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Old 10th Jun 2006, 12:24 pm   #6
oldeurope
Retired Dormant Member
 
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Join Date: Dec 2003
Location: Solingen, Germany
Posts: 727
Default Re: FOTH RGB combiner problems

"Give me op-amps and nice complex IC's, please"

Replace Q8 Q11 by an TTL to RS232 IC

"D1 is there to allow me to set either sync tips at 0V or black level at 0V by adjusting R20. Odd idea I've never seen used anywhere else before, but it seemed to work so I left it."

Sorry I didn't see the -5V rail. With +-5V it makes sense to me.

Kind regards
Darius
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