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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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