Easy OKR-T VV mod
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Hey, I already posted that
Whoops, so you did, my bad... too many link to follow them all
Dan
The only reason I haven't chased this option harder is because of my limited soldering skills.
I have the chip already and a big assortment of resistors. I just need the pot, the caps, and the diode.
Maybe someone will trade some soldering skills for a chip or two.
Thanks a lot guys, this has given me a lot of food for thought. I have the LM2596 pre-assembled board,
so I'll prolly do the regular VV box mod first for some practice; then move on to the VV booster tube
mod I have an idea for.
Looks good, but I would make a custom PCB for the trimmer and (SMD) resistor from the first page, less things floating around. That way I could use the thumb wheel trimmer and poke it through the cover so I could thumb up or down. Might us that on a poly tube proximity touch design I have been thinking on.
Dan
Dan
Well for one of the chips for trade I would be willing to solder it together for ya... No guarantees on it working when done however =]
I definitely will.
In my uninformed opinion, this thing is perfect except for the crappy amp rating.
Pololu S8V3A Step-Up/ Step-Down Voltage Regulator - RobotShop
See what you guys think.
That's pretty much what I did on my vv weller. I cut a piece of circuit board out of an old remote control to solder the trimmer and resistor to so I had somehting to mount it against. I did re-do it from this pic to make it a little cleaner however.
Definitely not a high enough current capacity but hopefully the manufacturer can come up with something at a reasonable price.
When I said a custom PCB I ment somthing like this, then you only have three wires to worry about
Dan
Dan
When I said a custom PCB I ment somthing like this, then you only have three wires to worry about
View attachment 40445
Dan
Gotcha...
I like to have the POT remotely locatable however. Depending on the mod body in use this would be great for those who have the ability to create a board. The last time I made one of my own was ummm many many years ago. I think I was still in high school =]
LOL I never made one until recently, all you need is a laser printer, and iron, copper board, hydrogen peroxide, and muratic acid (pool supply store). Mix the peroxide and muratic acid 50/50. Print out the circuit reverse image and iron on a copper board that you scrubbed bright with stainless steel wool. Once cooled soak in water for 10 min and rub the paper off. Then drop in the acid bath for 5-10 min and rinse with water, then solder the chips on. TADA! instant custom PCB.
Dan
I'm having a bit of trouble understanding how the process you described creates separate leads from a sheet of copper. Do you need any kind of special paper or ink? I'm guessing you would want the copper side down and drill holes for through hole components and copper up with no holes for surface mount?
Edit:
Never mind, just watched a few vids on youtube on pcb etching and it makes sense now. Ink from the printed paper covers and protects the leads and the chemicals eat away the exposed copper. Pretty cool stuff, it looks like they are using glossy photo paper for it.
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I went the other route and just finished building a CNC machine to route out the copper and drill the holes. This machine will produce .008 width and space in 2 Oz copper with ~.0004 accuracy and repeatability.
The chemicals and hassle of etching were not a problem, but drilling the .018-.037 dia holes accurately were another story.
I wonder if a plasma table could be set to a low enough temp to only burn through the copper and not the PCB. Anyway I have hacked together a couple of boards in the past free hand with a Dremel and pointed engraving bit. PITA for anything more than a couple of traces but it works. =]
I went the other route and just finished building a CNC machine to route out the copper and drill the holes. This machine will produce .008 width and space in 2 Oz copper with ~.0004 accuracy and repeatability.
The chemicals and hassle of etching were not a problem, but drilling the .018-.037 dia holes accurately were another story.
Always drill your holes prior to etching and use a center punch to lightly tap a dimple in the copper prior to drilling so your bit does not walk on you. Also you can get better accuracy drilling with a Dremel than a drill. A lot of people will tell you not to do this as the acid can get in where you drilled but I just put a tiny drip of melted wax in the holes and it works great. This also ensures your copper goes right up to the edge of your hole giving you a better solder connection.
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