 SU.HARDW.OTHER (2:5020/140.13)  SU.HARDW.OTHER 
 From : Yuri Ostry                          2:5020/24.3     Thu 28 Oct 93 11:00 
 Subj : NiCads...   Was: .ࠤ ஢  Notebook                       


 GK> H᪮쪮  , 設⢥ NB ᯮ ⠭ -
 GK> 横,,० -- ॡ-樭. H ᯥ樠 ᮢ 
 GK> ॡ.

 ...    ᪠   _p_  p묨 ᠬ p裂,
 ﭭ ⮪   ᠬ ⨬쭮  ... (NiCd)

 GK>  ⮫쪮  ६৪ ᮡ --


 GK> 1)  २  䥪⮬ , ᫨  裂  ⮣,
 GK>   ࠧ廊, ᨬ쭠  ᮮ⢥⢥ 㬥.

 猪  p쭮  p   ᭥... 祭  뫠 ⮫쪮 
⭨,   p 横 p/pp 祭 ⠡... 룫廊 
⠪: ᫨ p  pp  祭  横 p裂  p殮
U1  pp裂  p殮 U2  , p, ᫥ ⮣ p ⪥ pp廊
  U2 p ᢠ   ...
  -  ⭮    ᥬ p NiCd p.  
p쭮 '⮢' p ᯫ樨   䠪p p
p p p, 祬  '䥪 ' p...

 GK> 2) H ࠧ裂 ᨫ쭥,祬  
 GK> ண 祭,㠫쭮   䨪樨 .

  -  p ⠪ ⨯ p   p...  易
 ᮢᥬ  p㣨... ᫨ pp廊 p  ᫥⥫쭮 ᮥ
 ᫨誮 㡮,   p⭮ ⮣,  '᫠'  㤥
pp殮  'ᨫ묨'   .      p 
... p  p ⠪      p -0.05v...
᫨ ᫥ ⮣ p p p廊 楫,   砫 p鸞 ⠪
ppp   p p ᬥp. "" ⠪ p
 ᫨    ⠬...   p pp ⠪ 
10000  p裂   ⠪  10-12 pp裂  ppp  
       ( ⠭ ⠬... 8-) ᫥ ⮣ 
 p廊 ﭭ ⮪ ⮡  뫠   ,  ᫥
⮣ p裂  筮,    ⠪  p p來, 
⠭p ⮪  0.1    p.   1 Ah p -
⮪ 0.1... 14-16 ᮢ...
pp p  pp  ﭭ ⮪,   
   ...
 뫨 p樨 p裂 ⠪ p 楫 (᫨  p筠) 
⮪  0.01 - 0.02C. p浪 ⠪  ᪮쪮 ⮪...   ⠪ 
p ...

          ⤥쭮...  
p⥫   ⠪ p 権  p p p pᢥp
 ᪮祬 ᢥp , ⮡ pp   砥 㡮 pp鸞...
p  ᭠砫 ⠪  p p pp, ⮡ ᬮp  
 ᢥp... ;-)

   ⮭  - ᫥⥫쭮  ᮥ  ⮫쪮 ᫨
   ⫨砥   祬  10-15%. To  ᫨   pp 
p p   p,    ᮢp襭   ᫨
p ⮦ 뫠 ... ;-) ᫨ p 뫨  p  ⥫쭮 
⤥쭮   pp 横,  ⮬ p廊   pp廊
   p㧪   p殮 ᥪ p p
㩤  ...  ⮡p  p ,  p  p 㤥 쭮
⫨...  ⮬ 砥 p ⮣,  p 㡮 pp拉  (
᪮쪮) ⮢ ppp 㤥  ...

 GK> ⠭ .  ࠫ --

. ... ᫨ p ᯮ墠   ⠪   p譮,   p
嫮⭮  p⭮...

 GK> ࠡ  ३   , NB  筥 ᭮ ,
 GK>  H H     .

H ,   p p쭮 p  p p...    
 ⠫   ⠪ 訬 㪢...

 GK>  ஢ ࠧ廊 । 浪  殮 
 GK> 0.7 V/ (H H H !) , 祬,⠪ 쭮 ।.

   ⠫ ⮣ ... 쪮 譨 p室 pp p 
᭮ p拉 㦭   p p (  . )...
᫨ p裂    pp殮 p    ⮫쪮 ᭮
pp鸞,  ᫨ p來  p pﬨ⥫  pp,    
-⥪p   祬   p   p鸞, 
 p裂 p    pp鸞...  pp , 
p ... p  設⢥ 㪮 p來  ᫨誮 㬭 
ᮯ⠢   㭨쭮 pᮢ p    p 業 
p  p - p⥫  娥 죨  p
p... ;-) ;-)

 GK>  ᢮ /ࠤ  ᯫ 
 GK> H-0.45, -0.98   - (  ⨯)  1983 .  
 GK> .

