13 Oct
2008
13 Oct
'08
12:23 a.m.
On 13/10/2008 05:08, Ethan Dicks wrote:
The schematic shows the horizontal sync coupled to a
gate via a "2200 mf"
non-polarized cap. I don't know that I have any disc or ceramic caps that
large lying around. The output of that gate (which NORs the inverted
vertical sync with the massaged horizontal sync) feeds unto a "47mf"
tantalum cap (then pulled down to ground by a diode, and wire-ored to
inverted video out/composite out via a 470 Ohm resistor). I have 47uF caps,
but that seems pretty large to me.
I'm not familiar with that circuit, but I wonder if the scan or JPG has
made an 'n' look like an 'm' and turned 2200nf into 2200mf? 2.2mfd (ie
2.2uF) is not uncommon for a non-polarised cap, being used in some
telephone circuits. On the other hand, 47uF is more reasonable than
47nF for a tantalum.
--
Pete Peter Turnbull
Network Manager
University of York