when it comes to electranics i'm as far removed from a sparky as you could possibly get so i don't really know how to alter Macro's circuit for Power and HD...but here's what i wanna do. Power LED on til there's HD activity then the Power LED goes off and the HD LED comes on...i've tried Macro's circuit but it don't work for me...maybe cos i'm only using 2 LEDS? Isaac (I think) mention logic gates in a previous post, any chance we can have a diagram or tell me how to alter Macro's circuit to make it work? Or can you give me the Maplin code for the thing i want so i can have a look at it and figure out what i gotta do? Pretty please with sugar on top it'll be cool if someone can help me cos i got a bling blinging idea for me case! ai!
I found this in my image archive, maybe will get you through until I finish a full writeup: Edit: I just realized there's no label--the part shown is an optoisolator, such as a 4N25 as specified in macro's HDD LED mod To evaluate R you'd just do the customary (Vs - Vf) / I but account for the fact that the collector-emitter junction will drop around 0.2V, so R = (Vs - Vf - 0.2) / I
Nice, Linear, is that your handwriting? You neeeeeeeeeeeeeeeed to get a OrCAD eval disc, you get a free circut drawing program! If you buy the real thing, you can even check your work, and make sure you won't fry that realy expencive part. I think the address is http://www.orcad.com, cool stuff, if ya ask me! Signing out...
Hey, I was thinking about writing something to see if there was interest in a circuit like this on VH's boards but in the process of checking to see if its been done before I came across here. Almost a year ago now, there was a post on The Hardware Corner 's forums where kitty showed a circuit where the clock generator is advanced by the variable output of the HD pin on the mobo. This post is also mentioned here although that mod shown looks like its constantly roving. Since then, looks like THC forums are dead and they haven't archived anything. Most references I see to a "Knight Rider" design are constantly on and not just activated by the HD. This design uses 2 ICs to regulate the pattern of the LED and also varies its speed. It connects to the PSU so the circuit doesn't dim out as soon as the HD activity stops. The only thing I have left is a printout of the diagram and the actualy project. It *did* work until the connections fell apart (I'm a soldering n00b!). It looked damn cool. Before I thought that if I was re-doing it I might as well do a writeup, but if linear is midway, I don't know if thats necessary. If you need any help linear, just hollar! Here are the pictures: Thoughts? -Dave
Also, Found a similar article here: http://hw.metku.net/vilkkuvalot2/index_eng.html Looking back, I didn't use an optoisolator! I only shorted once, which resulted in my computer turning off. Scared that Sh!t out of me, but I was sure happen when it turned on again Such are the risks of the modder... -Dave
Always be careful!! You don't want to kill your computer! I've not done anything so dirastic, but I have started an electrical fire inside a floppy drive
