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Video Isolation Transformer

I've just repaired a transformer based video isolation unit. This paticular unit has centre tapped primary and secondary windings with a series RC network between the two taps (see the sketch at http://tinyurl.com/pgwovlf ).

I can't quite see why these components have been added - any ideas?
 
P

Phil Allison

Jan 1, 1970
0
I've just repaired a transformer based video isolation unit.
This paticular unit has centre tapped primary and secondary
windings with a series RC network between the two taps
(see the sketch at http://tinyurl.com/pgwovlf ).

I can't quite see why these components have been added
- any ideas?


** Instead of wasting our time by making us guess about all the details
YOU LEFT OUT - how about you remove the RC network and see what changes.

Hint - it may well be a frequency response thing ....


..... Phil
 
A

Anthony Stewart

Jan 1, 1970
0
This broad spectrum transformer gives 1:1 differential gain with excellent low frequency common-mode rejection that might be a concern from ground hum. The RC coupler provides a low common-mode impedance good for rejecting stray capacitive noise.
 
K

Kevin McMurtrie

Jan 1, 1970
0
Phil Allison said:
** Instead of wasting our time by making us guess about all the details
YOU LEFT OUT - how about you remove the RC network and see what changes.

Hint - it may well be a frequency response thing ....


.... Phil

That --||-- thing may be a tiny metal oxide varistor.

Most isolating transformers at the edge of an appliance have something
to prevent static electricity buildup.
 
P

Phil Allison

Jan 1, 1970
0
"Kevin McMurtrie"
"Phil Allison"

That --||-- thing may be a tiny metal oxide varistor.


** And if the GoogleGroping OP had provided even the most basic details WE
would not be in any doubt about such matters.

All fools like him want is to make people guess - then pick the guess they
prefer.

Purest bollocks.



..... Phil
 
J

JM

Jan 1, 1970
0
"Kevin McMurtrie"






** And if the GoogleGroping OP had provided even the most basic details WE

would not be in any doubt about such matters.



All fools like him want is to make people guess - then pick the guess they

prefer.



Purest bollocks.







.... Phil

Don't you ever tire of the role of village idiot?
 
P

Phil Allison

Jan 1, 1970
0
"Kevin McMurtrie"
"Phil Allison"

That --||-- thing may be a tiny metal oxide varistor.


** And if the Google Groping fuckwit OP had provided even the most basic
details WE would not be in any doubt about such matters.

All fools like him want is to make people guess - then pick the guess they
prefer.

Purest bollocks.




..... Phil
 
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