[sdiy] Transistor matching Was: Another satisfied Takuya Katayama Tempco customer.

[cheater cheater]

Csaba,
I assume it would also have to label each part that's being matched to
keep an inventory. Some sort of barcode system, presumably. So, you'd
need a barcode reader in there as well.
All your projects seem pretty cool :) I'm quite impressed. And if you
do make an automated matching facility, make sure to let us know :D

Cheers
Damian

On 7/18/08, Csaba Zvekan <czvekan at gmail.com> wrote:
> Ohh that's no problem I also thought of that as well . :) ...lol...
>
>  see my DIY CNC/ SMD pick and place project :
>
>  http://www.youtube.com/watch?v=hOVnKK6m5a4
>
>  ...lol..
>
>
>  Just kidding it just mills and drills ... could be modified  though :)
>
>  Csaba
>
>
>
>  On Jul 18, 2008, at 10:00 PM, cheater cheater wrote:
>
>
> > The only thing we need now is to come up with a robotic arm to load
> > transistors from SMD mounting tape, then we can run&forget for two
> > weeks and have a very nicely matched bulk of transistors. :)
> > I assume this is what companies normally use to match them?
> >
> > Cheers
> > Damian
> >
> > On 7/18/08, Csaba Zvekan <czvekan at gmail.com> wrote:
> >
> > > Ian ,
> > >
> > > I am by now means an electronic guru . And can not answer your question.
> > > All I know is that I have matched some transistors (BC547) for a VCO
> project
> > > (Yves VCO Yusynths
> > > http://yusynth.net/Modular/EN/VCO/index.html
> > > and compared with the LM394 SuperMatched Pair) . And find no noticeable
> > > difference in temperature drift or anything.
> > > The only difference is the price  compare for yourself LM394 is 22.35$
> and
> > > two BC547 is 0.20$ . Ok you would still need to purchase a bunch to
> compared
> > > them. But you get the idea.
> > > All though I must say that the precision OP-AMP OP490  is rather
> expensive
> > > ( 15.70$ @ farnell.com )  :( but hey , we want precision, right ? And
> it's
> > > not like we need to buy hundred of them. The rest of the project is
> rather
> > > cheap .
> > > Make sure you handle measuring in the morning and touch the transistors
> > > with tweezers. Also give it some minutes to settle . You 'll get the
> hang of
> > > it.
> > > The original design I got from here:
> > >
> > >
> http://electronicdesign.com/Articles/Index.cfm?AD=1&AD=1&ArticleID=6251
> > >
> > > Csaba
> > >
> > >
> > >
> > >
> > > On Jul 18, 2008, at 4:24 PM, Ian Fritz wrote:
> > >
> > >
> > >
> > > > At 05:29 AM 7/18/2008, Csaba Zvekan wrote:
> > > >
> > > >
> > > > > We SDIY people always need matched transistor pairs :
> > > > >
> > > > > that's why I recommend this:
> > > > >
> > > > >
> > > > >
> > > >
> > >
> http://www.csaba.ch/index.php?option=com_content&task=view&id=14&Itemid=30
> > >
> > > >
> > > > >
> > > > >
> > > >
> > > > Is there some advantage of this over a simple bridge circuit?  How
> > > >
> > > precisely can you measure the matching?
> > >
> > > >
> > > > Ian
> > > >
> > > >
> > >
> > > _______________________________________________
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> > > Synth-diy at dropmix.xs4all.nl
> > > http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
> > >
> > >
> >
>
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