spring return to center off.


Thanks though.
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bfgstew

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #8 on: September 07, 2017, 01:01:20 pm »

So you need centre position as off and up and down as on with spring return to centre?
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bfgstew

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boat captain

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #10 on: September 07, 2017, 02:20:35 pm »

So you need centre position as off and up and down as on with spring return to centre?


that's correct
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malcolmfrary

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #11 on: September 07, 2017, 07:03:15 pm »

There might be a switch of that size that has spring return, out there, but I doubt it.  The types pointed to latch in three positions, but have the option that having been switched to one side or the other, can be manually reset to center.
If the circuit that it is to be used in is known, it is often possible to convert a steady state step change of state into a pulse by involving a capacitor.  But you really need to know the exact details of the circuit to get it to work.  Usually, the switch just selects between the three states to give the right signal pulse length which results in, say, a servo, plugged into that channel at the receiver end will take up whatever that position corresponds to.  If its a switcher plugged in, the switcher would be the item that selects between momentary and latching.
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C-3PO

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #12 on: September 07, 2017, 07:22:30 pm »

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boat captain

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #13 on: September 08, 2017, 07:29:20 am »

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C-3PO

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #14 on: September 08, 2017, 08:50:51 am »

Might be worth hitting eBay with the description "3-position spring-loaded centred"

I found some switches that look like they may have same functionality for £2

C-3PO
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malcolmfrary

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #15 on: September 08, 2017, 08:57:42 am »

http://uk.rs-online.com/web/p/toggle-switches/7347233/
Might be the one, but scrolling down the page you get an options list that lets the site search for near matches.  Quite a few.
Looking on Farnell's site in the switch section and applying their search options gives a few candidates as well.
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cos918

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #17 on: September 08, 2017, 04:00:07 pm »

momentary contact is what is use on solenoid point motors used in model railways .


john 
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malcolmfrary

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Re: 3 way on off on momentary switch suitable for replacing in a transmitter
« Reply #18 on: September 09, 2017, 09:40:57 am »

momentary contact is what is use on solenoid point motors used in model railways .


john
Nearly - solenoids used "passing contact".  As the switch lever was operated, it would complete the circuit during its passage to the new position, hopefully operating the point.  To avoid cooking the motor, the circuit was broken before the lever got latched in its new position, where it indicated the point setting.  That was true for the Old Hornby switches, and is for the Kato switches that I just looked at. 
A non-latching three position switch that spring returns to center could be used if it could repeatedly carry the current, but the operator would need a good memory.
Looking at the links, any switch shown with the lever off to one side won't be momentary, the ones shown with the lever centered might be.  Careful reading of the spec. needed.
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