Here's my interpretation of Jon Grove's circuit for the relay board available on his site here . I've not given details of my printed-circuit board layout because it is specific to the particular box I used to house the camera; however I have given a layout suitable for stripboard (Veroboard) construction further down - if you're going to use it, check your layout carefully and note the points below. This version of the circuit has been built by others and works. I've incorporated a 78L05 5 volt regulator I.C. to power the 7406 rather than draw power from the 1004 on-board regulator and earthed the relay board back to the computer via the parallel port.
If you are using Veroboard for the first time, note the following:-
tracks should be cut where indicated ensuring there are no copper burrs shorting across tracks.
be careful not to bridge across tracks when soldering.
dead projects are also often caused by failing to make all the cuts or inserting components in the wrong holes, so -
check your work carefully with the circuit diagram before applying power.
and, finally, don't blame me !
Before tackling this project make sure you visit Jon's site here and read all the instructions.
For computers fitted with a WinTV USB capture board, Steve Chambers has designed an interface and relay board which links this unit to a modified 1004 camera; this is available on Steve's page here.
Jon Grove has produced a slightly different interface board to plug into his relay board shown above, allowing the camera to be used with either a PCI capture card (like WinTV GO) or the USB version. I've designed a Veroboard layout for this particular interface - shown below. Note - I haven't built this so check carefully if you are going to attempt it. You will need Jon's circuit diagram from here. You may need to type in (or copy/paste)the u.r.l if the link doesn't work - http://www.geocities.com/jgroveuk/USBInterfaceJG.gif
