small valves

[Peter C. Wallace]

On Sun, 22 May 2005, Allison wrote:

>>
>> 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
>


If its just for a demo, you could reduce the current (and the speed) by using 
multiple turns in the core...

Peter Wallace