[rollei_list] Re: Hearing Aid Batteries in Nikon F
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Tue, 2 Mar 2010 23:50:03 -0800
----- Original Message -----
From: "Stephen Attaway" <stephen@xxxxxxxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
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
dickburk@xxxxxxxxxxxxx
---
Rollei List
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