| |
 |
|
|
Science Forum Index » Electronics Forum » Simple question: what type of switch is this
Page 1 of 1
|
| Author |
Message |
| Michael Levin |
 Posted: Sun Mar 19, 2006 6:46 pm |
|
|
|
Guest
|
I'm sure this is a very simple question, but I'm now all confused as to
which is double-pole double-throw and all that. What I want is simple: I
have one of those fake tapes with an input that allows me to play other
devices through my car stereo. The input is a male plug that is like what
you have on a set of standard small earphones. I have 2 devices: a SIRIUS
satellite radio receiver, and an iPod, both of which have female jacks that
this thing can plug into. All I want is to be able to have a selector so
that I can choose between the two of them without having to plug and unplug
(since they're both hidden in my glove box). First, does something like this
already exist that I can buy? I've tried a web search but don't really know
what terms are best - I haven't found anything. Barring that, I'll make one
myself. I bought a Y splitter, but if both objects are connected, there's a
weird hum. So, what I want is a simple switch that will break the connection
on one of the sides at a time. Like this:
iPod -----0 0------- \
0--0 >-------Y splitter---- car stereo
Satellite -----0 0------- /
the 0--0 thing in the middle should be in one of two positions, connecting
either the top or bottom circuit (but is not itself connected to anything).
This, if I'm not mistaken, is a single-pole, double-throw switch, right? The
problem is that my wires aren't single (like in the diagram above) but
triple, since it's stereo. So, what I need is a switch like that but so that
each position completes 3 circuits, not just one. What is that called? Is it
DP3T? What part am I looking for? Any advice would be appreciated!
Thanks,
--
Mike Levin
mlevin77@comcast.net |
|
|
| Back to top |
|
| David Harmon |
| Posted: Sun Mar 19, 2006 7:14 pm |
|
|
|
Guest
|
On Sun, 19 Mar 2006 17:46:21 -0500 in sci.electronics.basics,
Michael Levin <mlevin77@comcast.net> wrote,
Quote: iPod -----0 0------- \
0--0 >-------Y splitter---- car stereo
Satellite -----0 0------- /
the 0--0 thing in the middle should be in one of two positions, connecting
either the top or bottom circuit (but is not itself connected to anything).
This, if I'm not mistaken, is a single-pole, double-throw switch, right? The
problem is that my wires aren't single (like in the diagram above) but
triple,
That would be a three pole double throw switch; except that it's OK
for both ground wires to be connected all the time so you really
only need a double pole double throw, DPDT which are very much
easier to find. |
|
|
| Back to top |
|
| Michael Levin |
| Posted: Sun Mar 19, 2006 10:04 pm |
|
|
|
Guest
|
On 3/19/06 6:14 PM, in article 4474e4bb.360038765@news.east.earthlink.net,
"David Harmon" <source@netcom.com> wrote:
Quote: On Sun, 19 Mar 2006 17:46:21 -0500 in sci.electronics.basics,
Michael Levin <mlevin77@comcast.net> wrote,
iPod -----0 0------- \
0--0 >-------Y splitter---- car stereo
Satellite -----0 0------- /
the 0--0 thing in the middle should be in one of two positions, connecting
either the top or bottom circuit (but is not itself connected to anything).
This, if I'm not mistaken, is a single-pole, double-throw switch, right? The
problem is that my wires aren't single (like in the diagram above) but
triple,
That would be a three pole double throw switch; except that it's OK
for both ground wires to be connected all the time so you really
only need a double pole double throw, DPDT which are very much
easier to find.
ok, cool; which wire, on one of those standard stereo plugs, is the ground
wire? The thing has 3 sections. Which of the sections is the one that's ok
to leave connected?
