Electronics > Beginners
Use one single fader to atenuate 5 10mhz 0..5V analog differents signals
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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