cheapest way of turning on many optocouplers based on a -+ common signal

[ali_asadzadeh]

Hi,
I know it may sound very simple, I should use a bridge rectifier, but as I have only a common ground to about 1024 LED’s and it can be either positive or negative, since in some systems the common signal is ground or Positive ground, do we have a better way of avoiding 1024 individual diode bridges, see the sample circuit.

[ajb]

Use AC input optocouplers?

[ali_asadzadeh]

Thanks, do you have any part number with similar prices to normal ones?

[spec]

Hi ali_asadzadeh

You say that the input voltage can be either positive or negative, depending on the system feeding the LED matrix. At any one time will there be a mixture of positive and negative inputs, or will they all either be positive or all negative- hope that makes sense

Does the LED matrix have any power of its own, or could a small power supply(5V @100mA say) be added- perhaps a battery (neither to power the LEDs).

[DaJMasta]

I'm also sort of confused about what's going on, you say it's a matrix of LEDs but it's optocouplers?  Are you actually sending data with something like a differential input signal, or are you just trying to drive a lot of LEDs?

What is the device and what do you want to make it do?

[spec]

The way it reads is that they are LEDs inside an optocoupler. For the purpose of answering the OP's question we don't really need to know anymore in that area.

[ali_asadzadeh]

Thanks, we have 1024 optocouplers , so I meant the led inside the optos

We have one common signal and 1024 individual inputs, the inputs should be configured so that they could detect a positive or a negative common signal, because the customer have different sites with different common signal configuration.

[ali_asadzadeh]

I have a new Idea! maybe Padauk MCU's come in handy