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Something like this? Theres a few been designedhttps://www.oshpark.com/shared_projects/rn413IO3
Are you guys just tying all your GND lines together or actually attaching them to something?
Not sure exactly what your asking, but typically with PCBs and grounds you use a "ground plane". In your PCB design software you should be doing a copper fill on the bottom to serve as ground and run your circuit traces on the top side. Any ground connections you need for components on top should connect to the ground plane through a via. You usually can't avoid a few traces cut into the ground plane, but it's best to avoid that as much as possible. The more solid the ground plane the better.Ground planes are important for reducing electrical noise and it also makes it more convenient to route your component connections. Ground connections are the most common ones and they can be picked up from a ground plane easily with a via or array of vias for high current connections.With home made PCBs doing two sided boards with vias can be rather involved. It's possible, but not really worth the effort when you can get them fabbed for cheap from places like Osh Park. For a home made single sided board you can use a copper fill to act as your ground plane. Doesn't work all that well since you have to cut it up pretty heavily to route component connections. It's much better to use a ground plane with a two sided board.
I ran through this last week - started this thread with some pics.Ehttp://www.reddit.com/r/OpenPV/comments/32pwu2/ground_wire_bundles_okl_t20/
He is me, and in that instance, the ground circuit is tied to the box through the atty - just like most of these boxes.
It depends on where and how your parts lay.I would run a heavy gauge gnd wire from the battery (-) to which ever is closer, the 510 or Pin 4 on the board. If the 510 is closer than from 510 to pin 4 or vice versa. All the rest of the gnd connections are light gauge and can be connected to the nearest ground point as mentioned above.Keep wiring as short as possible. Go for the shortest run.
The other ground points can be connected to the nearest heavy gauge point. They don't all have to be connected to the same point. You can use the closes 510, pin 4 or the batt (-) for the neg light gauge points. Each can be at a different heavy gauge connection.
I thought I would share really quick on how I wire up the OKL. It really helps me to make it compact and clean. I solder the mosfet legs directly to the chip like so. It makes for a rather thin build. I just strap the fuses to the top and away we go. You cant really see it but the drain leg is folded upwards and I have it folded over and soldered to one side of my fuses.Hope this helps...Sam
I thought I would share really quick on how I wire up the OKL. It really helps me to make it compact and clean. I solder the mosfet legs directly to the chip like so. It makes for a rather thin build. I just strap the fuses to the top and away we go. You cant really see it but the drain leg is folded upwards and I have it folded over and soldered to one side of my fuses.Sam
Going to try this one myself here. Question though: Is it ok to use the n-fet posted without the zener diode? As in as just using it as the switch activator?
Wow! I was reading this thread a year ago, can't believe it's still alive. You guys are awesome.I just have a few questions1. What happened to mamumods.com/forum !!?2. Input caps! I have this feeling in the back of my head that I read the answer somewhere in here, but ctrl f 'caps' on every page brought no answers ... What gauge wire is recommended for the output caps? 20? Now that summer is here (again) I'm here to finish my 1590g okl t20 box! cheers
Yes, is ok - the zener is not required for the circuit to work correctly.
EDIT: Aaaaaaand I'm an idiot. I have the negative version. Had the positive before, thought it didnt work, used the negative version that I bought a few months ago thinking it was another positive version. Time to wire this baby up for reals.
Problem: My Vo range is abnormally high, 6.05V-7.xx.Would a 200Ohm pot cause the voltage range to run that high?
Yes 200 ohm pot is too low. Also your fixed resistor is either too low or not wired in correctly.Hint: The lower the ohmage the higher the output voltage and visa versa.
Great. Good to hear it's working now.