Side x Side Copper Bullet - V.V. w/ Digital Pot & Touch Switch

[breaktru]

I adapted the Digital Potentiometer for the TI PTR08100w regulator being that the reg needed a pot resistance of 200 ohms and the smallest D.P. is 10k ohms. Actually got it to work in a range of 2.05v to 5.66v
3 Bullets have been used to build it. .44 cal magnum rim for the touch sw base and two .22 cal casings to connect the caps and route wiring through.

I put in a Mosfet touch switch. Bench testing revealed that using an N-Channel Mosfet can not be used. N-Channel's break the negative circuit. Removing the negative from the PTR08100w still produces an output so the N-Channel won't work.I used a P-Channel Mosfet and it worked perfectly. Being that I am using two 18350, 1200mah's totalling 7.4v to 8.4v's and most of the Mosfet's have a Gate Threshold Voltage or 2v to 4v to fully turn on the chip, I used a 100meg ohm resistor across the Gate to Source pins and it worked perfectly. I could possibly have used a 20 meg ohm which I did not have on hand and putting two 10m in series would have taken more precious space.

This is absolutely the best working mod I have made to date and the most labor intense mod I have made.

The Physical look of the Side x Side: Inspired by Asdaq, Parallex2 and Scubatdan. Thanks guys.

Full details and Photos: Side x Side Copper Bullet - V.V. w/ Digital Pot & Touch Switch

Teaser:

 

[Para]

Nicely done; very nicely done indeed. I really like the bullet touch sensor switch. It's become your trademark

 

[drewk302]

Fantastic work as always Break. I like the size of this one, the side by side makes it nice.

 

[Eddie.Willers]

Now that, Sir, is one FINE looking piece of work!
Well done!

 

[Scubabatdan]

Great job! Hey what P-Channel Mosfet chip are you using from digikey?
Thanks
Dan

 

[breaktru]

Great job! Hey what P-Channel Mosfet chip are you using from digikey?
Thanks
Dan

I used STP12PF06 and also ordered IRF9Z20PBF but didn't use it.
I could not find any Mosfet's that had a Threshold above 5v, hence the 100 meg ohm across S & D

 

[Scubabatdan]

I used STP12PF06 and also ordered IRF9Z20PBF but didn't use it.
I could not find any Mosfet's that had a Threshold above 5v, hence the 100 meg ohm across S & D

Cool, I found my SMD mosfet for .73 cents
Digi-Key - 785-1102-1-ND (Manufacturer - AOD407)

Just an SMD kinda guy I guess
Dan

 

[breaktru]

Thanks Dan, good Mosfet for my next P-Channel mod.

 

[asdaq]

Tru, the electronics are great in there own rite, but the lines of the mod itself, even better. Nicely brazed too, I would love to hear more about the structural build, unless it's a patent thang

 

[clutchjunkie]

Nice job, I like it. Another winner from Breaktru!

I appreciate the work and effort you put into these things, but more importantly thank you for "sharing". Your work has really helped me get into this modding thing.

 

[Scubabatdan]

Thanks Dan, good Mosfet for my next P-Channel mod.

Just out curiosity, why not make your own board to attach to the PTR08100w, would be smaller with SMD, and a faster install and change out if needed. I just dislike through hole resistors and caps, to bulky.
Dan

 

[breaktru]

Tru, the electronics are great in there own rite, but the lines of the mod itself, even better. Nicely brazed too, I would love to hear more about the structural build, unless it's a patent thang

I adapted the Digital Potentiometer for the TI PTR08100w regulator being that the reg needed a pot resistance of 200 ohms and the smallest D.P. is 10k ohms. Actually got it to work in a range of 2.05v to 5.66v
3 Bullets have been used to build it. .44 cal magnum rim for the touch sw base and two .22 cal casings to connect the caps and route wiring through.

The two .22 cal bullet casings I mentioned in the above quote were cut down and I soldered (w/ torch) the brass casing to the inside of the copper caps which held very well.
In the bottom caps/casing, I routed the Neg to Pos to series the batteries.
The top caps/casing, I routed the mosfet, atty, D.P. switch and battery neg wires.
No visible solder can be seen because the solder was done inside the caps.

 

[breaktru]

Just out curiosity, why not make your own board to attach to the PTR08100w, would be smaller with SMD, and a faster install and change out if needed. I just dislike through hole resistors and caps, to bulky.
Dan

I wish Dan I was as talented and skilled as you. I haven't got in to making PCB's. I looked at the video tutorials as well as your fantastic PCB's but I'm not sure if I can pull it off.

 

[asdaq]

Ahhh, I missed in the description that the .22's are holding the caps together. I was too busy oogling the pics and thought they had a bead of solder in between and that was holding them together. I should really read more.

 

[Scubabatdan]

I wish Dan I was as talented and skilled as you. I haven't got in to making PCB's. I looked at the video tutorials as well as your fantastic PCB's but I'm not sure if I can pull it off.

If you can do the copper mod, the PCB would be a piece o CAKE! All you need is this: Pad2Pad - Custom Printed Circuit Board Manufacturer, a laser printer, iron, hydrogen peroxide, hydrocloric acid, and the copper board. I can do a video if you need a step by step...
You can DIY or you can have the pad2pad people make it for you
Dan

 

[breaktru]

Thanks again Dan, your the best. I'll leave the the custom PCB's to the man (Dan). It would make for a professional and cool build though.
Not sure if you viewed the link in OP. I placed a cut down board so the vertical through-hole parts would fit under and around the Regulator Coil for the tightest possible overall size. At least that's what I think I did. LOL.
Too bad the width spread of the reg pins don't match the PCB holes. I spread them as much as I could without snapping one off. I could have gained perhaps 3/16" in less height.

Anyway in case you did not see it, here's one photo:

 

[breaktru]

Carrying the "Side x Side"

 

[Rockproof]

Very nice work Break.

 

[asdaq]

Strapping copper tubes to your body-- definitely an eyebrow raiser

 

[breaktru]

Strapping copper tubes to your body-- definitely an eyebrow raiser

That's funny asdaq
Glad I didn't take it on Monday when I went to Jury Duty!