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Bistable relay control

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jan_de_jong(at)casema.nl
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Posted: Tue Mar 08, 2011 9:33 am Post subject: Bistable relay control

I'm thinking of making a monostable relay type control for bistable 

relays (if and when) in one or more (or none) of the following shapes:

- 2 square inches of pcb

- mounted in a DSub DE-9 backshell

- integrated with a Tyco BDS-A contactor plug

Components will be SMD's.



Attached two contemplated variations.



Any and all comments welcome.



Jan de Jong

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JLuckey(at)pacbell.net
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Posted: Tue Mar 08, 2011 10:57 am Post subject: Bistable relay control

Jan,



I'm assuming that you are referring to the Tyco latching relays that were

discussed here a few weeks ago.



That looks like a lot of (pretty cool) engineering, but is it really

necessary?  I'm thinking that a SPDT (on)- off - (on) toggle switch is all

that is really req'd to control the Tyco latching relay.



Am I missing something?



--

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jan_de_jong(at)casema.nl
Guest

Posted: Tue Mar 08, 2011 12:51 pm Post subject: Bistable relay control

Jeff,



You are absolutely right.

It is only when one wants to do more than switch one latching relay on 

and off that it is useful for latching relays to behave like monostable 

relays.



Say there are several latching relays in a system:

1. Progressive power down may be needed so that a relay has power for 

switching off (can also be in a checklist)

2. It may be nice to have a handle position reflect a relay state (can 

also be provided with an indicator led)

3. The system requires automation - automation has open/close outputs 

and cannot be expected to provide pulses.



Jan de Jong



Jeff Luckey wrote:

[quote] 



 Jan,



 I'm assuming that you are referring to the Tyco latching relays that were

 discussed here a few weeks ago.



 That looks like a lot of (pretty cool) engineering, but is it really

 necessary?  I'm thinking that a SPDT (on)- off - (on) toggle switch is all

 that is really req'd to control the Tyco latching relay.



 Am I missing something?



 --

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