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Toggle to Momentary Relay Output


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kapp1 
Member - Posts: 2
Member spacespace
Joined: June 07, 2020
Location: Australia
Posted: June 07, 2020 at 1:27 AM / IP Logged Link to Post Post Reply Quote kapp1
Hi
I have the need to convert an on/off toggle switch to a momentary relay output.
When the toggle switch changes from On - off - on (etc) a momentary pulse (1 sec or less) is required from the relay.
There must be no voltage on the relay output.
I would prefer to use a 12 volt relay on the input side
Thanking you in advance
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 07, 2020 at 7:23 PM / IP Logged Link to Post Post Reply Quote i am an idiot
Do you need a pulse when off to on, and then the same when you turn it back off?
i am an idiot 
Platinum - Posts: 13,666
Platinum spaceThis member consistently provides reliable informationspace
Joined: September 21, 2006
Location: Louisiana, United States
Posted: June 07, 2020 at 7:28 PM / IP Logged Link to Post Post Reply Quote i am an idiot
This in conjunction
with this will do it
Connect both of the switched 12 v connections to the switch. Connect the 2 output connections to your device that needs the pulse.
kapp1 
Member - Posts: 2
Member spacespace
Joined: June 07, 2020
Location: Australia
Posted: June 08, 2020 at 12:47 AM / IP Logged Link to Post Post Reply Quote kapp1
Yes iam after a pulse when a switch is turned on & another pulse when switch turned off.
it is for controlling model railway signals.
When I turn the switch ON - the relay buzzes & may/may not momentarily pulse the relay
When I turn switch OFF (ground) the relay pulses perfectly every time.
I have been using the following 12V SPDT 10A Relay:
- Rated voltage - 12V DC
- Coil current - 30mA
- Coil resistance - 400ohms
- Contact rating - 3 Amp-
Iam going to try 12V SPST Reed Relay
- Contact form: SPST normally open
- Coil Resistance: 1050ohms
- Nom Volts: 12
- Pickup Voltage: 8.4V DC
- Rated Current: 11.4mA

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