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