Oh I see. Sorry, I misunderstood.
Good thought.
Terry
> no. i mean only the sensor of a 800k drive...
>
> On 9 mrt 2011, at 09:58, Terry Stewart wrote:
>
>> Yes, I did think of that., but I want to keep a 400 drive in there if I
>> can. If things don't work out, this is an option.
>>
>> Terry
>> ----- Original Message ----- From: "simon" <simski_at_email.domain.hidden>
>> To: <lisalist_at_email.domain.hidden>
>> Sent: Wednesday, March 09, 2011 9:43 PM
>> Subject: Re: Apple 400k drive
>>
>>
>>> maybe you can get them from a newer 800k or 1.4 drive or even a pc
>>> drive. furthermore some motors in laserprinters use the same technique.
>>>
>>> On 9 mrt 2011, at 00:07, Terry Stewart wrote:
>>>
>>>> Hi Helmut,
>>>>
>>>> I'm not sure of the exact part description of the passive hall sensor.
>>>>
>>>> In the first instance, I'm going to try and identify which ones are
>>>> faulty, and mix and match so that out of two non-working drives I get
>>>> at least one that behaves as it should.
>>>>
>>>> Terry
>>>>
>>>> ----- Original Message ----- From: "Diogenes45" <helmut_post_at_email.domain.hidden>
>>>> To: "LisaList" <lisalist_at_email.domain.hidden>
>>>> Sent: Tuesday, March 08, 2011 9:48 PM
>>>> Subject: Re: Apple 400k drive
>>>>
>>>>
>>>> Hello Patrick,
>>>> and greetings from Helmut Post!
>>>> Do you remember me?
>>>> My third IDE File is running very well!
>>>> Back to the topic: What is the exact part description of the passive
>>>> hall sensor?
>>>> Perhaps I know a place where to get obsolete and very hard to find
>>>> parts.
>>>> Lately I purchased 2 Z8 processors (Zilog 8631) with 4 KB XROM for
>>>> the 10 MB Profile - these are very hard to get, but there are still at
>>>> least more than 40000 pieces left today. The price was $ 4.06 for
>>>> each part.
>>>>
>>>> Helmut
>>>>
>>>> On 8 Mrz., 08:24, PSchaefer <dr.p.schae..._at_email.domain.hidden> wrote:
>>>>> On 7 Mrz., 21:18, "Terry Stewart" <te..._at_email.domain.hidden> wrote:
>>>>>
>>>>> > I've been in discussion with folk on the classic computer mailing
>>>>> > list > > about
>>>>> > this. The feeling was it could have either been the TA7259 motor > >
>>>>> > controller
>>>>> > IC, the associated caps or on of the hall-effect devices in the
>>>>> > motor
>>>>> > controller IC itself.
>>>>>
>>>>> Usually this is attributed to the hall effect sensors which get a
>>>>> voltage offset.
>>>>>
>>>>> With a good sensor, you can measure half the supply voltage at the
>>>>> outputs when no magnetic field is applied. The difference between both
>>>>> output terminals goes positive or negative, depending on the field
>>>>> direction.
>>>>>
>>>>> With a bad part, this signal is shifted towards the positve or
>>>>> negative direction. Therefore its zero crossing is not at the point
>>>>> where the controller expects it, which makes the signal unreadable.
>>>>>
>>>>> A drive with one faulty sensor will spin when started manually,
>>>>> otherwise it will do nothing or oscillate. With two broken sensor, the
>>>>> motor cannot operate at all.
>>>>>
>>>>> Up to now I did not find suitable replacements for the passive hall
>>>>> sensors used in the 400k drives.
>>>>>
>>>>> Patrick
>>>>
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>>>
>>> --
>>> Groeten,
>>>
>>> Simon
>>> simski_at_email.domain.hidden
>>>
>>>
>>>
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>
> --
> Groeten,
>
> Simon
> simski_at_email.domain.hidden
>
>
>
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-- ----- You received this message because you are a member of the LisaList group. The group FAQ is at http://lowendmac.com/lists/lisa.html To post to this group, send email to lisalist_at_email.domain.hidden To leave this group, send email to lisalist+unsubscribe_at_email.domain.hidden For more options, visit this group at http://groups.google.com/group/lisalistReceived on 2015-07-15 16:52:54
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