Maker Pro
Maker Pro

Help with simple relay circuit

DarenHawes

Feb 4, 2014
2
Joined
Feb 4, 2014
Messages
2
Hi, I am looking for a simple wiring diagram that I wish to build on Veroboard for a push button relay control. The relays will be simply switching switches on an 3rd party board, no current or voltage etc.

I have tried my best to explain the functionality in the attached PDF.

I really aprechiate your help!

Thanks Daren
 

Attachments

  • Push Button Relay Circuit.pdf
    26.2 KB · Views: 157

Harald Kapp

Moderator
Moderator
Nov 17, 2011
12,516
Joined
Nov 17, 2011
Messages
12,516
Welcome Daren.

Your circuit diagram has the wires a bit mixed up and no visible connections (dots). Anyway, here's what you're looking for:
attachment.php


The contact at the top left will kepp the relays closed once they are triggered by the pushbuttton.
You will need different relays (1*2 normally open contacts, 1*normally open+normally closed contact).
 

Attachments

  • relais.png
    relais.png
    465 bytes · Views: 213

DarenHawes

Feb 4, 2014
2
Joined
Feb 4, 2014
Messages
2
Thank You

To confirm the switch is NOT a toggle and only push button.

Meaning it needs to like latch and swap on each button press.

It's a micro switch running the switch part.

Hope this circuit works as it looks simple.

Thank you!
 

Harald Kapp

Moderator
Moderator
Nov 17, 2011
12,516
Joined
Nov 17, 2011
Messages
12,516
Yes, a pushbutton.
The latching action is realised by the feedback via the normally open contact of the left relay.
 

mursal

Dec 13, 2013
75
Joined
Dec 13, 2013
Messages
75
Meaning it needs to like latch and swap on each button press.

How do you mean swap?

The above circuit will latch on, but you will need to disconnect the power to switch it off, or am I missing something?

You will need a reset switch on the tieback circuit to open the contacts, turn the relays off.
 
Last edited:

davenn

Moderator
Sep 5, 2009
14,011
Joined
Sep 5, 2009
Messages
14,011
How do you mean swap?

The above circuit will latch on, but you will need to disconnect the power to switch it off, or am I missing something?

You will need a reset switch on the tieback circuit to open the contacts, turn the relays off.

he means each time the button is pressed it latches in the other "direction"

Dave
 

Harald Kapp

Moderator
Moderator
Nov 17, 2011
12,516
Joined
Nov 17, 2011
Messages
12,516
My circuit will latch on and stay there, regardless of any more presses of the button.
That's what was requested in the op's pdf:
1. On power up the Push Switch will be open. Relay 1 contacts need to be open and Relay 2
(Contact 1) needs to be open and Relay 2 (Contact 2) needs to be closed
2. On push of Push Switch (not toggle, one push) Relay 1 needs to close (and stay closed) and
Relay 2 swaps (Contact 1 – becomes closed, and stays closed whilst Contact 2 – opens and
stays open)
Yes, you will need to interrupt the power to reset the circuit. A second pushbutton (normally closed, open on push) in series with the power supply can be used.
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
8,393
Joined
Nov 28, 2011
Messages
8,393
If you want a circuit that toggles between two states when you push a button, have a look at https://www.electronicspoint.com/need-help-needed-circuit-t254020.html#post1508062

It uses a latching relay. It will power up in whatever state it was in before it was powered down, which doesn't fit with your specification. This could be fixed with the addition of two capacitors, two resistors and two diodes. Let me know if you want to pursue this.

The output is wired to provide a bipolar (reversing) voltage to a motor with limit switches, but you can use either contact to drive other relays.
 

mursal

Dec 13, 2013
75
Joined
Dec 13, 2013
Messages
75
If we were to use a push button switch with a built in latch would that be over simplifying the solution?

We could use Harald's 2 relays without the tie-pack circuit to the coils?
 
Last edited:

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
8,393
Joined
Nov 28, 2011
Messages
8,393
I think the word "toggle" may be causing confusion. A "toggle" switch has a long shaft that you use to flip it between two or more positions. In the sense I used it in post #8, "toggle" means to alternate between two states. So you push the button and the circuit flips to state 1, push the button again and it flips to state 2, push the button again and it flips to state 1, button again flips to state 2, and so on, alternating from one state to the other each time the button is pressed.

The design I linked to implements this toggle action. It is driven from an SPST pushbutton, and each press flips (toggles) it to the opposite state. It remembers the state using a latching relay. This relay can then drive other relays to provide more outputs.

mursal, the pushbutton you linked to is called a "push on, push off" switch. It physically latches into one of two positions - ON or OFF - and each press and release toggles it to the other position. This pushbutton cannot be unlatched when power is applied to the circuit, which is required by Daren's specification.

I don't understand your other question. What is a "tie-pack"?
 

KrisBlueNZ

Sadly passed away in 2015
Nov 28, 2011
8,393
Joined
Nov 28, 2011
Messages
8,393
That's a neat little circuit Harald. It will always power up in a defined state.
 

mursal

Dec 13, 2013
75
Joined
Dec 13, 2013
Messages
75
Thanks for that Kris, the tieback circuit I referred to, was the connection from pin DIN87 on the relay, to the relay coil supply pin DIN 86. To latch the relay on.

Yes, a tidy solution by Harald
 
Last edited:
Top