VBC of npn transistor in common collector mode

Yeah, I write all my manuals in Courier New, and they are bright and clear and everything lines up. Then the Powers That Be take them and reformat into Times New Roman and then they look like hell.

John

I prefer Arial/Helvetica myself, justified left AND right.

Of course I do my illustrations with the appropriate graphics program, NOT with ASCII crap ;-)

...Jim Thompson

I give my doodles to my drafting guy, and he does them in Autocad and exports gif's for figures in manuals.

I wouldn't mind learning a nice line-drawing package, if anybody can recommend one.

John

Did you download the PDF from Jims website? its very informative.

FWIW I once accidentally built an inverted CE BJT into a product - the CAD guy flipped the SOT23 (BC847 IIRC). and it still worked. the sw guy noticed something odd, which I promptly ignored (guess what - I dont do that any more. If something looks funny, I now measure the amount of funny and figure out why). 5 months later we did immunity tests, and it failed - BJT had bugger all reverse beta, and couldnt win the pissing match against a coupling clamp. so we wrote a program that analysed the PCB file, looking for flipped parts.

Cheers Terry

LOL !

I once 'flipped' an HC something or other ( bus interface ) in Orcad and forgot, and got the ins and outs the wrong way round. It must have been a transparent latch I think. That caused a few hiccups for the s/w guy but he knows his hardware too and twigged it ! Just needed one leg pulled up and a bit of patch wire to get it working perfectly of course.

Graham

hardware

get

I once designed a board with half a dozen BC548s as relay drivers. None of them worked, though we could measure a voltage drop and they did get slightly warm. It took a couple of hours to realize that they were OK, except that C and E were inverted from the normal pinout.

- YD.

The easiest one I've ever used is Ashlar's DrawingBoard, followed closely by Autodesk's Autosketch -- both less than $100. Sadly, they are both off the market, probably because they were cutting in to the pricey product sales.

I'm looking for a bonehead simple freebie that I can give out to my students who are just like you and I -- they have absolutely no interest in becoming cadastrial delineators but just need to draw boxes and circles for prototype fabrication. If you come across one, please let me know. Most of the freebies I've found are come-ons for the high priced spread and kill themselves after a short trial period.

Jim

The most intuitive drafting program I used is called Draft Choice for Windows by Trius. It is fairly primitive, but very easy to use and old shareware (now discontinued). But you can still find copies on the net: ftp://ftp.externet.hu/pub/mirror/sac/graph/dcwin2i.zip

It has all you need for simple mechanical drawings, but you can build symbol libraries to do things like schematics. I have one of these I use a lot.

It also is not shareware and expires after 30 days.

Jim

Mine didn't expire, it just scolded me for not paying for it, after 30 days. After several years, I decided I had done enough productive work with it to pay the $60 or whatever to get rid of the nag. Then they dropped support for it.

If it's gone abandonware [*] surf over to

I use it myself for instrumentation diagrams. Then export them as DXF so the autocad guy can get them into the central database.

- YD.

by

the

students

becoming

prototype

PuhLeez, do not cry until you have tried a search engine and some of the products you find that way.