[sdiy] varactor/varicaps?

[Oren Leavitt]

On 11/18/2010 3:29 PM, bbob wrote:
> I did a VC radio, based on a Ramsey kit that used a varactor in the
> tuning circuit.  worked, but not as useful as i'd hoped...
>
>
>

Musical application-wise, a varactor would work very well in a master 
oscillator for a top-octave generator or other 
divide-down/beat-frequency designs, although the voltage control range 
isn't very wide.
There is enough voltage-control for adjusting the tuning over several 
semitones and easily adding vibrato.
The master oscillator in the Eminent/Arp Solina (and probably the 
Eminent 310U) uses a varactor diode.

- Oren

> On Thu, Nov 18, 2010 at 3:56 PM,<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.
>>
>> 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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