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Jun
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comment Driving a common cathode 8x8 RGB LED Matrix with PWM
@joh Ok, right. For some reason, I wasn't able to see the datasheet, from Chrome. Now I've tried from IE9, and I saw it.
Jun
2
comment Can a dynamic circuit extract all energy from an ultra capacitor?
@Anthony It is not expensive, but not easy, either. You should not do it on a breadboard, and the PCB layout, being it not difficult, is not trivial for someone new to electronics. I don't know what's your experience doing PCBs. // If you can buy a "step-up" or "step-up/down" dc-dc converter already done, it will be best. I can't recommend any specific one, because I don't know the specs.
Jun
2
comment Driving a common cathode 8x8 RGB LED Matrix with PWM
You have 192 anode terminals and one cathode terminal. How would you excite 192 anodes with 24 current-sourcing nodes, keeping all LEDs independent?
Jun
1
comment Driving a common cathode 8x8 RGB LED Matrix with PWM
@Kortuk He would need 8x8x3=192 of them :)
Jun
1
comment In terms of protection, how does this automotive power supply circuit look?
Don't we need to see the second page of the schematic? It says "Sheet 1/2". // Some labels, like VIN, and BPOS, only appear once. Where do they go? // How much is VCLEAN for you?
Jun
1
comment Driving a common cathode 8x8 RGB LED Matrix with PWM
"Is there any way to use a current-sinking LED driver to drive a common-cathode LED matrix?" No.
Jun
1
comment Analog to Digital Converter and Negative Voltages
+1 Sure. This must be it. Looks like I didn't read the question :). // @Nevermored, if the V- supply pin of your opamp is at the same voltage than its non-inverting input, you don't need the diodes. Just let the opamp clip the output. Even without diodes, the opamp is not able to produce negative voltages. So, it will still give you the positive portion of the signal. There is a speed penalty, but at 50 Hz, you won't notice anything at all.
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