I think most screwdriver antennas are tough enough to stall the
screwdriver motor without breaking anything. I doubt the cap is as
strong. Try and see, if you've got either more caps or more
screwerivers. ;->
73
Gil
W1RG
Chris BONDE wrote:
> From what I understand the "screwdriver" antenna uses the portable
> screwdriver. The circuit should be the same as needed for caps. I
> have not found the circuit with the limit switches but if it works
> for the antenna why not for caps??
> Chris opr VE7HCB
>
>
> At 12:36 PM 2002-06-14 -0400, WA2BPE wrote:
>
>> I am in the process of setting up this exact thing to remotely adjust
>> a tuner
>> using multiple screwdrivers and a simple NTSC video camera/monitor to
>> monitor
>> the settings - KISS approach. It would be best to remove the
>> batteries and
>> use an appropriate supply.. Also, some RFI filtering will be needed
>> - like a
>> 0.01 across the motor terminals. It is probably a good idea to set
>> up some
>> limit switches to avoid any chance of crunching the cap, etc.
>> Steppers are
>> great and are best for an automated system, but the drive circuitry is
>> considerably more complex.
>>
>> 73, Tom - WA2BPE
>>
>> ken.claerbout@equant.com wrote:
>>
>> > Hi Howard - I have a small cordless screwdriver which I think is
>> made by
>> > Black & Decker. I see them for sale at Home Depot for around $15.
>> It's
>> > cylindrical in nature and about 10" long. I often thought
>> something like
>> > that might work well to remotely tune a capacitor or inductor. You
>> could
>> > easily connect the shaft of the screwdriver to the shaft of the
>> cap. It
>> > offers plenty of torque. The switch on the screwdriver could
>> easily be
>> > remoted back to the shack and about the only other thing, is
>> providing it
>> > with a DC source so it doesn't have to run off of batteries. Just a
>> > thought.
>> >
>> > 73
>> > Ken K4ZW
>> >
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