  ⮦  p p  ,  祣  Varta 
Panasonic    ... 8-) ᮡ ᫨ p pp鸞   p⨢
p⠭ - p騥 10  - power saver, 200ma - p p p⮬
㬮⥫  1.5 - p... H 0.45 쭮    p, 
   p p,  p⮢᪨   p  ⮪ ⤠,
 p ᫠   p pp鸞...

 GK>         PS       ᫥ ६ ⠫ ᯮ짮  -ਤ
 GK> ,⠪   -- ॡ 浪 ᨬ ⮪. H  
 GK> ﭭ  .

Ni-MH  p   ᫨誮 ppp, ⠪  p    祣 
, ⠪   p  Ray-o-Vac'᪨ pp裂 alcaline
p,  p來   ⢨⥫쭮 㦭 p㣨...

,   usenet  p㯯 rec.radio.amateur.misc 뫠 쭮
     p,   ⮬   
p쭮 p... 뫮 ᪮쪮 ᥬ  뫪  奬 ⮬᪨
p來  p,  ⠪ p p p ᯥ樠p 稯. 
      , ᫨  ᨫ쭮 p騥 - 
 p᫠ ⬠   Internet (p  p   宦
 p楩... ;-) ;-)

᫨   ⠪  p Maxim -    稯  p 蠥
 pp  ᪮쪮 pp/  砥 
⮬᪨ p來,  ⪫祭 p p  p拉, p祬 
p  p,    p殮... H ᪮   p
᪮᪨ p⠢⥫ ⮩ p  祬  50 㪠 祣    뫮
筮  pp...  ,   p... 8-) ᮡ ᫨  
p ⮪  p樥 p  稯 ...

  p 73  뫠 奬    "NiCad Zapper" -
⠪ pp  p p  p   ⥭ p
p訢訥  ⨭ p㫨 ⨭  ᠬpp 祭 ᨫ...
   ⠪ p  ⠪      . (筥 p
p  ⠪ p訫   ⮬쭮 p p p,
  祭 p  ,   ⠪ - ⮫쪮 p맣  p p...
;-)


, ᫥騬 쬮 뫠 ᪮쪮  p ᥬ 
㯮⮩   ᨨ... ᫨   㤥  
⥫ p 
 ⥬ -  祭 p   ⬥...

--- GEcho 1.00+
 * Origin: UA3ATQ (2:5020/24.3)

 SU.HARDW.OTHER (2:5020/140.13)  SU.HARDW.OTHER 
 From : Yuri Ostry                          2:5020/24.3     Thu 28 Oct 93 11:02 
 Subj : Ni-Cads... [continued]                                                  

[continued from previous message]

 窨   ᨨ  rec.radio.amateur.misc...

------------------------------
Date: Wed, 15 Sep 1993 17:04:04 GMT
From: uunet.ca!torn!watserv2.uwaterloo.ca!watmath!undergrad.math.uwaterloo.ca!
 neumann.uwaterloo.ca!wewallac@uunet.uu.net
Subject: need expert info on nicads.

In the Oct 89 issue of RCM there is a design for a peak
detection charger which is a lot cheaper to build then
to buy a peak detection charger.  I am currently working
on building a couple of them (to make it cheaper for my
friends and I.)  I plan on keeping two or three for me.
One I will use for fast charging C sized batteries, and
another for medium speed charging A sized batteries/
fast charging 250 mAh batteries (ie radio and receiver
batteries.)
The only problem is that it isn't easy to change the
current, so I will actually need to fix that when building
the circuit.  The main parts are: 1 power mosfet (IRFZ40)
and a 74HC4040.  There is also a 7905, and an LM324, and a 5.1V
zener.  The way I plan on building it, will also include a
7812 (12V regulator) and a heat sink so that I can plug it
into the car when driving and charge on the way to the field.
The only problem is that you need to run it off a battery or
a regulated power supply.  Thats why I want the 7812 regulator
(plus caps etc.)

Bill

------------------------------
Date: Fri, 17 Sep 1993 17:27:05 GMT
From: cs.utexas.edu!utnut!torn!nott!nrcnet0!larry.nrc.ca!larry@uunet.uu.net
Subject: need expert info on nicads.
To: info-hams@ucsd.edu

In article <m9c3n8INNar@exodus.Eng.Sun.COM> falk@peregrine.Eng.Sun.COM (Ed Falk)
writes:

>From: falk@peregrine.Eng.Sun.COM (Ed Falk)
>Subject: need expert info on nicads.
>Date: 14 Sep 1993 18:35:20 GMT


>As you've probably guessed by now, I'm planning to design and build my
>own charger -- one that does it RIGHT for a change.  Can anybody tell
>me what the lower (discharge) and upper (full charge) voltages should
>be?  Can anybody tell me what good discharge and charge currents should
>be?  (I'll be mainly using this to charge AA's for my camera gear.)

>Of course, a pointer to a consumer charger that does the same job
>would be nice too.

