Posted by cris_aov on
URL: https://www.es-forum.com/Digital-converter-for-t-v-problems-help-appreciated-tp1553564p1553574.html



I think the power supply may be the main problem, the power supplies used for almost all of our electronics are called "switching power supplies" and these generate a lot of RF noise by the very nature of how they work.


Ive found that when you electrically connect two devices (like your tv to the DA converter box) in which each device has its own power supply, this can sometimes create some really nasty results, I think this is what happens

1. power supply for dac box generates a lot of rf noise


2. rf noise from power supply travels to DA box and adds to the rf being generated by the da box itself (the bulk of the total rf noise will be more than likely from the power supply)


3. all this RF then travels to the TV and the TV "amplifies" all this nastyrf noise as well as the rf already generated by the TVs power supply and the TV itself.



Theres two things you have to do which I can think of that will make a big difference, the one that will make the major difference is number 1

1. Replace the "switching power supply" of the DA box with a "linear power supply", a "linear power supply" works differently than a "switching power supply" , a linear power supply generates no rf or only extremely little. Another alternative would be to replace it with a high capacity battery butthis might not be most convenient solution.

2. Have each device plugged into its own rf isolated surge protector, something like a tripp lite isobar or the one Marc uses.


-Cris