[Hello there and thankyou very much for the reply to my question but can you please confirm that the diodes D1 to D4 are connected to pin 15 via the R3 resistor exactly as shown in the schematic diagram can anyone help resolve this question ? as I am up the creek without a paddle becuase the diagram does not look right somehow I need to know the answer to my question before I can attempt to biuld this project ???