simple audio/video switch

[js5895]

Hi,

I have a cable box with three pins on the back, constant 9VDC, GROUND,
and 3VDC(when switched by remote, normally 0VDC). I want to use the
GROUND and the 3VDC to switch RCA style Video and audio lines, that's
four lines per source (video, audio left, audio right, and ground). I
want the lines connected tv to converter then when switched, tv to
computer. I was thinking of using relays but that might be sloppy
because, I would need four 3VDC SPDT relays to switch at the same
time. Does anybody know of a simple way to switch audio/video lines
back and forth using the 3VDC on the back of the converter.

Thank you.

 

[John Fields]

On Thu, 23 Jul 2009 21:42:00 -0700 (PDT), js5895 <JoshTmp@nycap.rr.com>
wrote:

Hi,

I have a cable box with three pins on the back, constant 9VDC, GROUND,
and 3VDC(when switched by remote, normally 0VDC). I want to use the
GROUND and the 3VDC to switch RCA style Video and audio lines, that's
four lines per source (video, audio left, audio right, and ground). I
want the lines connected tv to converter then when switched, tv to
computer. I was thinking of using relays but that might be sloppy
because, I would need four 3VDC SPDT relays to switch at the same
time. Does anybody know of a simple way to switch audio/video lines
back and forth using the 3VDC on the back of the converter.

---
View in Courier:


9V>-----------+-------+ C
| | O
[DIODE] [COIL]- - - -\
| | NO O--> \<--O NC
+-------+
|
C
3V>---[1K]--B
E
|
GND>----------+

JF