13 Oct
2008
13 Oct
'08
12:26 p.m.
On Mon, Oct 13, 2008 at 08:21:11PM +0100, Phill Harvey-Smith wrote:
That would explain why my schematic doesn't have it, then.
Ah. Thanks much for that. I have plenty of small PCB pots... easy to
fit on in.
-ethan
--
Ethan Dicks, A-333-S Current South Pole Weather at 13-Oct-2008 at 19:20 Z
South Pole Station
PSC 468 Box 400 Temp -54.8 F (-48.2 C) Windchill -82.7 F (-63.7 C)
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Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html
Ethan Dicks wrote:
That is very likely, though I probably found a copy of just the
diagram somewhere on the web. I have a copy of the book at home,
but I didn't bring it with me.
P.S. - I found another type of composite circuit
using a CD4011 as an
inverter and a CD4066 to mix the signals,
Sounds like the circuit I have here from "The PET Revealed". but for
some reason I don't
have all the components labelled on my drawing - the cap on hsync in
particular.
It's not labeled on the diagram in the book, nor does the text say what
value it is. One
interesting variation with that one is that the 'LS02
circuit has a 1.5K pulldown on hsync between the cap and the gate,
while the CD4011/CD4066 circuit has a 10K pot. How much adjustment on
hsync is likely to be needed between the PET and the first gate of the
composite circuit?
The text in the book says "You may encounter problems with the
horizontal hold, but these can usually be cured by adjusting R1", and
goes on to speak of low quality monitors or converted TVs...