Well,no day like today todo stuff that should have been made yeasterday planned a year ago..lol
Took down the old machine for a run through,and on the CV thing found out it this.(non modified xx-002 Rev D/C board on the modulator thing)
Peak+ that is the highest voltage visible on my scope.(see below for approx p-p values)
MC1377 pin 9, 4.4V
Q3 out 4.0V (this is to the minus side of cap,whatta heck??)
CSYNC(CV) out 2.3V (No load),,with 10ohm fake load I get zero based 0.5V p-p out..No load approx 1.8V p-p (plus side of cap)
So yeah,you might have stumbeled upon a real bizarre design miss by accident there?
Some speculation on that.
1. Old TV:s/monitors/etc that actually have CV used to have a own cap in the input making this miss not notable back then.
2. 'modern' scarts and the likes with CV built in tend to have a fake load on the input (like a 75 ohm or something) to emulate old inputs,the built in multichips are very high Z often(impedance).
3.Pretty few people ever use the CV output today making it a really odd one to find.
4.It takes a bit time and maybe your wire onto pin9 on MC1377 to fry up a cap for real?(dont really wanna try that out since have no proper 75 ohm load,where are my boxes with testresistors)
Anyhow,this feels like a big lovely deucy as the old STE LMC1992 thing that made the -12dB mute..Have to really recheck tomorrow again
Meanwhile,,gonna fix my CF-adapter so the card actually gets a proper reset from system..weird damn PC ? POR(power on reset crap)
Oh yeah,should maybe aswell take a picture of the oddity that makes some CF cards bug out me thinks.