Thanks,
Mike
--
Mike Levin
mlevin77@comcast.net |
|
|
| Back to top |
|
| Peter Bennett |
| Posted: Mon Mar 20, 2006 1:09 am |
|
|
|
Guest
|
On Sun, 19 Mar 2006 21:22:39 -0500, Michael Levin
<mlevin77@comcast.net> wrote:
Quote: On 3/19/06 6:14 PM, in article 4474e4bb.360038765@news.east.earthlink.net,
"David Harmon" <source@netcom.com> wrote:
On Sun, 19 Mar 2006 17:46:21 -0500 in sci.electronics.basics,
Michael Levin <mlevin77@comcast.net> wrote,
iPod -----0 0------- \
0--0 >-------Y splitter---- car stereo
Satellite -----0 0------- /
the 0--0 thing in the middle should be in one of two positions, connecting
either the top or bottom circuit (but is not itself connected to anything).
This, if I'm not mistaken, is a single-pole, double-throw switch, right? The
problem is that my wires aren't single (like in the diagram above) but
triple,
That would be a three pole double throw switch; except that it's OK
for both ground wires to be connected all the time so you really
only need a double pole double throw, DPDT which are very much
easier to find.
And just for my edification, the 3PDT should have 12 contacts, right?
Mike
No - only 9. Each pole of a double-throw switch has three contacts -
the common (moving) contact, and two fixed contacts, one for each
position of the switch.
In your drawing above, your middle moving part should be connected
directly to the car stereo input - you don't need the Y splitter
there.
--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
new newsgroup users info : http://vancouver-webpages.com/nnq
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca |
|
|
| Back to top |
|
| Rich Grise |
| Posted: Wed Mar 29, 2006 3:26 pm |
|
|
|
Guest
|
On Sun, 19 Mar 2006 17:46:21 -0500, Michael Levin wrote:
Quote: I'll make one myself. I bought a Y splitter, but if both objects are
connected, there's a weird hum. So, what I want is a simple switch that
will break the connection on one of the sides at a time. Like this:
iPod -----0 0------- \
0--0 >-------Y splitter---- car stereo
Satellite -----0 0------- /
You don't need that much switch, or the Y adapter. Each channel of your
stereo signals only needs a SPST, and you can lose the Y adapter:
1A
Quote: iPod R -----0
\ 1C
| 0------ car stereo R
1B |
Quote: Satellite R -----0 |
|
2A |
iPod L -----0 |
\ 2C
0------ car stereo L
2B
Satellite L -----0
So, you'd look for a simple DPDT switch.
Cheers!
Rich |
|
|
| Back to top |
|
| John Fields |
| Posted: Wed Mar 29, 2006 3:58 pm |
|
|
|
Guest
|
On Wed, 29 Mar 2006 19:26:39 GMT, Rich Grise <richgrise@example.net>
wrote:
Quote: On Sun, 19 Mar 2006 17:46:21 -0500, Michael Levin wrote:
---
Let's see...
29 Mar 2006
- 19 Mar 2006
-------------
10 days.
Hmmm...
Lately, Rich, it seems your replies are often late enough that the
subject matter has already been hashed over enough that your input
is superfluous.
Are you aware of that?
The delay thing, I mean.
--
John Fields
Professional Circuit Designer |
|
|
| Back to top |
|
| Rich Grise |
| Posted: Fri Mar 31, 2006 5:12 pm |
|
|
|
Guest
|
On Wed, 29 Mar 2006 13:58:13 -0600, John Fields wrote:
Quote: On Wed, 29 Mar 2006 19:26:39 GMT, Rich Grise <richgrise@example.net
wrote:
On Sun, 19 Mar 2006 17:46:21 -0500, Michael Levin wrote:
---
Let's see...
29 Mar 2006
- 19 Mar 2006
-------------
10 days.
Hmmm...
Lately, Rich, it seems your replies are often late enough that the subject
matter has already been hashed over enough that your input is superfluous.
Are you aware of that?
The delay thing, I mean.
Yes, but I usually don't notice it until it's too late. I usually read all
the way through NG, so the whole thing gets marked as read. The next day,
something suddenly shows up, which I won't realize is a week or more old,
because I haven't seen it or any part of the thread before.
I guess I'll chalk it up to a flaky server (Verizon ADSL), and pay more
attention in the future.
Thanks,
Rich |
|
|
| Back to top |
|
| |
|
Page 1 of 1
All times are GMT - 5 Hours
The time now is Sun Jul 27, 2008 3:52 am
|
|
