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

[Csaba Zvekan]

Damian,

Thanks Damien, ..lol...Yeah I didn't think of that. Labeling &  
packaging of the super matched  transistors . :)
You will laugh cause I really have some barcode readers laying around  
for a couple of years now. I remember scavenging an old CD label /  
sorter factory. That's where  I got them from  .Up until now I had no  
idea what to do with them. :)
No, but seriously that transistor project  is awesome and credit goes  
for that wonderful man who designed the thing.
Also I am nothing compared to these people on the SDIY list. They are  
the real miracle makers . I am just a good copy cat :) and feel like  
information and knowledge should be free and shared. Cause at one  
point it was freely shared to me.

Csaba

On Jul 19, 2008, at 3:11 PM, cheater cheater wrote:

> 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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>>>>
>>>>
>>>
>>
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