So you chose to make that one rather than Alaine version ( http://www.picbasic.co.uk/forum/atta...8&d=1169308729 )

I use RS components here in the UK and they don't list 390nF value. I'm sure for your purpose a 400nf capacitor would suit. Likewise a 5K trim pot could be used, but you may not need to use all the range to get the 1ms - 2ms pulse width.