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June 29, 2013
Product WRL-11786 |
about 8 months ago
i got it working, sweet, and my code is there too. (under RN41)
Product COM-00526 |
about 8 months ago
one more. the 78xx was created in the dark ages. and has nothing at all to do with the above part.
It was invented by Robert C. Dobkin and Robert J. Widlar in 1970 while they worked at National Semiconductor.
43 years ago, my hay day. the above is 2004 creation, the original engineers are dead or retired. now. RIP if latter.
dont feel bad, i burned my hand on a 78xx , in 1970, wired wrong, there is no protection diode on the 78. sorry.
that same protection diode above, blows up your 3v parts, with supply minus 0.7v (protects reg, but not load , sorry)
one other warning, the tab and back side. are connected to the ground tab i think?, so be careful where it touches.
notice they forgot to say. on bipolar transistors its usually the Collector,
the packaging engineer said “the frame photos dont have pins ID’d because, "we put different die, in this package” so its a pure package drawing only. That is the excuse and a contradiction, in semi business..
I thank LD is STI only prefix. best post, RTM. sure.. but better, is RTMFM, (the F is formulated), as in coded……
yes, page 2 is clear,, if you know conventions. even old NS and Fairchild in 70s did this…
but most makers do poor spec pages, IMO, 50 years now.
the good ones, use quasi 3d views. isometric so you can clearly see what side is in view.
but the PDF above is TOP view , plastic side.
like above photo view 1, see that, 3D effect too bad you dont put a 1 on the left there….helping others to read Data sheets.
same with the mech. drawing, missing the pin numbers, strike 2.
i asked our marketing, why this is done, (I worked at Phillips semi)
answer. to make it look like or competitors. they were ghastly afraid of looking different. (pure fear)
reason being, so as not to scare away costumers. so, its a tradition , this method, of poor pinout view.
I can tell you there are worse drawings,
what i do,if even slightly not sure, i power it up , by self and check it. take 1min with a bench variable supply or if poor, a 9vdc transistor battery (smoke alarm bat).. You could loose it all, its only the regulator .. LOL
the TO-220 CASE moniker is lacking. the TO-220 is a base family of parts and has many version. and is a JEDEC standard , since even my younger days in 1970s. the codes vary MAKER TOO. never assume one co. uses same package codes. ever. and WIN.
this applies to transistors in spades. too. look up TO92 and see 3 forms.
so when buying parts, get the data sheet and see what suffix your brand uses, for the TO-220. case.
and yes, spark fun fogot to say which case it is, I suspect they forgot or just dont know cases too well.
now go to mouser, a real distributor. and see how the sell parts. at 55 cents each qty 1.
the photo shows STI maker. and they only make 1 , 220 type.
the STI data sheet shows.
1 gnd, 2 out, 3 in , left to right leads towards you.
is yours STI? you never said.
Product WRL-10559 |
about 8 months ago
let someone else reflow it. or lay it out better (see a base board only, let me solder it., can be done easy with a extra tiny pencil iron, just did one so have proof)
here it is for $29
$4 for the base board
mouser is a full wholesale distr. and sells by quantity discounts, as do most wholesalers.
the data sheet is clear see second bullet !, it states. “Backwards-compatible with Bluetooth version 2.0, 1.2, and 1.1 ”
read the real data sheets and the real full PDF, this module is far better than any HC05 sold, and 1000 time better docs and support.
I wish now that i didn’t waste my time on CSR parts (HC05)
using three?, of these. the pdf above shows. only 1 master talking to 1 slave. RTM.
my wish,why not make sell this module mounted, to a base board, with header pins so we can connect to it.
those castellated pins are very hard to use. unless doing a custom PCB SMT layout.
If I missed a base board, please post that.
No public wish lists :(