-
Classic now available in Blue - PCB from PCBWay
03/17/2019 at 02:04 • 0 comments -
Operation without battery​
02/05/2019 at 01:28 • 0 commentsHere is the (quasi) constant current circuit for operation of the 'You Are Here' pin without battery.
The current is mainly set through resistor R4 and calculated through:
The current is not absolutely constant. A small term is added to the overall current through the LED.
The switch input through J1 is not tested yet, the series resistor R2 might need to be lowered to turn the LED off, when driving the input low.
-
Modern PCB from JLCPCB
12/29/2018 at 02:37 • 0 commentsJLCPCB offered me to test their PCB service, so here we go. The test subject will be my 2nd installment of my artistic PCB theme named 'You Are Here'. This time a modern take on a location pin that shows up on many location features all over our modern life. Quoting and ordering through the JLC web interface is as painless a it gets. You upload a Gerber zip archive, pick your PCB parameters and get an instant price including shipping and an estimated delivery time. It starts at less than 3.00CAD for green boards 10cm x 10cm in standard 1.6mm thickness. My board was slightly more expensive as I opted for red soldermask and leadfree HASL finish, cause the boards might become my second batch of pins to be sold on Tindie.
The quality is excellent, all features came out exactly as I had them designed. The PCB layers are aligned perfectly, no overlapping of soldermask or silkscreen onto the pads.
Silkscreen resolution is adequate, the rastering only starts showing up slightly on angled lines.
Everything was very good to be soldered, even with the lead free HASL finish, I just increased the temperature of the iron by ~30 deg.
One very special feature that JLC is offering, is the location selection of the serial number that they are printing on the board during manufacturing. If you put a text string called 'JLCJLCJLCJLC' on the desired location on the board, they are going to use it for the serial number. This guarantees visible features to be not altered at all. It is even possible to put this string under a component body and then it will not be visible at all. This is especially helpful for artistic PCBs that should have at least 1 side exactly as designed.
Shipping through DHL was without any problems, the boards arrived from China to Canada in 7 days after the order was placed.
-
Classic PCB from Seeed Studio
12/26/2018 at 17:30 • 0 commentsI got the opportunity to order PCBs from Seeed Studio through their Fusion PCB service. As you can see from the pictures it is a more artistic than complicated PCB and the quality is outstanding. I designed the board with relaxed spec of 7/7mil trace width/spacing and 0.3mm hole size, which fit perfectly in the most price competitive option. Registration of all layers, including soldermask and silkscreen is excellent, everything is centered and no unwanted overlapping onto the pads. Also the PCB outline is routed all the way around and the break-off tabs are not noticeable at all.
Also the silkscreen resolution really good, virtually no steps are visible on angled or curved lines, which makes it very usable for advanced graphics.
I opted for shipping through DHL which took 4 days from China to Canada to the local depot, and another 4 days for the local contractor to deliver because they ignored my instruction for pickup at the depot. This is not controllable by anybody at the shipping or receiving end, so it was just bad luck for me. Other shipping options are available.