I have a 12V Momentary switch that I need to stay latched until the switch is depressed again. I've seen a few off the shelf boards that come close to doing it, but not exactly what I need. For example - this module uses a momentary input, but I need my 12V switch to be the controller, which it can't handle.

I've looked around a bunch over the last few weeks and haven't been able to find an off the shelf part that fits my needs, but it seems like a straight forward use case that I'm sure someone has solved before. I'm not well versed on the electronics lingo, so I'm sure I'm just using the wrong words in my searching, so hoping someone on here can help bridge that gap.

Thanks!

 

Controller?

 

Controller?

I meant that I want my 12V switch to control the switching on the module, not the integrated button.

 

What exactly do you mean by a 12v switch? I'm guessing your momentary switch is connected to a 12v supply, so pressing it gives 12v and releasing it is open circuit?

 

I meant that I want my 12V switch to control the switching on the module, not the integrated button.

not familiar with the unit but i guess that white connector and supplies 2-wire cable is meant to use external button instead of one that is onboard. still no electrical specs, chances are the buttons are tied together to an MCU pin so 12V input is not an option unless one adds some circuitry. in this case 2x ULN2803 would probably do.

still using JK or T flip flops is amongst the simplest and cheapest options. using 4000B series chips, they can work up to 18V. one IC like 4027B has two of them. no programming required.

 

Post #11 here https://forum.allaboutcircuits.com/...-pushbutton-switch-circuit.53205/#post-810504
For relay flip-flop circuit, one PB.

 

What exactly do you mean by a 12v switch? I'm guessing your momentary switch is connected to a 12v supply, so pressing it gives 12v and releasing it is open circuit?

Yes, that is what I meant.

 

not familiar with the unit but i guess that white connector and supplies 2-wire cable is meant to use external button instead of one that is onboard. still no electrical specs, chances are the buttons are tied together to an MCU pin so 12V input is not an option unless one adds some circuitry.

Yes, this is the case. The white wires just need contact with each other to trigger.

 

so this should be easy to interface for other uses. you can connect transistor across it and control it from external source.
for example that transistor could be output stage of an optocoupler. then you can drive the input of the optocoupler with anything you like. just make sure to choose LED current limiting resistor correctly... assume 8-10mA and 1.3V.

for example to trigger the input from some 12V circuit, resistor would need to be
(12V - 1.3V)/0.01A = 1k Ohm

 

in this case 2x ULN2803 would probably do.

still using JK or T flip flops is amongst the simplest and cheapest options. using 4000B series chips, they can work up to 18V. one IC like 4027B has two of them. no programming required.

Is there an off the shelf solution that's similar to the original module I posted? I don't think trying to assemble my own board would be feasible on my end.

 

so what is your comfort level, how soon do you need to have parts in your hands and how many of such units are needed?

 

Is there an off the shelf solution that's similar to the original module I posted?

Original plus this relay Module

 

so what is your comfort level, how soon do you need to have parts in your hands and how many of such units are needed?

Comfort level pretty low, the sooner the better, and it's just a one off.

 

Original plus this relay Module
View attachment 349626

I considered this option, so thank you for confirming my suspicions. What tells you that the output of the red module isn't also powered 12V?

 

it is obvious from product pictures that relay contacts are not connected to rest of the circuit. so you can use contacts as you please - in this case as external push button.

 

Why not simply get an ALTERNATE ACTION push button switch?? Nothing else required: Push and it is ON, push again and it is OFF.

 

I have a 12V Momentary switch that I need to stay latched until the switch is depressed again. I've seen a few off the shelf boards that come close to doing it, but not exactly what I need. For example - this module uses a momentary input, but I need my 12V switch to be the controller, which it can't handle.

I've looked around a bunch over the last few weeks and haven't been able to find an off the shelf part that fits my needs, but it seems like a straight forward use case that I'm sure someone has solved before. I'm not well versed on the electronics lingo, so I'm sure I'm just using the wrong words in my searching, so hoping someone on here can help bridge that gap.

Thanks!

Tyco S89R11DBD1-12 Impulse Latching Relay datasheet at https://www.te.com/en/product-6-1393134-5.html

 

Why not simply get an ALTERNATE ACTION push button switch?? Nothing else required: Push and it is ON, push again and it is OFF.

maybe controller does not have a finger. could be an MCU or whatever. TS was not exactly forthcoming with info

 

Explore the relay I used decades ago : Midland Ross 327-21B200 or modern equivalent. Perhaps ----> https://www.newark.com/panasonic-el...dc/signal-relay-tq-series-latching/dp/26M4309

 

I used a couple of these latching relays some time ago. One push and the relay latches on, One more push on the same button and the relay latches off. No current required when the push button is released. These relays were / are obtainable from a few different firms. Google for latching relays and you should get a few hits.

good luck.