TV cable signal splitter...

Status
Not open for further replies.

Externet

Advanced Member level 2
Joined
Jan 29, 2004
Messages
579
Helped
28
Reputation
58
Reaction score
29
Trophy points
1,308
Location
Mideast US
Activity points
5,690
Hello.
Borrowed images from the web; should work for asking.




If two inductors are added to the circuit above, connected each jumping from 'input' to each 'output' Would it become a "DC pass" kind of splitter as the one below, or something else should be considered ? ( Did not find a generic schematic sample for the DC pass flavor )

 

Sort by date Sort by votes
Assuming that the DC current to be passed is low and and will have no or minimal effect on the transformers, move the input capacitor to the grounded end of T1 and remove C3 & C4, there will then be a DC path from the input to both outputs.
The input capacitor should be large enough so that its impedance at the lowest operating frequency has minimal effect on the input impedance.
 

Upvote 0 Downvote
The circuit looked odd to me, it looks like it has been copied from a patent application. I assumed that L1 - L4 were representing the connecting wires, and that it is supposed to be DC isolated on all ports, hence the capacitors.
I cant see much use for C1 & C2., but then Externet did imply that it was just an example circuit.
 

Upvote 0 Downvote
That's what I would expect, too. The solution in post #2 (insert a capacitor at T1 footpoint) should work. Probably want to connect multiple ceramic capacitors in parallel for low inductance.
 

Upvote 0 Downvote
Thanks, gentlemen.
At first, the schematic linked at post #5 seemed a DC pass device but it is not, T1 being few turns on ferrite. Will have to modify one as suggested.
 

Upvote 0 Downvote
Take care that the DC current does not saturate the transformer ferrites
 

Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…