12v 2ch 433 RF Relay - Wiring Question…

[twixx]

I’m frazzled and I cannot get my head around this.

I have a single 2 wire speaker that I want to use as my output. But have 2 sources that I want to choose from.

Will this work?

Have I over-egged it?

I don’t believe I need the relay to do anything other than close the relevant circuit (A/B) when I press either A/B on the remote.

 

[twixx]

Or

 

[333rocky333]

Looks to me like if you operate the relays they will short out the source and likely damage it

 

[RandomGrinch]

Unless I'm missing something...

 

[twixx]

Looks to me like if you operate the relays they will short out the source and likely damage it

That’s why I’m here. Something just doesn’t feel right with what I’ve got.

Unless I'm missing something...

View attachment 326880

How does that work with A and B being separate channels

 

[333rocky333]

i am no expert on hifi but the problem you may have is when both relays are off, no speaker would be connected to the sources and may have bad consequences for the sources.
Something similar to RGs post above with a bit of tweaking may work just join the - lines GREEN BLACK and BLUE together and not through relay. A
So when B relay switches it will change from source B to source A, by switching the + line only, however as above it will always leave one source with no speaker load, if thats an issue you may need resisters added to the circuit.
Obviously relay A could do the switching rather than relay B if thats more desirable.

 

[RandomGrinch]

How does that work with A and B being separate channels

Ahh, I didn't realise your module had channels.
I thought you were switching both relays on and off at the same time. With source A connected to N/O and source B connected to N/C

As above, commoning the negatives, could work, but can sometimes cause issues. So I was trying to avoid that.

As long as the module completely swapped the inputs (i.e. if when relay A is on, relay B is definitely off), you could try a slight modification...

However, taking account of @333rocky333 's comments on no-load, and possible slight delays in the switching of the relays; this isn't something you would want to add to a high end hi-fi system, and you definitely wouldn't want to switch the source when listening at high volumes!

Have you got a link to the module?

 

[twixx]

Thanks guys for your input thus far..

This is the module https://qiachip.com/blogs/usermenu/110v-220v-2-channel-receiver-guide

I intend to run in latching mode.

We’re not looking at hifi here.

 

[RandomGrinch]

I intend to run in latching mode

Latching mode looks good.
Try the wiring in the previous post and see what happens!

 

[twixx]

Ahh, I didn't realise your module had channels.
I thought you were switching both relays on and off at the same time. With source A connected to N/O and source B connected to N/C

As above, commoning the negatives, could work, but can sometimes cause issues. So I was trying to avoid that.

As long as the module completely swapped the inputs (i.e. if when relay A is on, relay B is definitely off), you could try a slight modification...

View attachment 326885

However, taking account of @333rocky333 's comments on no-load, and possible slight delays in the switching of the relays; this isn't something you would want to add to a high end hi-fi system, and you definitely wouldn't want to switch the source when listening at high volumes!

Have you got a link to the module?

Hi there, apologies for the delay… turned out I ordered the AC module and not the DC, so had to wait for that to arrive before I could play further…

The wiring you referenced works… (THANK YOU!! ️️)

But I seemingly have a problem with the module starting up in a neutral position, and not A/B… is there anything clever I could do with the wiring to force it into A/B from cold start??

 

[twixx]

Bridging 5&6 seemingly does the trick. Channel B is pretty much ‘always’ live that way.

Then with the relay on, it operates as normal.

Any danger to this?

 

[333rocky333]

You have now commoned the Negatives which i and @RandomGrinch were doubttfull about, he will be about soon to advise

 

[JohnW2]

You have now commoned the Negatives which i and @RandomGrinch were doubttfull about, he will be about soon to advise

Very justifiable ;doubts - but if the OP had done it, with things now working and nothing having blown up, I imagine that it's probably OK (i.e. he has 'got away with it') ?

Kind Regards, John

 

[RandomGrinch]

But I seemingly have a problem with the module starting up in a neutral position, and not A/B… is there anything clever I could do with the wiring to force it into A/B from cold start??

I've been thinking about it, and I can't come up with anything 'clever', with the contacts we have available on the relays.
There don't appear to be any extra inputs on the PCB that would allow an impulse to turn on a relay at startup (although if I had a board, I may investigate PA0 & PA1!)

Bridging 5&6 seemingly does the trick. Channel B is pretty much ‘always’ live that way.

As @333rocky333 says, you have commoned the negatives, which could more simply be wired as...

Even though relay B hasn't any connections, the 'latching' mode of the module will create your desired result, when button B is pressed on the remote.

but if the OP had done it, with things now working and nothing having blown up, I imagine that it's probably OK

Yes, agreed.
As we've heard already, this isn't hifi!
I was being a little cautious, as the option was there to separate the two channels, using both relays.

@twixx , may we ask what the sources actually are?


Edit: PA1 appears to link to the programming button, via, vias!

 

[twixx]

I've been thinking about it, and I can't come up with anything 'clever', with the contacts we have available on the relays.
There don't appear to be any extra inputs on the PCB that would allow an impulse to turn on a relay at startup (although if I had a board, I may investigate PA0 & PA1!)
View attachment 327269


As @333rocky333 says, you have commoned the negatives, which could more simply be wired as...

View attachment 327270
Even though relay B hasn't any connections, the 'latching' mode of the module will create your desired result, when button B is pressed on the remote.


Yes, agreed.
As we've heard already, this isn't hifi!
I was being a little cautious, as the option was there to separate the two channels, using both relays.

@twixx , may we ask what the sources actually are?


Edit: PA1 appears to link to the programming button, via, vias!

This is the source…

https://www.f150gen14.com/forum/threads/pedestrian-sounder-delete-no-codes-easily-reversible.6066/page-19#post-224089

It could be that I’ve not got the ‘best’ part for the job…. But