[Boatanchors] Making Stable Inductors for 2 MHz
smulder3 at cox.net
Wed Jun 29 15:00:48 EDT 2011
All of the -6 toroids at this link have 35 ppm/C:
and there is a handy toroid calculator here:
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
> Thank you,
>> 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 Byan<stevebyan at me.com>
>> Littleton, MA 01460
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