PET composite video adapter

10000uF = 10mF, of course. And 1000uF (a very common value) = 1mF. But for some reason they're rarely written that way. I've seen values up to around 100000uF in classic computer supplies. I think you have misuderstood what I wrote. THe reason I mentioned the 1970's was that the OP believed the circuit dated from then. At that time, the use of the unit 'nF' was common in many European countries (including the UK), but was much less common in the US. I made the comment as a justification for why I didn't believe the value was a typo for nF (it was a US schematic from a time when that unit was not commonly used in the States). I made no comment as to what units were used in the UK and other countires in 2008 However, I believe it's much the same today. Certainly 'nF' is commonly used in the UK (and other European countries), I beleive it's a lot less common in the States. Another convention that's common in the UK, and I beleive other European contries, is to use the 'multiplier prefix' in place of the decimal point when writing the value. For example, rather than writing 4.7nF, you write 4n7 (the fact that it's a cpaacitor pretty much means the value will be some number of farads). 'R' is used in place of ohms, so that a 5.6ohm resistor might be specified as 5R6. 'Furlongs per fortnight', please :-) Or, of course, the infamous 'attoparsec per microfortnight', which is close to the 'inch per second' and is thus useful for measuring tape speeds :-) -tony