--> (the ones either side of U13 (4001))> are quoted as being 1MF 16VDC You mean milliFarads I think? Don't know the circuit so can't comment on what would be OK. But that can't be right, that is huge, I'd definatly check the schematic again. NB I've never seen a cap in the millis - It must be about the same thickness as my arm!! Andy