MOTM

*I* did not buy them, the customer used the dreaded 'surplus store' in 
Silicon Valley.

Paul S.
/now understands today's meaning of 'surplus'


----- Original Message ----- 
From: "John Blacet" <blacet@...>
To: "Paul Schreiber" <synth1@...>; "MOTM List" 
<motm@yahoogroups.com>
Sent: Friday, February 27, 2009 9:24 AM
Subject: Re: [motm] Watch transistor pinouts!


> --Where did you buy these?
>
> I've never heard of this problem: same PN and package having different
> pinouts!
> That's just WRONG!
>
>
>> Hi Paul,
>>
>> Is it possible these are "counterfeit / reject" transistors that have
>> been badged
>> as 2N3904.....Seems highly unlikely there are 2 versions with
>> different pinouts.
>>
>> Graham
>>
>> On 27 Feb 2009, at 06:47, Paul Schreiber wrote:
>>
>>> I had a *long* debugging session with a customer building a MOTM-300
>>> VCO
>>> from parts. Was dead in the water (no outputs). He had previously
>>> replaced
>>> *all* op amps, the MAT-02EH and the LM319. To no avail.
>>>
>>> Them we started on the transistors. He noticed that he had 2
>>> 'batches' of
>>> 2N3904s:: 2N3904 - CJ22 and others marked 2N3904 - J04.
>>>
>>> It turns out these have *different pinouts*. It's still an "2N3904"
>>> but not
>>> the proper EBC pinout! Which is...errr...NOT per JEDEC standard (the
>>> 2N
>>> means the part is supposed to be in a registered database) but I
>>> guess no
>>> one gives a rat's ass about JEDEC, JAN-TX and all those 'old fart'
>>> transistor specs.
>>>
>>> So, *be very careful* buying 2N3904s, you want EBC pinouts. CHECK
>>> THE DATA
>>> SHEETS!
>>>
>>> Paul S.
>>>
>>>
>>>
>>
>>
>>
>
>
> -- 
> John Blacet
>
>