Even better, have your stencil vendor etch templates from 10 mil foil.
They are much more durable and can be etched with polarity markings and
nomenclature. When having done these previously, the only caution was to
bevel the outer four corners at a 45 degree angle so there's no sharp
points during handling.

Mike McMonagle
K*Tec Electronics
(281) 243-5639

> -----Original Message-----
> From: Bill Fabry [SMTP:[log in to unmask]]
> Sent: Thursday, August 06, 1998 10:56 AM
> To:   [log in to unmask]
> Subject:      Re: [TN] <no subject>
>
> Rich:
>
> Try creating plastic overlay templates with cut-outs for each of the
> tantalum
> caps on the board, with the polarity clearly marked on the template.
> You could
> create the templates by printing an edited 1-1 assembly drawing image
> onto
> transparancy film on your laser printer and cutting out the locations
> for the
> capacitors to be checked.
>
> Granted, it adds an additional inspection step in the process but it
> does detect
> installation errors before applying power to the board.
>
> Bill Fabry
> Plantronics, Inc.
> [log in to unmask]
> ____________________Reply Separator____________________
> Subject:    <no subject>
> Author: "TechNet E-Mail Forum." <[log in to unmask]>
> Date:       8/6/98 8:24 AM
>
>      Hello,
>
>      I am interested in a solution to installing tantalums in
> reversed.
>      Plus symbols, silk-screen marking, etc. have proven inadequate.
>      Failures come after many hours of reverse polarity in some
>      applications.
>
>      Are there any ideas on how to physically or otherwise prevent
> this.
>
>      Thank you, Rich.
>
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