digital "pots" have been around for quite a while...
philmt59 at aol.com
Tue Mar 20 15:44:15 CDT 2012
I'm quite impressed that the capacitance goes that low. Making a five-bit digitally-switched capacitor with standard 4000-series CMOS is fairly straightforward, but obviously you are limited by the stray capacitances present. The Arduino-based crystal set is still on the cards!
On 20 Mar 2012, at 11:44, Robert E. Seastrom wrote:
> I was disappointed they only go up to 5.5pF. Nowhere near enough to
> build myself an Arduino-driven crystal set.
> Mike O'Dell <mo at ccr.org> writes:
>> I see - "Sparkgap Defined Radio"
>> On 3/19/12 10:55 PM, Joseph Bento wrote:
>>> Now if they can make them with the equivalent of 3,000 volt spacing on the plates...
>>> Joe, N6DGY
>>> On Mar 19, 2012, at 8:53 PM, Mike O'Dell wrote:
>>>> this was, i guess, inevitable? digitally adjustable capacitors
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