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| Use one single fader to atenuate 5 10mhz 0..5V analog differents signals |
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| jhpadjustable:
Thank you. On that digipot, watch out for the charge pump noise spec. Depending on your video levels you might see some herring-bone effects. A simple JFET shunt attenuator would be fully analog and tiny, if you don't mind generating a negative supply, but might require hand selection of components to match channels. |
| Axxel:
--- Quote from: jhpadjustable on November 22, 2019, 07:24:36 pm ---Thank you. On that digipot, watch out for the charge pump noise spec. Depending on your video levels you might see some herring-bone effects. A simple JFET shunt attenuator would be fully analog and tiny, if you don't mind generating a negative supply, but might require hand selection of components to match channels. --- End quote --- The rgb signals are form 0 to 5V, just before attacking the NTSC encoder I will pass by a divisor bridge to get the 0 to 0.7V. I will buy those chips on moday, these are disponible in the shop. I will try this and let's see what about the noise... Negative, no. Only from 0V to 5V. JFET shunt attenuator I never built one. https://www.nutsvolts.com/magazine/article/fet_principles_and_circuits_part_2 This should be a great solution, and as you said, FULL ANALOGIC! I will try this configuration too... |
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