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It's upside down and smiling at me.
... I think
... I think
Category Photography / Abstract
Species Unspecified / Any
Size 900 x 675px
File Size 370.2 kB
4n27 Optoisolator :P
Input is the 'HDD LED' signal from the motherboard
Output is a 2x4 Yellow 5mm LED array, and a 1x2 Blue LED 3mm array -- each LED is a min of 1cd.
Second Blue LED is the HD activity LED on my case top panel -- only way I could do the mod AND still have this was to make the third loop through the output and add another LED which you see in my previous pic.
Input is the 'HDD LED' signal from the motherboard
Output is a 2x4 Yellow 5mm LED array, and a 1x2 Blue LED 3mm array -- each LED is a min of 1cd.
Second Blue LED is the HD activity LED on my case top panel -- only way I could do the mod AND still have this was to make the third loop through the output and add another LED which you see in my previous pic.
Have you thought about using hex buffer ic's, you can get more led's off each output (buffer) that way.
Something like a SN74LVC07A will give you about 50mA per output. roughly 10 leds per output. about 80 per ic.
you can tie all the inputs together (ic) to increase the amount of led arrays that you can run.
i would suggest using signal blocking diodes (1N4148) to prevent feedback
you can use the molex power connectors for the power, this will prevent damage to your mainboard.
If i'm over stepping the line just tell me to f off, i don't mind. I see these kinds of projects and my mind goes into overdrive.
Something like a SN74LVC07A will give you about 50mA per output. roughly 10 leds per output. about 80 per ic.
you can tie all the inputs together (ic) to increase the amount of led arrays that you can run.
i would suggest using signal blocking diodes (1N4148) to prevent feedback
you can use the molex power connectors for the power, this will prevent damage to your mainboard.
If i'm over stepping the line just tell me to f off, i don't mind. I see these kinds of projects and my mind goes into overdrive.
Nono I don't mind the feedback at all :) I was up all night myself re-calculating my current loads on this and 2 other lighting effects I'm working on. Only 1 has yet to be worked on though and the other is installed and working at desired voltage.
I was actually debating on the current levels coming off of that 4n27 last night myself. With my decision to use UV LEDs and not cold cathodes (lets be conservative here) I was debating on wither I should change my choice of coupler, or look at what your talking about. I later decided to run a separate circuit for my UV LEDs (385nm :P) and keep them continuous (not flashing) for background as they are not much for visible light. I calculated the current off the 3 flasher loops (which would be handled by the ic) and determined it to be about 50 mA. I may be over-driving the isolator a bit but I should be alright as I'm using 1% resistors.
The max output on the 4n27 is 30V (across pins 5 and 4) so I have no problem on handling 12V without combining them, just a current issue.
Definitely debatable about my choice of ic though. I'm switching nearly 4x the current as I'm inputting with 10 LEDs.
My output source is in-fact a 12V line from a 4-pin Mate n Lock power connector (Molex) (pins 5 and 4 on the IC) whereas pins 1 and 2 have nothing but the HDD Led Signal off the motherboard. I really only need about 5mA of current and 1.5 V to activate that tiny infrared LED within the IC and the blue LED for the case requires a minimum of 2.5 to even turn on (with similar current). What I have now is all I really want flashing in my case anyways as these things bring alot of reflected light in a jet black (high gloss - maintenance hell case:P). My Fans have similar high-brightness LEDs (I could get away with putting 8x3mm in each (2 per corner - big fans) so I may just luck out with 9 'pulsors', with the front(top in my case) panel indicator.
My two loops of 4 Yellow Leds (5mm) are about 2.1V@18-20mA each(200ohm resistor) and my 2 Blue ones (3mm) run at about 3.2V@10mA (560 Ohm resistor). Personally I think I'm probably over-driving the yellows a little but they should be okay as they have weird intensity peaks and I'm within the 25mA max (my blues are 30mA - their monsters) its all 22ga wire and half watt resistors so the specs are just fine :P
I'm going to split the circuits using a 3x2 header and 3 2-pin dupont/"mini-PV" connectors (motherboard headers) for ease of connecting to the ic and replacements if necessary.
I was actually debating on the current levels coming off of that 4n27 last night myself. With my decision to use UV LEDs and not cold cathodes (lets be conservative here) I was debating on wither I should change my choice of coupler, or look at what your talking about. I later decided to run a separate circuit for my UV LEDs (385nm :P) and keep them continuous (not flashing) for background as they are not much for visible light. I calculated the current off the 3 flasher loops (which would be handled by the ic) and determined it to be about 50 mA. I may be over-driving the isolator a bit but I should be alright as I'm using 1% resistors.
The max output on the 4n27 is 30V (across pins 5 and 4) so I have no problem on handling 12V without combining them, just a current issue.
Definitely debatable about my choice of ic though. I'm switching nearly 4x the current as I'm inputting with 10 LEDs.
My output source is in-fact a 12V line from a 4-pin Mate n Lock power connector (Molex) (pins 5 and 4 on the IC) whereas pins 1 and 2 have nothing but the HDD Led Signal off the motherboard. I really only need about 5mA of current and 1.5 V to activate that tiny infrared LED within the IC and the blue LED for the case requires a minimum of 2.5 to even turn on (with similar current). What I have now is all I really want flashing in my case anyways as these things bring alot of reflected light in a jet black (high gloss - maintenance hell case:P). My Fans have similar high-brightness LEDs (I could get away with putting 8x3mm in each (2 per corner - big fans) so I may just luck out with 9 'pulsors', with the front(top in my case) panel indicator.
My two loops of 4 Yellow Leds (5mm) are about 2.1V@18-20mA each(200ohm resistor) and my 2 Blue ones (3mm) run at about 3.2V@10mA (560 Ohm resistor). Personally I think I'm probably over-driving the yellows a little but they should be okay as they have weird intensity peaks and I'm within the 25mA max (my blues are 30mA - their monsters) its all 22ga wire and half watt resistors so the specs are just fine :P
I'm going to split the circuits using a 3x2 header and 3 2-pin dupont/"mini-PV" connectors (motherboard headers) for ease of connecting to the ic and replacements if necessary.
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