Use D
Sent from cb IPhone
On Aug 1, 2013, at 1:08 PM, Jack Olson <[log in to unmask]> wrote:
> Thanks, everyone!
>
> We are revisiting our documentation requirements. We've been using "D" but
> maybe move to "DS" to conform to IPC-2612 and others
>
> -=-=-=-
>
> changing the subject:
>
> "BUS" or "BUSS"?
>
> (how can I not know this?)
>
> Jack (aka "the new guy")
>
>
> On Thu, Aug 1, 2013 at 12:33 PM, Brooks, William <
> [log in to unmask]> wrote:
>
>> DS is the correct Ref Des for a lighting device, indicating device, or
>> optical indicator or signaling device...
>> When they developed the spec we used it for a 'light bulb' or 'Lamp'
>> indicator on a front panel for example.
>> LED is not specifically called out in the spec but it functions as a
>> lighted indicator.
>>
>> That being said, a light emitting diode is also a semiconductor or
>> 'diode', which was a 'CR' or 'D' according to ANSI Y32.2.
>> I would think both are 'correct'. (D also described a vacuum tube Diode)
>>
>> 'D' for Diode takes up the least amount of space on your board... just
>> saying. :)
>>
>>
>>
>> William Brooks, CID+
>> Senior MTS (Contract)
>> 2747 Loker Ave West
>> Carlsbad, CA 92010-6603
>> 760-930-7212
>> Fax: 760.918.8332
>> Mobile: 760.216.0170
>> E-mail: [log in to unmask]
>>
>> -----Original Message-----
>> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Ben
>> Jordan
>> Sent: Thursday, August 01, 2013 10:00 AM
>> To: [log in to unmask]
>> Subject: Re: [DC] Informal Poll
>>
>> The IPC standard takes the IEEE 315-1975 as the baseline. That's the
>> earliest source I know of which clearly calls for DS.
>>
>> In the past I have used D, LD, LED.
>>
>>
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