DualParaMos-555PWM v1.0 pcb

[david4500]

Hey fellas! Glad to see some activity around here, I've been lurking the whole time... hoping some new posts would pop up. People making there own mods is slowing down at the moment? Everyone happy with the stuff from China? Not sure what been going on... but I've been working on plenty of projects the whole time.

Newest personal PWM board design:



Mounts for screws/standoffs for M2.5, clicky tact fire switch (there is a secondary 6.2x6.2mm footprint underneath there if wanting to use a tact like the DNA and SX boards use, LED when firing, 4 position rotary switch for frequency selection (selects different value capacitors), MIC1557 timer, 5v LDO to power a 50K digipot, tact up/downs, 12v boost board from Pololu for nfet gate drive when slide switch is turned on, when switched to off the 12v boost board gets powered by USB and goes to a 2S charging IC.

https://www.pololu.com/product/2117

First 4 layer board designed. Hoping everything works as planned, have components and boards on order from Oshpark. Excited to get one assembled and tested.

[Visus]

Ya David China upped their game huge and now even DNA 200's are inexpensive.

Most were drawn to mod  for a more powerful vape and now its common to have over 50watts dependable even in a little cheap mod; it costing 16 bucks is 50 watts now..

Pbusrado has given thumbs up to a whole host of mods operating as advertised..

I still love to build myself and are on fb smart pwm page among many other modding pages and none of those pages have new post since dec-jan 16'..   Smart pwm is very active everyone is loving the board and Mark just keeps making it better..

It was awesome to have the most powerful mods in the beginning of vaping mods but now yep cheap and accessible for everyone..
I've yet to buy a consumer mod but --- those new mini mods are so freakin cute and ~75watts w TC lol..

[david4500]

Really enjoying the digipot & 2S USB charging

[MonkeyTokes]

Really enjoying the digipot & 2S USB charging

I bet you are!
Have you heard of the BQ29209? I don't really trust on board charging, I much rather use my actual balancing charger or swap batteries with 18650 mods, but someone testing one of my boards mentioned it to me

[david4500]

I'm using an MCP73213. It doesn't balance, so the IC you mentioned (thanks) might be nice to pair with it.

I haven't had any issue with the charging circuit (so far). I'll vape for a while when I get home from work, plug into USB at the end of the night and have been checking the batteries with a multimeter in the morning. They are both at 4.19v.

[david4500]

Just the 2S charge board

[SDaddy]

Yes!  Just what I need!!   

Just the 2S charge board

[david4500]

I posted some more info on it on reddit: https://www.reddit.com/r/OpenPV/comments/4yy4pp/2s_usb_charge_board/

[Visus]

David  I read your reddit and went over the chips datasheet
There's literally 100's of chips/samples on Ti that will do so much more in same/similar package.

Temp/charge monitoring, balance, and charge at ~2A+,  2s-6s,  etc etc.

Not to be quaint but ya could have just used a usb port and a 8.4v wall wart charger but what fun would that be..

Too lazy now,  but ya I had a chip that was awesome lined up,  but no, did not care to do since I like the perhaps "safer"  can I charge in with parallel chips at 1.2A..

That is sweetness tho nice work...

[david4500]

Suits my needs pretty well at the moment. Can plug into my computer or phone charger and like magic, it's charged in the morning.

I'm not the brightest bulb and TI's data sheet usually make my head spin. Some of the other smarter PCB guys will probably come up with something more capable soon.

What IC were you planning on using?

[Visus]

I love Ti's datasheets lol
They are what I started to learn from so I guess that's why lol.


I dun remember but it was sweetness with computer monitoring, 2s-6s chip, adjustable up to 6A
it was relatively common on search..

Mine was not for box internal but for a stand alone unit..

But they do have numerous cell phone/notebooks chips that are amazing and up to 2A+ charge
Very cheap too..

http://www.ti.com/lsds/ti/power-management/battery-charger-ic-overview.page?keyMatch=charger&tisearch=Search-EN-Everything
http://www.ti.com/lsds/ti/power-management/battery-charger-ic-products.page#p1152=1;1&p338=Li-Ion/Li-Polymer&p1153max=1;2.5&p1686=Switching Charger
http://www.ti.com/lsds/ti/power-management/battery-charger-ic-products.page#p1341=SMBus

[david4500]

[david4500]

[Visus]

Wow thats beautiful David
What's going on with R1 tho?

[david4500]

I didn't do everything correct when designing the board. Had to omit components and bridge pads with wire or zero ohm jumpers to get it functional. Haven't had the time to revise the schematic & pcb design.

R1 is an omitted pullup for the N1 nfet, a zero ohm jumper connects the source and drain instead.

Similar tings going on on the back of board as well.

[Iam Uprise]

my 555 timers have a line across the top no indent or little circle in the corner. what direction do i place my 555 on a pcb?

[Breaktru]

my 555 timers have a line across the top no indent or little circle in the corner. what direction do i place my 555 on a pcb?

What's the part number and manufacturer? You will need to lookup the Datasheet for the pin configuration.