As someome else mentioned MAXIM makes a chip, the MAX713 that is a complete
Nicad charger controller on a chip ... other than a source of DC, it requires
a pass transistor a couple of R's and C's. It uses dv/dt sensing to determine
end of charge, and can also use temperature ( you need a pait of thermistors
... one for ambient and one in the battery pack. It will charge from 1 to 16
cells, fast charge rate from C/3 to $c (!). Switches to trickle charge
(with a selectable charge rate) when charge is complete. It's cheap ( a few
bucks, as I recall). There is an app. note and spec sheet available.

I've not yet built my super-charger, but intend to over the winter.

MAXIM can be reached at

Maxim Integrated Products
120 San Gabriel Drive
Sunnyvale, CA 94086
(408) 737-7600

Or call 1-800-998-8800 for literature, app notes, etc.

------------------------------
Date: Fri, 17 Sep 1993 17:28:52 GMT
From: swrinde!elroy.jpl.nasa.gov!usc!howland.reston.ans.net!spool.mu.edu!
 sdd.hp.com!hpscit.sc.hp.com!news.dtc.hp.com!col.hp.com!fc.hp.com!perry
 @network.ucsd.edu
Subject: need expert info on nicads.

Jose Velez (jmv@minerva.inesc.pt) wrote:
: In article <m9c3n8INNar@exodus.Eng.Sun.COM> falk@peregrine.Eng.Sun.COM (Ed
Falk) writes:

: >As you've probably guessed by now, I'm planning to design and build my
: >own charger -- one that does it RIGHT for a change.  Can anybody tell
: >me what the lower (discharge) and upper (full charge) voltages should
: >be?  Can anybody tell me what good discharge and charge currents should
: >be?  (I'll be mainly using this to charge AA's for my camera gear.)
: >
: >Of course, a pointer to a consumer charger that does the same job
: >would be nice too.

:    I would bother trying to build such a charger from scratch.  First because
: it would be rather expensive:  you would need at least one
: microprocessor/controler with an ADC.


A uP/ADC isn't necessary.  Here is a $2 analog peak detector:

                            |\
      --+--(100meg)-----+---|+\
        |               |   |  > --- charge
  +     ---(100meg)-+---C---|-/
NiCd                |   |   |/
  -              (1uf)(.01uf)
                    |   |
      --------------+---+

Note that one RC is 100 seconds and the other is 1 second.  For rising
voltage across the NiCd, in- > in+ and output = +Vcc.  For falling
voltage, the reverse is true.  The op-amp has FET inputs (10^12 ohms),
such as the LF412, LF358, or TL084.

If you're interested in building what I built, I can mail a schematic
(PCL format).


Perry Scott
AA0ET

------------------------------
Date: Mon, 20 Sep 1993 04:13:18 GMT
From:
dog.ee.lbl.gov!agate!spool.mu.edu!wupost!waikato!canterbury.ac.nz!betelgeux!kai
ser@network.ucsd.edu
Subject: DSP nicad charger (was: Re: need expert info on nicads.)
To: info-hams@ucsd.edu

In article <1993Sep18.013321.1@cc.curtin.edu.au>, zrepachol@cc.curtin.edu.au
(Paul Repacholi) writes:

> In article <m9c3n8INNar@exodus.Eng.Sun.COM>, falk@peregrine.Eng.Sun.COM (Ed
> Falk) writes: Since you are at Sun, see if you can track down a mob called
> "Intergrated Circuit Systems". They make a DSP chip that is programed for
> just this job. ;-0 and tell me where I can get them ;-)


The DSP nicad charger chip is the ICS1700. They also have one called the
ICS1720 for Nickel-Metal Hydride batteries. I don't have an address for
"Integrated Circuit Systems", however I do have an address for a crowd
in the UK that market these chips.

"Amega Technology"
Loddon Business Centre
Roentgen Road
Daneshill East
Bassingstoke
Hampshire RG24 0NG
ENGLAND

Tel: 0256 330301
Fax: 0256 330302

There is a small article on p.252 of the March 1993 "Electronics World
+ Wireless World" about these chips. They have 8 (yes, that's eight)
different ways of detecting the end-of-charge point, including thermal,
peak detection, inflection point, etc. They use a pulsed, peiodic
current reversal charge (reflex charging), and after the battery is
determined to be fully charged it reverts to a "maintance mode", which
keeps the battery topped up with occassional discharge/charge pulses.

I suggest you Fax the above company if you want more info - I have
about 30 pages of stuff, including technical data, description of
operation, etc. There are also Demo and Evaluation boards available.
Price was around 10 pounds (about US $15 I think) per chip, less for
10 or more - that was quoted in April of this year, it's probably
changed by now. From the info I have, it sounds like the "ultimate"
nicad charger! At least with current technology...



Disclaimer: I haven't actually dealt with the above company - my
info came via a friend who has dealt with them. Several of us
intend to place a bulk order for these chips, but the guy who's
in touch with the company has been too busy so far. The above
information is given in good faith, but you're on your own...


Chris Kaiser

Postgrad, Elec. Eng. Dept.
University of Canterbury
Christchurch, NEW ZEALAND

------------------------------

--- GEcho 1.00+
 * Origin: UA3ATQ (2:5020/24.3)

