A recent thread about automating a coffee roaster on the TriEmbed email list motivated me to write up some notes about my coffee roasting set up and share them in the blog post below.
Starting with this month’s meeting and at each one in the future there will be a drawing in which lucky attendees can choose items from a collection such as those shown below.
Folks are invited to donate interesting items they no longer need to add to the collection for future drawings.
Next Wednesday and Thursday (each day self-contained) October 10 and 11, there will be a Design to Part (D2P) trade show. Free admission with registration at the door. 9:30am to 3pm each day. Raleigh Convention Center, 500 South Salisbury St, Raleigh, NC 27601. Details here on the Internet .
Thanks to Dan Stipe for the tip about this upcoming event.
Two events reminded me recently that you can’t have too many choices for solving a sourcing problem.
A client and I had finished a simple PCB design, got it off to OSH Park and OSH Stencils, and turned attention to the BOM. All passives but one: in my shop already, so check. The remaining one and some connectors: Digikey has them, so check mark. The central IC that is the point of the board: Digikey, zero. Mouser, zero. Other suppliers we’d heard of, zero. Anyplace in the USA, zero. China, only on breakouts. Ouch. Europe: “Rutronik”. Who? After a day of thrashing I noticed this is the chip manufacturer’s favorite distributor in Europe, and I should be able to trust them. I had to establish a business account but all was well until we got to shipping: Big ouch. And this huge minimum shipping wasn’t for Startrek teleportation beaming from their warehouse to my bench, as the fee implied. They predicted 72 hours, but later we found that was if you’re in the EU. Oh, right. When it wasn’t at my door in 72 hours I dug up an Excel spreadsheet via a well disguised link on my account page and on one row was a red “warning dot”. More digging and I decoded this warning to translate to English as ” six days estimated delivery from order date”. But the chips should be here in time for the reflow oven and all is well even if the client’s wallet is thinner than desired.
Just days later another client and I were deciding what parts of a new board really needed breadboarding to give us confidence in a major respin and this forced an immediate order of a few piddly parts (note to self: as soon as the part is on the short list for a design, order three of them.) I was inhaling to commiserate about shipping when the client reminded me that Arrow isn’t charging anything for shipping. Period. Zero, no matter what size the order is. I was startled, as this has been going on for months and I just assumed it was a one shot, short time thing and had let it fade from my memory. Instead I was able to throw the part number and quantity for a special FET I want to try out into the client’s order, smiling at the idea and my share of the shipping will be zero. Nice.
Meanwhile, the US rep for the big Euro distributor contacted me and we’ve agreed I will call her before risking another big wad on shipping that isn’t even fast in relation to the cost.
So, one arrow moved to the front of the quiver and a new one added for Euro parts that the US hasn’t discovered or that got too popular for supply here to keep up with.
Dave Jones has made a new video that shunts theory and directly demonstrates the effects of bypass capacitors. It’s worth 30 minutes to get an understanding of this that will serve you well if you’re making custom digital circuits and may wet your appetite for a deeper dive such as with Dave’s other video on the subject or section seven of chapter one of The Art of Electronics.
A whole bunch of generous folks kicked in for the triembed.org domain renewal this year and we won’t have to deal with this for a long, long time. THANK YOU!
- The Problem of the Month
- (POSTPONED UNTIL NEXT MONTH) Pete Soper: Cooperative Multi-tasking for Arduino
- Show & Tell
IWH Quadcorder 3000 – All in One Multimeter, Thermal Imager, Spectrometer, Cellphone, Digital Camera, Soil Tester, Spectrum Analyzer
Full details at TE Equipment: ONE DAY ONLY!
- The Problem of the Month
- Paul MacDougal: OSCCAL register in AVR processors
- Show & Tell