Dangerous Prototypes Open Source Hardware

Stock parts for Dirty Assembly

August 21, 2016, 08:42:41 am

The next update to the parts library has parts manufacturer and type information. We'll also have a page showing the current free and stocked parts.

Stocked parts is a misnomer. Basically: everything in the catalog is stock, except chip resistors and ceramic capacitors, because we can easily buy 100pcs+ from our supplier. Chip resistors and capacitors are free if you use our preferred values, otherwise for most values you buy a reel and use as many as you want (even more than a reel, its just the setup and run around time fee). Obviously some more expensive parts like 10uF chip caps should be stock and have a per unit charge as ray pointed out in the other thread.

Currently (or shortly) these parts should be free:
Resistors: 0R, 330R,470R,1K,2K,10K,12K,100K (0402/0603/0805)
Capacitors: 18pF (?), 10nF, 100nF (0402/0603/0805) *needs better pF range for crystals

These parts are stocked, meaning no setup fees, but have a per unit cost:
Capacitors: 220nF, 470nF, 1uF, 2.2uF, 10uF (0402/0603/0805)

Any other values? Again, this is just thick film chip resistors and ceramic chip capacitors. Everything else is available by the unit.

Re: Stock parts for Dirty Assembly

Reply #1 – August 26, 2016, 03:34:44 pm

Do you by chance know the tolerances for these common passives? Doesn't matter much for decoupling and pull-up/downs but for other purposes would be nice to know what to expect. Thanks!

Re: Stock parts for Dirty Assembly

Reply #2 – August 26, 2016, 07:45:42 pm

each part has a standard tolerance. Depends on what part. Do you want to know for a particular value? We list by chemistry and +/-pF (for low range) and +/-% (for high range)

Re: Stock parts for Dirty Assembly

Reply #3 – August 28, 2016, 11:09:38 am

By the end of the week the part library should be public instead of hidden behind the invite wall.

Re: Stock parts for Dirty Assembly

Reply #4 – August 28, 2016, 04:11:59 pm

Sorry Ian, I didn't have access to the parts list at the time I asked the question, but now that I can look at it all everything I need is displayed. Thank you!

Re: Stock parts for Dirty Assembly

Reply #5 – August 30, 2016, 12:40:20 am

[quote author="ian"]Any other values?[/quote]

Some kind of low value resistor like 22R for USB inline termination (eg. https://www.arduino.cc/en/uploads/Main/ ... tic_3b.pdf).

Also, if feasible, common feedback voltage divider resistors to match a buck switch mode regulator and common voltages. eg. seeed has MP1496DJ so 40.2k, 13k (3.3V), 7.68k (5V) would be common.  These would need to be 1% so perhaps too expensive.