Maker Pro
Login Join Maker Pro
Or sign in with

Menu

Connect With Us

Network

Maker Pro

Switch Puzzle

M

Mark Jones

Jan 1, 1970
0
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.
 
L

legg

Jan 1, 1970
0
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
 
C

CBarn24050

Jan 1, 1970
0
Subject: Switch Puzzle
From: Mark Jones [email protected]
Date: 29/11/2004 04:59 GMT Standard Time
Message-id: <[email protected]>

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.
 
M

Mark Jones

Jan 1, 1970
0
CBarn24050 said:
would seem simple enough, center pins to vee & vcc outer
pins to the cells.
Click to expand...


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! :)
 
G

Guy Macon

Jan 1, 1970
0
Mark said:
It is a split supply, +1.5v,gnd,-1.5v. Instead of physically
removing the cells and swapping them, I thought a switch
Click to expand...
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
 
L

legg

Jan 1, 1970
0
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
 
J

John Fields

Jan 1, 1970
0
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...


5PDT center off, I think:


+--------------------------------------+
| |
| +----------------> |<---+
| | |
| <--|---+--[+B1]--+-->| O-------->-3V
| | | |
O | | O O-------->+3V
| | | | |
+-----+---|--[B2+]------+-+----------> |<---+
| | | |
| +---------------|------------------+
| |
| | O----------------->0V
| | |
| +-->| <---+
| |
+------------------------------------+
 
J

Jim Thompson

Jan 1, 1970
0
On Mon, 29 Nov 2004 09:54:15 -0600, John Fields

Use 4P3T, see...

Newsgroups: alt.binaries.schematics.electronic
Subject: Re: Switch Puzzle (on S.E.D) - SwapBatteries.pdf
Message-ID: <[email protected]>

...Jim Thompson
 
J

Jim Thompson

Jan 1, 1970
0
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: <[email protected]>

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

...Jim Thompson
 
M

Mark Jones

Jan 1, 1970
0
Guy said:
(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
Click to expand...


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
 
G

Guy Macon

Jan 1, 1970
0
John said:
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
 
J

John Fields

Jan 1, 1970
0
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.
Click to expand...

---
Based on his description, here's what he's looking for in one
instance:

+------------->+1.5
|+
[BT1]
|
+------------->OV
|+
[BT2]
|
+------------->-1.5

and in the other:

+------------->+1.5
|+
[BT2]
|
+------------->OV
|+
[BT1]
|
+------------->-1.5

Which my circuit (and Jim Thompson's, which uses one less switch
section) gives him.

Your circuit doesn't and, in fact, reverses the polarity of the
battery into the load. Something, I'm sure, he _doesn't_ want to
happen.


As a matter of fact, your circuit seems to be the common DPDT polarity
reversing switch:


O-->\ <--O
| \ |
| O |
| |+ |
| [BAT1] +----> +/- 1.5v
| | |
| +----------> OV
| | |
+----------------> -/+ 1.5V
| |+ |
| [BAT2] |
| | |
| O |
| \ |
+--> \<--+


which doesn't even need two of the switch sections you've shown below:
---
 
G

Guy Macon

Jan 1, 1970
0
John said:
Your circuit doesn't and, in fact, reverses the polarity of the
battery into the load. Something, I'm sure, he _doesn't_ want to
happen.
Click to expand...
As a matter of fact, your circuit seems to be the common DPDT polarity
reversing switch:
Click to expand...

My error. I misread his original request and thought the he was
swapping batteries and reversing them as well (a DPDT polarity
reversing switch does the latter but not the former). I posted a
corrected schematic when I realized that I had misunderstood
the requirements. I apologize for any confusion my error may
have caused.

Here is a battery swapper that is not also a battery reverser:

(View with a fixed width font such as Courier)

BATTERY SWAPPER

---------------O
| <-----O-- +1.5V
-----|-----------O---O .
| | | .
|+ | | .
===== | | .
=== | | .
| | -------|---O .
| | | | <----
-----|---|---O---|---O . |
| | | | . |
| | | | . |
| | | | . |
| | | ---O . |
| | | <-----O-- GND
-----O---|---|-------O .
| | | .
|+ | | .
===== | | .
=== | | .
| | -------O .
| | <-----O-- -1.5V
---------O-----------O

4PDT break-before-make switch

-Guy Macon http://www.guymacon.com
 
F

Frank Bemelman

Jan 1, 1970
0
"John Fields" <[email protected]> schreef in bericht

[snip]
As a matter of fact, your circuit seems to be the common DPDT polarity
reversing switch:
Click to expand...

Let's add a schottky bridge:
O-->\ <--O
| \ |
| O |
| |+ +-------------.
| [BAT1] | .---|>|--'--|>|----.-----> +1.5v
| | | | |
| +-----------------------------------> OV
| | | +---|>|--.---|>|---'
+-------------------------'
| |+ | |
| [BAT2] | '------------------------> - 1.5V
| | |
| O |
| \ |
+--> \<--+
Click to expand...

Presto, a new and 'totally worthless idea'(TM) ;)
 
You must log in or register to reply here.

Similar threads

G
Using mosfet to switch 12V to a load with a hard ground.
Replies
16
Views
291
crutschow
crutschow
A
Switch off motor driver A4988
Replies
2
Views
110
Harald Kapp
Harald Kapp
F
500VDC/20A static IGBT switch high side gate driver with charge pump - 3.3V Vcc
Replies
2
Views
124
fmeili1
F
P
28 Pin eeprom chip switch
Replies
2
Views
150
Harald Kapp
Harald Kapp
A
Latching switch
Replies
8
Views
269
crutschow
crutschow
Top