THE CIRCUIT OF THE RELAY BOARD AND THE USB INTERFACE BOARD

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 - I've not built this version, so if you're going to use it, check the layout first !. 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 visitJon'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 fromhere. You may need to type in (or copy/paste)the u.r.l if the link doesn't work - http://www.oocities.org/jgroveuk/USBInterfaceJG.gif

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