[Boatanchors] Making Stable Inductors for 2 MHz

[Steve Mulder]

John,

All of the -6 toroids at this link have 35 ppm/C:  
http://toroids.info/T50-6.php
and there is a handy toroid calculator here: 
http://kitsandparts.com/tcalc.html

Steve


On 6/29/2011 10:28 AM, J. Forster wrote:
> Hi Steve,
>
> I'll take a look at powdered iron. Thanks.
>
> I'd really prefer not to mess with temp comp caps, unless absolutely
> necessary.
>
> Thank you,
>
> -John
>
> ====================
>
>
>> On Jun 28, 2011, at 9:20 PM, J. Forster wrote:
>>
>>> The frequency stability requirement is not great... about +/- 5 KHz, but
>>> this is larger than can be achieved with ferrite cores I've looked at,
>>> which are>  0.05% / deg. C.
>> I'm no expert, but isn't the conventional wisdom to use iron toroids
>> rather than ferrite for oscillator tank inductors, for exactly this reason
>> of temperature stability? It might also require a temperature compensating
>> cap of the correct tempco.
>>
>> Best regards,
>> -Steve
>> --
>> Steve Byan<stevebyan at me.com>
>> Littleton, MA 01460
>>
>>
>>
>>
>>
>
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