Its too good to be single sided. Do you have any photograph of the board.
I designed a similar board with no frills and the schematic is given for reference. The PCB is Double Sided and this Board is only to agument Nigel Godwins tutorials on the site. I would be shortly developing support boards for this. Ideas for support boards are welcome. I already have some support boards ready for DTMF work ready.
I shall try to post a image of the board later.




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