PAW3 - NU-SockiSop

[matseng]

As mentioned in an earlier post I'll try to do one small PCB project every week and then send for PCB's of it every Monday.

#2 was a bit late due to xmas and whatnot, but this project is so much simpler that I'm convinced that I'll be able to submit it Monday.

The PAW 3 is a "super-duper-multiple-dualsided" breakout board. Each PCB currently have 4 copies each of 6 different designs (3 designs on each side). So there's a total of 12 breakout boards with two designs each on a 5x5cm PCB.

Sub-board 1 - A SOIC-16 is sharing the board with a TSSOP-16 on the back. This board also have space to put decoupling caps and LEDs/resistors on it.

Sub-board 2 - A SOIC-8 is shared with a TSSOP-8 on the back.

Sub-board 3 - A SOT-23-6 (small 6 pin device) is shared with 2 pcs of SOT-23 (like a transistor) on the back.

The boards will be done on a 0.8 mm pcb with "cutting grooves" made of 0.25mm wide rectangles of tStop/bStop for easier cutting with a box knife.

Any comments and/or suggestions is welcome before Monday when the order will be sent to Seeed.

[sqkybeaver]

these will be a hit, every time i get a few boards like this there all populated before the night is over.

[honken]

You got your logo wrong "SLR" in the 8 pin device...

[systemstech]

Oh man it's only the third design and he already can't see straight. I say lets place bets on how long before he stops. LOL

[blarson]

No SOT89-5 . Oh well, I need to do my own board for a PT4115E LED driver.

[Sparks]

How about replacing one of the SOT23 pcbs with LGA14? Some accelerometers and other sensors use this.

[matseng]

Sqkybeaver: It will be hard to get cheaper breakoutboards. At 11 cents each inclusive shipping they're an absolute steal.

Honken: Aaargh... Not again! It seems like my fingers like to type SLR instead of SRL - I even have some parts in my eagle lib that I've misspelled this way.

Blarson: I'll most likely do one more board like this with other pinouts soon - I'll make sure to include the SOT89-5 then.

Sparks: I'll see if I can do that, but the 14 pins of a LGA14 won't fit there without some rearranging. Probably it will be on the next superbreakout board.

Systemstech: You're evil! I'll kick you in your Mojito drinking butt the next time I see you... :-)

[nickjohnson]

Very nice. Some places will do V-Score, which would make separating the boards a lot easier.

[MickM]

nickjohnson;
I use a paper cutter (guilotine), works fine.

Mick M

[systemstech]

@MickM;

I use a paper cutter (guilotine), works fine.
Mick M

What brand and size paper cutter do you use? Are the blades replaceable?

[matseng]

Adafruit says that a (low cost) $125 pcb cutter doesn't handle FR4, but it looks sturdy enough to me. Maybe the blades will go dull in zero time... http://www.ladyada.net/library/equipt/ (scroll down to Bench Tools)

[systemstech]

I've used a scroll saw and a wet saw and haven't had any issues other than the Kerf(Width of the saw cut) size. But if I leave a 3mm gap between boards it's not an issue.

[matseng]

I would like a 0.5mm thin diamond coated blade on a small table saw... That would be nice. But for the time being I stick to 0.8 mm pcb that can be separated by hand after a quick scratch with a box cutter on each side.

[MickM]

Hi systemstech ;
It's just a cheap one.
Photo attached.
I just press down very firmly so that the pcb doesn't squirm away.
It's about 10" square, I bought it used to experiment with.

Mick M

[systemstech]

The quickest at cutting is the wet saw and dust free. I'am still looking for a fast way of making the corners on the boards.