Switch Puzzle

M

Mark Jones

Guest
Okay this sounds really dumb but can a DP3T slide switch be wired to
swap two AA batteries like this:

Position 1: Vdd-B1-GND-B2-Vee
Position 2: Off
Position 3: Vdd-B2-GND-B1-Vee

This seemingly simple goal is driving me nuts! Will it require a
3P3T switch? TIA.
 
On Sun, 28 Nov 2004 23:59:37 -0500, Mark Jones <abuse@127.0.0.1>
wrote:

Okay this sounds really dumb but can a DP3T slide switch be wired to
swap two AA batteries like this:

Position 1: Vdd-B1-GND-B2-Vee
Position 2: Off
Position 3: Vdd-B2-GND-B1-Vee

This seemingly simple goal is driving me nuts! Will it require a
3P3T switch? TIA.
Click to expand...

Vdd Vee ^
B1 B2 off
Vee Vdd v


RL
 
Subject: Switch Puzzle
From: Mark Jones abuse@127.0.0.1
Date: 29/11/2004 04:59 GMT Standard Time
Message-id: <G9mdnaWIjdYQNjfcRVn-2A@buckeye-express.com

Okay this sounds really dumb but can a DP3T slide switch be wired to
swap two AA batteries like this:

Position 1: Vdd-B1-GND-B2-Vee
Position 2: Off
Position 3: Vdd-B2-GND-B1-Vee

This seemingly simple goal is driving me nuts! Will it require a
3P3T switch? TIA.
Click to expand...
would seem simple enough, center pins to vee & vcc outer pins to the cells.
 
Mark Jones wrote:

It is a split supply, +1.5v,gnd,-1.5v. Instead of physically
removing the cells and swapping them, I thought a switch
would be easier.
Click to expand...

(View with a fixed width font such as Courier)

---------------O
| <-----O-- +1.5V
| ---------O .
| |+ | .
| ----- | .
| --- ----O .
| | Battery <-----O
| ---------O . |
| | . |
----------- . |
. |
---------------O . |
| <-----O-- GND
| ---------O .
| |+ | .
| ----- | .
| --- ----O .
| | Battery <-----O-- -1.5V
| ---------O
| | 4PDT break before make switch
-----------
- Guy Macon http://www.guymacon.com
 
On Mon, 29 Nov 2004 02:00:23 -0500, Mark Jones <abuse@127.0.0.1>
wrote:

CBarn24050 wrote:
Subject: Switch Puzzle
From: Mark Jones abuse@127.0.0.1
Date: 29/11/2004 04:59 GMT Standard Time
Message-id: <G9mdnaWIjdYQNjfcRVn-2A@buckeye-express.com

Okay this sounds really dumb but can a DP3T slide switch be
wired to swap two AA batteries like this:

Position 1: Vdd-B1-GND-B2-Vee
Position 2: Off
Position 3: Vdd-B2-GND-B1-Vee

This seemingly simple goal is driving me nuts! Will it
require a 3P3T switch? TIA.



would seem simple enough, center pins to vee & vcc outer
pins to the cells.


Hmm, good but we're missing the ground. It is a split supply,
+1.5v,gnd,-1.5v. Instead of physically removing the cells and swapping
them, I thought a switch would be easier. HA! :)
Click to expand...
Google 'charge equalization'.

RL
 
On Mon, 29 Nov 2004 09:54:15 -0600, John Fields
<jfields@austininstruments.com> wrote:

Use 4P3T, see...

Newsgroups: alt.binaries.schematics.electronic
Subject: Re: Switch Puzzle (on S.E.D) - SwapBatteries.pdf
Message-ID: <hfqmq0hoq9qet0qicbbq88eu23l7qef7sv@4ax.com>

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
On Mon, 29 Nov 2004 13:58:14 -0500, Mark Jones <abuse@127.0.0.1>
wrote:

Guy Macon wrote:
Mark Jones wrote:

It is a split supply, +1.5v,gnd,-1.5v. Instead of physically
removing the cells and swapping them, I thought a switch
would be easier.

(View with a fixed width font such as Courier)

---------------O
| <-----O-- +1.5V
| ---------O .
| |+ | .
| ----- | .
| --- ----O .
| | Battery <-----O
| ---------O . |
| | . |
----------- . |
. |
---------------O . |
| <-----O-- GND
| ---------O .
| |+ | .
| ----- | .
| --- ----O .
| | Battery <-----O-- -1.5V
| ---------O
| | 4PDT break before make switch
-----------
- Guy Macon http://www.guymacon.com




Hmmm, the output polarity is reversed when the switch is in the
bottom position.

I've managed to figure out a working solution using a 4P3T slide
switch, but doesn't this seems like overkill? I call it the spaghetti
nightmare:


Vdd Mark Jones / Helios Studios
A evsgs1602 at sneakemail.com
| .--------------------------.
.----. | | 4P3T |
|+ | .----|---+---O O O O-----|-----.
----- '--|--+-|-----------/ \---------|--. |
--- | | | .----O|| O|| ||O ||O-----|--|--|--.
| B1 | | +--|-----||-/ || || \-||---. | | | |
'-------' | '--|----O|| O|| ||O ||O--|--|--|--|--+
| +--------/ \------+ | | | |
.----------|-+--|----O O O O--|--' | | |
|+ | | | .-----/ \------|--. | | |
----- | '--|--|---------------------|--|--' | |
--- '----|--|---------------------|--' | V
| B2 '--|---------+-----------' | Vee
'------------------+---------|--------------------'
Pos1: Vdd-B1-GND-B2-Vee |
Pos2: Off -----
Pos3: Vdd-B2-GND-B1-Vee ---
-

-M
Click to expand...
4P3T is what I came up with also:

Newsgroups: alt.binaries.schematics.electronic
Subject: Re: Switch Puzzle (on S.E.D) - SwapBatteries.pdf
Message-ID: <hfqmq0hoq9qet0qicbbq88eu23l7qef7sv@4ax.com>

Or use 4PDT with break-before-make if you don't need a true OFF
position.

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
 
John Fields wrote:
Position 1: Vdd-B1-GND-B2-Vee
Position 2: Off
Position 3: Vdd-B2-GND-B1-Vee

5PDT center off, I think:
Click to expand...
Based on his description of the current system (switching
the batteries by hand) I don't think he really wants or
needs position 2. I think he is trying to describe a
break-before-make switch.

(View with a fixed width font such as Courier)

DUAL BATTERY INVERTER

---------------O
| <-----O-- +1.5V
| ---------O .
| |+ | .
| ----- | .
| --- ----O .
| | Battery <-----O
| ---------O . |
| | . |
----------- . |
. |
---------------O . |
| <-----O-- GND
| ---------O .
| |+ | .
| ----- | .
| --- ----O .
| | Battery <-----O-- -1.5V
| ---------O
| | 4PDT break before make switch
-----------

-Guy Macon http://www.guymacon.com
 
On Mon, 29 Nov 2004 11:30:51 -0700, the renowned Jim Thompson
<thegreatone@example.com> wrote:

On Mon, 29 Nov 2004 09:54:15 -0600, John Fields
jfields@austininstruments.com> wrote:

Use 4P3T, see...
Click to expand...
Translated into slide switch...

www.speff.com/switch.pdf


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
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