17 Nov
2007
17 Nov
'07
6:46 p.m.
On 17 Nov 2007 at 10:22, Gordon JC Pearce wrote:
It can also be done with a 74LS06 OC inverter and a few resistors. A
fancy version might use a '221 one shot to adjust sync pulse position
and width. I think the one I used to drive an RGB monitor with SOG
From memory,
and it was a while ago, we had three voltage dividers to
knock the TTL outputs down
to .7v, and then three more resistors from
the intensity bit to the analogue outputs.
There may have been some diodes there.
The sync combiner was a couple of resistors and a transistor. from a VGA output used a 74HC86 XOR and was
self-powered.
Cheers,
Chuck