relay modules

[boji]

Jeff got me on to the Panasonic TQ2-12V DPDT Relay.
http://classicapi.com/catalog/product_info.php?cPath=102&products_id=187
They are nice and small, and sometimes sold for fairly cheap around the net.

I was attacking the same problem with an arduino and went with some diy buffer cards.
Thanks to sahib and a few others for help with the circuit.

Below is a link to a larger photo of what the cards are doing.
http://i184.photobucket.com/albums/x320/donbosse/ArduinoMuteSoloLogicBuffer.jpg

 

[Rochey]

Boji -- I'm fascinated by what you've done here, but I need to understand what you've done in more detail.

Can you tell us what you were trying to achieve at a higher level?

I don't quite understand
"6 goes to activated mute relay (expat, classicapi and mine, a four channel, two relay version)"

Cheers

Dafydd

 

[boji]

Sure Rochey,

Remember helping me with that "H" circuit awhile back? That was me trying to figure out how to mux and dim lots of leds off of one Mega.
I scrapped the mux and was rewarded with a very fast code loop

I think vids would be the quickest way to explain.

The arduino and accompanying buffer card is driving the color states of buttons, the logic of mute, solo, mute grouping, and driving relay mute pcb's that will be plugged into input cards of my API inspired mixer.

A picture of the dual relay mute card: http://www.groupdiy.com/index.php?topic=39204.msg607968#msg607968
A short vid: http://www.youtube.com/watch?v=eNJGjBTCvAM

I'm a coding newb, so what I wanted to do with my buttons was (for me) fairly complicated logic.
Here's a vid of the code starting to work: http://www.youtube.com/watch?v=9ysyU8XKjFI

The last thing to do was to stick a buffer card between the relay card and the arduino to ease the burden of lighting leds, grounding relays and button sensing.

Do these explanations help at all?

 

[ruffrecords]

Jeff got me on to the Panasonic TQ2-12V DPDT Relay.
http://classicapi.com/catalog/product_info.php?cPath=102&products_id=187
They are nice and small, and sometimes sold for fairly cheap around the net.

There's a 5V version of this too if you want avoid an extra power rail. These relays are the ones reputedly used by Amek in their Rupert Neve designed consoles. Its the one I use in the EZTubeMixer board.

Cheers

Ian

 

[Rochey]

The 5V ones only consume 28mA each. (according to the datasheet).

I'd be tempted to have a separate digital supply in a system, run separately from the nice linear system.
(In fact, I've always been tempted by those small 2A USB supplies.)

In which case, 5V relays work quite well, and I can have a LOT of relays/LED's/Micro's for 2A

Offtopic question - can you mix power supplies in a system like this, provided the grounds are connected (maybe through a bead?).

Will digital noise couple accross to the clean linear supplies? (e.g. on relay switch, or LED on/off)

Cheers

Rochey

 

[ruffrecords]

The 5V ones only consume 28mA each. (according to the datasheet).

I'd be tempted to have a separate digital supply in a system, run separately from the nice linear system.
(In fact, I've always been tempted by those small 2A USB supplies.)

In which case, 5V relays work quite well, and I can have a LOT of relays/LED's/Micro's for 2A

Offtopic question - can you mix power supplies in a system like this, provided the grounds are connected (maybe through a bead?).

Will digital noise couple accross to the clean linear supplies? (e.g. on relay switch, or LED on/off)

Cheers

Rochey

Yes, with care. Just connect the 0V to the safety earth star point  in the power supply the same way you do the other supply 0Vs.

To reduce/prevent interference it is a good idea to limit the rate of change of current going down the supply cabling. This is usually achieved by an RC network close to each relay so the local capacitor supplies the energy surge.

Cheers

Ian

 

[Rochey]

An rc on the base of the npn transistor would do that nicely I think.
?