[TriEmbed] Giving this Surface Mount Thing a Try - Transistor Help Needed

[Charles McClelland]

Glen, 

I am using EAGLE - it allows you to set the names so I guess I have to take responsibility  - Resister Base (RB)  - I am learning so if there is a better naming convention I should be using, I would be open to it.

Thanks,

Chip


On Mar 21, 2014, at 1:29 PM, Glen Smith <mrglenasmith at gmail.com> wrote:

> Charles,
> 
> As Bill said, there are single gate IC's to do what you want, a quick glance indicates the cheapest (in one'sie two'sie quantities) is $0.33. But there are 2222 transistors available in SOT-23 packages: Jameco has them here: 
> http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&freeText=2222%20sot-23&search_type=jamecoall 
> qty 10 available at $0.09 each. Or, to keep the comparison, DigiKey has them here: 
> http://www.digikey.com/product-search/en?pv7=2&FV=142c0042&k=MMBT2222A&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25 
> (for one'sie two'sie quantities) at $0.18 each.
> 
> It has been far too long since I did transistor circuit design to tell you whether what you have will do the inversion you want, but you can hook it up on a breadboard with your discrete's and see how it works.
> 
> Since I'm sending this note anyway, is there a reason why you chose RA, RB RC designations? It took me a few minutes looking at your circuit to figure out that it was a designator rather than a ResistorCapacitor (RC) network. Maybe it is just what I'm used to working with. Which layout tool are you using? KiCAD or Eagle? If one of them forces me to use RA, RB, RC - I think I will use the other.
> 
> Glen
> 
> 
> On Fri, Mar 21, 2014 at 12:46 PM, Bill Farrow <bill at arrowsreach.com> wrote:
> Charles,
> There are single logic gate ICs in surface mount which should do what you want. Here's my quick digikey search.
> 
> http://www.digikey.com/product-search/en?pv247=24&pv64=1&pv667=1&pv69=3&FV=fff40027%2Cfff8019d&k=single+gate&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
> 
> 
> Bill
> 
> 
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