[rollei_list] Re: Hearing Aid Batteries in Nikon F
- From: stephen@xxxxxxxxxxxxxxxxxx
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 03 Mar 2010 22:52:14 +0000
Hi Richard:
You are correct, silver does not have as flat a discharge curve as mercury.
In practice, though, it hardly matters. I even use 1.5v alkalines in my
original Photomic. Horrors!
-----Original Message-----
From: Richard Knoppow [mailto:dickburk@xxxxxxxxxxxxx]
Sent: Wednesday, March 3, 2010 02:50 AM
To: rollei_list@xxxxxxxxxxxxx
Subject: [rollei_list] Re: Hearing Aid Batteries in Nikon F
----- Original Message ----- From: "Stephen Attaway" To: Sent: Tuesday, March
02, 2010 8:04 PM Subject: [rollei_list] Re: Hearing Aid Batteries in Nikon F >
Hi Richard: > > If you send your Nikon F to Robert Decker (drwyn@xxxxxxx), > he
can convert it to use 1.5v silver cells. > > I've had him do several of my
oldies and they work fine. > --- > Rollei List Thanks for the tip. I am not
sure whether silver oxide cells have as flat a voltage characteristic as zinc
air cells. It is the constancy of voltage which is important. Very few of the
devices that use mercury cells have any sort of voltage regulation in them;
they depend on the properties of the mercury cell. If the voltage is not
constant adjusting the meter to read right with a fresh cell means it will
drift off as the voltage drops. My research on currently available cells
indicates that the zinc-air cell comes closes to the mercury cell in the
flatness of its voltage output. It is simply not as long lived. Mercury cells
were used in some peculiar applications. A common one was as bias cells in
electronic equipment which ran on batteries. Obtaining the bias from the cell
allowed more of the main battery voltage to be applied elsewhere. These cells
were often soldered in because they operated with essentially no load and would
last for decades. -- Richard Knoppow Los Angeles, CA, USA
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