PET composite video adapter
cclist at sydex.com
Mon Oct 13 11:46:01 CDT 2008
On 13 Oct 2008 at 4:08, 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.
That 2200mf is off by at least 3 orders of magnitude. 0.22 uF is
probably more like it. The 47 uF might be okay, but I suspect that
4.7 uF may also work just fine. (But I don't have your circuit, so
it's really difficult to say for certain).
It's been a long time since I wired up one of these, but ISTR that I
didn't find component values to be very critical.
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