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But I am puzzled why we would put a capacitor (C2) on the video line. Wouldn't that mess up the signal some? Stretch out parts?
IC1a speaks of restoring the signal. Is that going to affect IC1b? That part of the circuit is puzzling me. Are we trying to amplify the signal?
It seems I should be able to remove IC2 and just have a logic level Mosfet fire off of the positive signal line (going into pin 3 of IC2).
FlyMario wrote:All of the caps on that circuit are meant to be ceramic right? Not cans? Hmm Seems obvious to me that they would be those ceramic ones. I got all puzzled cause I saw someone make an audio amp on youtube and used cans... makes no sense to me.
Oh ... if you ever want to feel sorry for a LM358 ... I mean truely sorry... watch this video. I could never...
https://youtu.be/5UKc3OELRPQ
Robonz wrote:
IC2 does amplify and adjust the black level. Seeing as you like digital and you are using an Arduino you could scrub all that and feed the video (IC2 pin 3) into the Arduino ADC pin. Convert that to PWM (just a couple of lines of code) and that could drive your mosfet with say 10 ohms on the gate.
It is quite possible you could extract the sync within the Arduino too using its built in analog comparator, or ADC. But get it going first.
Cheers
Keith
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