small valves

[Allison]

>
>Subject: Re: small valves
>   From: Gordon JC Pearce <gordon at gjcp.net>
>   Date: Sun, 22 May 2005 11:04:17 +0100
>     To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Tony Duell wrote:
>>>On Mon, 2005-04-25 at 13:39 -0400, Allison wrote:
>>>
>>>>Good approach.  I enjoy building and winding my own cores
>>>>be they EI iron or powered iron/ferrite types is part of 
>>>>that.
>>>
>>>Are these cores suitable for use in making data memories? Ie. could one
>> 
>> 
>> I would hope not!. To make a core memory you need a magneitcally hard 
>> material that will stay magnetised. But for a transformer or inductor, 
>> you want a soft (magneticaly) material. 
>> 
>> -tony
>
>What about a small steel ring, or washer?
>
>Gordon.

You would need a large amount of curent, in amps possibly 10s of amps
for that.  Volume of material counts.  Oh, they would be very slow.


Allison