Hi Guys,
This is unrelated to Teensy; it's actually a project regarding a raspberry pi, but I digress.
What I'm looking to do is connect a 75 ohm output impedance (composite video), to 4 displays. Of course, in order to maintain correct (or there abouts) image, I need to match the output impedance of the signal to the input impedance of the displays (tv's in this case).
Now, assuming the signal from the output is split and connected via 75 ohm leads to each tv, we have this scenario:
Where in this case R is 75 ohms. This would mean that at point A, the output can see an equivalent series resistance of 17.5 ohms, therefore, I need to increase the resistance of each line to 300 ohms (300 / 4 parallel lines = 75 ohms per line).
Is that correct, or have I misunderstood what I've read regarding this?
This is unrelated to Teensy; it's actually a project regarding a raspberry pi, but I digress.
What I'm looking to do is connect a 75 ohm output impedance (composite video), to 4 displays. Of course, in order to maintain correct (or there abouts) image, I need to match the output impedance of the signal to the input impedance of the displays (tv's in this case).
Now, assuming the signal from the output is split and connected via 75 ohm leads to each tv, we have this scenario:
Code:
--R---A-----R--input1
|---R--input2
|---R--input3
|---R--input4
Where in this case R is 75 ohms. This would mean that at point A, the output can see an equivalent series resistance of 17.5 ohms, therefore, I need to increase the resistance of each line to 300 ohms (300 / 4 parallel lines = 75 ohms per line).
Code:
--75---------225--75--input1
|---225--75--input2
|---225--75--input3
|---225--75--input4
Is that correct, or have I misunderstood what I've read regarding this?