SSR

tiraas

Does anyone know of a solid state photo relay that can receive 3-5v 10mA input that can do 5 - 25amps dc switching for less than $4 each?

If it is multi packaged then $4 per channel
An alternative would be an AND gate of some sort with 2 optical isolated inputs to do the same as the relay, but my design capabilities are limited since I am a software programmer.

I have a 64x64 array of outputs so I need essentially a 4096 relay matrix.
However I need to keep the costs minimal.
The 4096 nodes are sequentially addressed in columns of 64 usually for 30 seconds per row.
I thought 64 relays could do this, switching to 0v and ULN2803's providing the +, although this isn't an isolated solution.
If anyone can think of a better solution, I am all ears.

Thanks, tiraas.

localroger

You're not going to find anything new in that price range. That's heavy amperage for a SSR; you may need heatsinks. The last time I sourced something in that range I paid $30 each, and that was some years ago and since I only needed one I didn't shop very hard. Your best bet is to hope something turns up in surplus.

erco

Even getting a 30A mechanical relay under $4 is hard. Could you use 12V auto lighting relays?

http://www.ebay.com/itm/JQX-15F-T90-Electromagnetic-Relay-12V-DC-COIL-30A-240V-AC-20A-28V-DC-/360521546918?pt=LH_DefaultDomain_0&hash=item53f0c23ca6

EDIT: You could use a ULN2003/2803 darlington array to drive 7 or 8 at at time with the control signal you describe. Even if you buy this premade $1.83 board to run 4 of the above relays, your cost per channel is 46 cents plus $2.89 equals $3.35.

http://www.ebay.com/itm/ULN2003-Stepper-Motor-Driver-Board-for-Arduino-AVR-AR-NEW-/110954690452?pt=LH_DefaultDomain_0&hash=item19d56a3794

kwinn

Can you provide some more detail on how this array is switched and what it is driving?

Are all the relays in a row providing 5 - 25A at once (total of 320 - 1600A)?

Do you step through the 64 rows in turn and have them on for 30 seconds each?

Can you post a diagram of the array?

Perhaps it is possible to multiplex this and reduce the number of relays, but there is not enough detail posted to say.