On ceramic chips the metal cover is connected usually to a ground pin to
help shield the chip from noise. The same could be done with a plastic
chip and a strip of copper tape connected to the same pin as a ceramic chip.
On Oct 30, 2012 10:24 AM, "John Robertson" <pinball@telus.net> wrote:
> Andrew Welburn wrote:
>
>> Yes, however i have found thet the plastic versions can be a little
>> 'noisier' ie, adding spikes to vectors. This might have just been the
>> particular one or two that i have seen, but i've had to replace plastic
>> ones with cermaic to fix problems before.
>>
>> Andrew Welburn
>> http://www.andys-arcade.com
>>
>
> Could that have been poorer noise rejection requiring some extra HF bypass
> caps on the Vcc lines right at the device? As a side note, I recall IC
> sockets that had pre-soldered in caps across the power pins (7-14 or 7-16)
> back in the day...
>
> John :-#)#
>
>>
>> On 30/10/2012 05:47, Ian Eure wrote:
>>
>>> Has anyone used an AD561JN in a vector board successfully? I poked
>>> around the datasheet, and it looks like the only difference is that JN uses
>>> a plastic housing instead of the ceramic used by the JD chips. They're
>>> rated the same in every other regard, so I assume they will work the same,
>>> but I thought I'd ask to see if anyone has done it.
>>>
>>
>
> --
> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call
> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
> www.flippers.com "Old pinballers never die, they just
> flip out"
>
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Received on Tue Oct 30 11:37:38 2012
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