
This directory contains the Eagle files of the PPEP hardware.

ppep.sch	Eagle schematics	(used Eagle 3.55)
ppep.brd	Eagle board layouts	(used Eagle 3.55)
ppep-bot.ps	Postscript file representing the bottom mask
ppep-top.ps	Postscript file representing the top mask
		(the top mask is mirrored; the bottom mask is NOT mirrored)

To build the hardware, I've done the following:

  o Print the two postscript files using a good quality laser printer

  o Get a 8cm x 10cm double sided printed circuit board

  o Insulate the bottom side with the bottom mask
    (I've used the paper directly with the paper printed face on the board
     and I've used 4 mins of UV time)

    Note 2002-02-22:	I've made another double sided board using this
    same technic.  It is difficult to create the two holes at the good place
    so once the bottom side was insulated I revealed it (ie put it in the
    chemical solution).  This was possible since the top side was protected
    with something.  This way, we can see the circuit and can create the
    two holes easily.  The top side was not affected by the chemical solution.
    I insolated the top side and then revealed it.  Before revealing the top
    I protected the bottom (to avoid to have it in the chemical solution for
    too long;  but I guess it's not mandatory).  The board was 8cm x 20cm!

  o Make two holes on opposite sides of the board to be able to adjust
    the top side mask.  For example, one hole for IC5 pin 16 and one
    hole for U$6 pin 1.

  o Insulate the top side with the top mask while making sure
    the mask is adjusted on the two holes.  The Postscript file is
    such that the mask must be applied on the same manner as bottom mask
    that is the paper printed face on the board.

  o Follow the normal process to have a finished board


When soldering the board, it is important to:

  o Solder the connections between top and bottom layers.
    Since there is no iron holes (? 'trou metallises'), I took care
    to NOT use the integrated circuits holes for these connections.

  o To make these connections, I put a small thread of copper in the
    connection hole and solder on both sides.  These connections
    must be soldered before any component is put.

  o It is not necessary to solder the component on the top side.
    (sometimes this is possible but sometimes this is not possible and
     this is why the connectings holes were made to).
