Digikey PB boards

Interesting - I wonder if the PCBs (2 layer) are made in the USA? I'd be inclined to try them out if they were.

John :-#)#

Yes, they say so.

They use Advanced Circuits, Royal Circuit Solution inc. QT precision Circuit, and Seeed Fusion. Probably the vendor is choose based upon the requirements.

I just wish they would offer 94V0 for quick turn, most don't. (its just a stamp on the board, if its the same mfg process)

Cheers

I have used Advanced Circuits and Seeed Fusion before. So, just let Digikey pick for me. Probably based on how my size fit in with the rest. Will try my next 2"x1.2" next. Too small for most other standard slot size of 4"x4" (100 mm^2 ).

It's a label, right? Why would you need it for prototype?

Looks like a great way to make front panels, if you don't mind the garish colour. I haven't used a 2-layer board in years, apart from the odd breakout.

Cheers

Phil Hobbs

that would be 10000mm^2 and why fuss about how it fits 100x100 when it is dirt cheap?

jlcpcb does 5x 100x100mm 2 layer with free choice of soldermask color for $2 in ~3 days

I was just scribbling an eom driver using phemts. It might work on a

I don't know what the wire-bond inductances might be for a phemt, and I'm not enough of an RF jock to work that out from s-params. I'll just TDR one soon.

I usually use 4-layer minimum boards, but the fast signals are almost always on layer 1. A thicker dielectric is appealing for speed, since it would have wider traces and probably lower losses.

Phemts are cheap and distributed amps are expensive, so it's worth a shot.

PCBs as front panels and end plates is interesting, as an alternate to machining aluminum.

We got our new anodize-blasting laser set up, which makes boxes and end plates a little easier to fab.

Yes, (100mm)^2. Many of them do prototype for $5, but $10 to $15 international shipping. 200mmx1200mm should ship for $5 to $10 in US. Off-shore takes 2 to 3 weeks, i often order updates before getting boards back to test. I asked them to dump the older boards, but they insist on sending me the junk. Shipping pre-paid of course.

• shipping?

yes, $3 if you can wait 10-18 days, $13 if you want in 2-4days

• another 3 to 4 days in the mail.

By the way, the STM32F411 black pill is great for prototype, until needing some more pins. Even with the pinned ports, there are often restrictions. For example, no A3,4 with USB or USART. No B4,5 (or something with ADC, ...) or with smaller package (QFN 48).

So, i am building a winged 100 pins DIP40:

_____XXXXXXXXX____ _____RRRRRRRRR____ _____123456789___ _____RRRRRRRRR____ _____123456789___

______100QFP______

_____________111112

Perhaps right wing only, since i have been accused as a right-winger. So, the analog signal is on Extreme Right Wing 1 (XR1).

that is 2-3 days for production and 2-4 day for shipping, I've often gotten boards with assembly in a about week

I normally either nucleo64 that includes a debugger or something like this:

I put the DIP40 (minus the middle part) on a ZIP 40 socket. Very convenient to swap. Removing the middle part also helps with the PCB layout. The wings will support another wireless (802.15.4 or .1 or just Freq. Shift Key) shuttle board.

Hmmm..

Copper Layers 2

So, stack boards instead of layers. I often stack them up to avoid multi-layers.

And looks like i have to order chips now, even before finishing the PCB, if there is any hope of getting chips this year.

Better than one!

I wonder if they have a 4-layer option.

Yes somewhere (i remember a 4 layers quick proto, but cost much more than 2x 2 layers) , I would prototype 2 pcs of 2 layers, but make 4 layers in production.

Of course, it's harder to do that for BGA. Only for simple SMT.

How do you do that? Stack boards with a jillion little wires to connect all the vias?