If the output is printed onto drafting film or clear acetate it can be used as a full size artwork for UV exposure onto etch-resist coated PCBs.
Updated 12-4-2003
Back to Analyser Page
Parts list
Assembly
The board:
For the PCB artwork, if you have access to a HP LASERjet or compatible printer (not ink/bubblejet), there are two files on my webspace, one is for a single board (8KB), the other is for four boards on one 100x160mm eurocard (32KB). These are zipped HP print files and can be downloaded from:
All that's needed is to unzip the file and (using the DOS Copy /b command) send it direct to a HP LASERjet printer i.e. "copy analyser.L10 Lpt /b" (omitting the quotes)
If the output is printed onto drafting film or clear acetate it can be used as a full size artwork for UV exposure onto etch-resist coated PCBs.
The final dimensions of the board are shown here, be careful not to cut it too small or it won't be retained by the grooves in the box.
The taper on the sides of the board are so it slides into and is supported by the channels within the case. The chamfers at the top allow the lid to fit properly.
For those without access to a LASERjet printer who may want to use an etch resist pen to create the board, an image of the copper side of the p.c.b. is shown below. The component holes are based on a 0.1" (2.54mm) pitch.
Component layout:
Be careful to observe the polarity of the diodes, the capacitors if electrolytics are used and the orientation of the transistors and U1. Be aware that the diagram below is based on Q1 & Q2 being 2N7000 transistors: Alternative devices may have different pin-outs (i.e. if you use say BS170's, they'll have to be rotated 180 degrees as the drain and source are reversed on this device).
Below are shown views of the pinouts of the two varieties of diode as well as the pinouts of 2N7000 and BS170 transistors (viwed from the bottom).
And finally, the finished board.
Assembly
Parts list
Back to Analyser Page
Contact: Dave Cordes.
www.dcordes.freeuk.com/o2board.htm