[sdiy] 2n3904 transistor matching stats

[Michael E Caloroso]

Hfe and other parameters can't be controlled during the fabrication
process.  There is no way that a series on the same tape will be
matched.

MC

On 6/7/16, Pete Hartman <pete.hartman at gmail.com> wrote:
> I haven't noticed, but I haven't done rigorous checking either
> On Jun 7, 2016 4:18 PM, "Mike Beauchamp" <list at mikebeauchamp.com> wrote:
>
>> On 06/07/2016 07:12 PM, Pete Hartman wrote:
>>
>>> I've found that transistors on a tape almost always have very close
>>> matching between adjacent devices.  To the point where I only bother to
>>> check if I have some other reason to want them to be extra precise (e.g.
>>> If I'm building for someone other than myself)
>>>
>>
>> Did you ever notice any that weren't matched?
>>
>> These were just ordered in a loose bag, so maybe the outliers were from a
>> different manufacturing run.
>>
>> Mike
>>
>