[sdiy] varactor/varicaps?

[Scott Gravenhorst]

<lanterma at ece.gatech.edu> wrote:
>They're kind of useless for audio - there's not enough variation  
>available. They're really for radio frequencies.

Yes, years ago I'd seen one used in a Popular Electronics FM transmitter project
where the diode was used to modulate an RF oscillator.

>I had a student try to build a filter with them once, no success at  
>all. Rapidly switched to another project.
>
>Sent from my iPhone
>
>On Nov 18, 2010, at 3:40 PM, "dan snazelle" <subjectivity at hotmail.com>  
>wrote:
>
>> anybody know much about varicaps? they sound too good to be  
>> true...voltage variable capacitance up to 200pf?
>>
>>
>> of course a lot of them come in weird form-factors (sot-23,etc)
>>
>> anyway, wondered why i never see them in any projects.
>>
>> thanks
>>
>>
>>
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-- ScottG
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-- Scott Gravenhorst
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