Homebrew PCBs

Hi all,

I have a microfiche reader that I was thinking might be used for 
inspecting PCB's 

Has anyone used one of these with a non-bottom light application  
like this ?

Any ideas for the use of the thing ?

Dave

Dave,
What a great idea!  I bet you need a lot of top lighting for it, 
though.  Those things are being blown up at least 20 to one, which cuts 
the apparent brightness 20-1, and then that has to be seen through the 
frosted glass screen, which eats even more light.
I bet a series of 10 to 20  bright white LEDs mounted on the frame, 
pointing to the focal point would provide enough illumination to over 
come the expansion losses and the screen.  3 (or 4) in series powered 
off a mains to 24V transformer with a bridge rectifier halving the V and 
doubling the +V spikes should give you what you need.  You can probably 
get along without current limiting, since the 12V is not much over the 
LED losses, and they are running at only 50% duty cycle.  I've run 
bright white LEDs at 4 volts constant at 100% duty cycle foe extended 
periods:  that's what the cheap 3x1.5V cell 1 LED pocket flashlights 
do.  Internal resistance of the batteries and current draw reduce the 
4.5V to about 4, and you can leave them on forever.
The next question is if the optics are adaptable.  I believe that if it 
focuses on a place, it does not matter much if the light is from the 
bottom or top.
Of course, all this is conjecture, as I have not tried either thing 
yet.  As I think Richard Fienman(sp?) said "Your mileage may vary".
Wait, that was the EPA, Fienman said that it's unlikely that you can 
derive actual behavior from first principals.
Richard

>Message: 9         
>   Date: Wed, 27 Oct 2004 04:12:47 -0000
>   From: "Dave Mucha" <dave_mucha@...>
>Subject: Muicrofiche reader
>
>
>Hi all,
>
>I have a microfiche reader that I was thinking might be used for 
>inspecting PCB's 
>
>Has anyone used one of these with a non-bottom light application  
>like this ?
>
>Any ideas for the use of the thing ?
>
>Dave
>  
>

On Tuesday 26 October 2004 09:12 pm, Dave Mucha wrote:
> Hi all,
> I have a microfiche reader that I was thinking might be used for
> inspecting PCB's
> Has anyone used one of these with a non-bottom light application
> like this ?
> Any ideas for the use of the thing ?
> Dave

you could strip it down to the XY stage and add one of these
http://www.jdr.com/interact/item.asp?itemno=MICROSCOPE

just an idea :)

Brian

--- In Homebrew_PCBs@yahoogroups.com, Brian Pitt <bfp@e...> wrote:
> On Tuesday 26 October 2004 09:12 pm, Dave Mucha wrote:
> > Hi all,
> > I have a microfiche reader that I was thinking might be used for
> > inspecting PCB's
> > Has anyone used one of these with a non-bottom light application
> > like this ?
> > Any ideas for the use of the thing ?
> > Dave
> 
> you could strip it down to the XY stage and add one of these
> http://www.jdr.com/interact/item.asp?itemno=MICROSCOPE
> 
> just an idea :)
> 
> Brian


Neat idea.

Seems e-bay has the body of the microscope for $9.99.  

Dave

any idea of the magnification on the lense, I remember some fiche readers had several lense's with different Mag
Thomas 

  ----- Original Message ----- 
  From: Dave Mucha 
  To: Homebrew_PCBs@yahoogroups.com 
  Sent: Friday, October 29, 2004 9:55 PM
  Subject: [Homebrew_PCBs] Re: Muicrofiche reader



  --- In Homebrew_PCBs@yahoogroups.com, Brian Pitt <bfp@e...> wrote:
  > On Tuesday 26 October 2004 09:12 pm, Dave Mucha wrote:
  > > Hi all,
  > > I have a microfiche reader that I was thinking might be used for
  > > inspecting PCB's
  > > Has anyone used one of these with a non-bottom light application
  > > like this ?
  > > Any ideas for the use of the thing ?
  > > Dave
  > 
  > you could strip it down to the XY stage and add one of these
  > http://www.jdr.com/interact/item.asp?itemno=MICROSCOPE
  > 
  > just an idea :)
  > 
  > Brian


  Neat idea.

  Seems e-bay has the body of the microscope for $9.99.  

  Dave





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[Non-text portions of this message have been removed]

That's funny...  I appropriated my kids Intel Microscope for just this
purpose.  The 10X pictures I posted several times were take with it. 
Not a bad little device but the camera is pretty noisy
(electronically).  I also use it for examining SMD parts for
orientation (try seeing the collector marks on everlight
phototransistors with anything less than 10X).

It would be really great to deep-six the software that comes with it,
though.  Aimed at the 8 year-old-on-ritilin market, I think.  Its not
desgined to get-in/get-out fast and has these annoying funky noises
when ever you do anything.  No way to turn them off that I can tell
and I always forget to turn down the sound on my PC.

--- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" <dave_mucha@y...>
wrote:

> 
> --- In Homebrew_PCBs@yahoogroups.com, Brian Pitt <bfp@e...> wrote:
> > On Tuesday 26 October 2004 09:12 pm, Dave Mucha wrote:
> > > Hi all,
> > > I have a microfiche reader that I was thinking might be used for
> > > inspecting PCB's
> > > Has anyone used one of these with a non-bottom light application
> > > like this ?
> > > Any ideas for the use of the thing ?
> > > Dave
> > 
> > you could strip it down to the XY stage and add one of these
> > http://www.jdr.com/interact/item.asp?itemno=MICROSCOPE
> > 
> > just an idea :)
> > 
> > Brian
> 
> 
> Neat idea.
> 
> Seems e-bay has the body of the microscope for $9.99.  
> 
> Dave

--- In Homebrew_PCBs@yahoogroups.com, "Phil" <phil1960us@y...> wrote:
> 
> That's funny...  I appropriated my kids Intel Microscope for just 
this
> purpose.  The 10X pictures I posted several times were take with 
it. 
> Not a bad little device but the camera is pretty noisy
> (electronically).  I also use it for examining SMD parts for
> orientation (try seeing the collector marks on everlight
> phototransistors with anything less than 10X).
> 
> It would be really great to deep-six the software that comes with 
it,
> though.  Aimed at the 8 year-old-on-ritilin market, I think.  Its 
not
> desgined to get-in/get-out fast and has these annoying funky noises
> when ever you do anything.  No way to turn them off that I can tell
> and I always forget to turn down the sound on my PC.

Speakers ?

Mine are still in the box.  

I don't need my puter to talk to me, I talk to myself enough already !