Antwort: Re: [sdiy] Kinda OT: electro-mechanical instruments/ solenoids
Christian.Bergmiller at daimlerchrysler.com
Christian.Bergmiller at daimlerchrysler.com
Wed Dec 8 08:55:03 CET 2004
The Problem with one solenoid for striking and damping would be the amount
of power
that is wasted when you hold several notes for some time..
I would want to write a special firmware that uses PWM to save power.
The striking pulse would be full power (the lenght of the striking puklse
could even be used for veliocity)
after the striking pulse 10% PWM could be enough to hold the damper off the
chime...
Christian
andreas.gaunitz at k
onstfack.se
Gesendet von: An
owner-synth-diy at d synth-diy at dropmix.xs4all.nl
ropmix.xs4all.nl Kopie
Thema
08.12.2004 08:49 Re: [sdiy] Kinda OT:
electro-mechanical instruments/
solenoids
2004 dec 08 kl. 04.03 skrev Ken Stone:
> The problem with this diagram as shown is you will find the movement
> of the
> solenoid too short to be practical.
Do you think so? Some of these solenoids have a stroke length of 0.7
inch (about 1.75 cm).
http://www.mpja.com/viewallpict.asp?dept=160&main=
> The reverse "C" hammer/damper is okay, though you will probably need
> to move
> the solenoid to the right, and have a pivot point even further to the
> right
> than that.
>
> H------S--P
>
> where H= hammer, S = solenoid and P = pivot.
OK. I wasn't going to have a pivot point, but let the whole
construction travel up and down. But maybe it's a good idea, to get it
more stable: (please note the Damper-on-a-stick solution for shorter
travelling solenoids he he)
DDDD--------+----------+
DDDD +--------+ I
I I
I I
I I
+------------------------+ I I
+-- Xylophone bar -------+ I I
I I
I I
BB I I
BBBB/\/\/\/\+--------+ +------+
BB +--------++-------O <--Pivot
II
II
II
II
+------+
I I
I I
Solenoid --> I I
I I
I I
+------+
>> Excellent notes, thank you. I want it to be played from a (midi or CV)
>> keyboard so that when a keyboard key is released, the corresponding
>> xylophone bar is muted. I have an idea that looks like this:
>>
>>
>> +-------------+
>> +-----------+ I
>> DDDDD I I
>> DDD I I
>> I I
>> +------------------------------+ I I
>> +-- Xylophone bar -------------+ I I
>> I I
>> I I
>> BB I I
>> BBBB/\/\/\/\+--------+ I
>> BB +---++-----+
>> II
>> II
>> II
>> II
>> +------+
>> I I
>> I I
>> I I
>> Solenoid --> I I
>> I I
>> I I
>> I I
>> +------+
>>
>> Where
>> 1) DDD is a dampening material - cotton pad or rubber
>> 2) BBB is a "heavy" bead mounted on a spring
>> 3) Key on -> solenoid extends upwards, hits a full stop a few
>> millimetres under xylo bar, bead hits xylo bar due to inertia, spring
>> pulls the bead back
>> 4) Key off -> solenoid retracts down, cotton pad dampens xylo bar
>>
>>
>> regards
>> -Andreas
>>
>>
>> 2004 dec 07 kl. 09.12 skrev Ken Stone:
>>
>>> My advice, for what it is worth-
>>>
>>> do not use a rigid set-up for striking. I used 1/8" cane with 3/4"
>>> wooden
>>> beeds glued on the end for strikers. When the solenoid is in its
>>> activated
>>> position, the bead is above the metal bar, not touching it. When the
>>> solenoid is activated, the momentum of the bead causes it to hid the
>>> metal
>>> bar, and the flex of the cane will lift it clear. It sure beats
>>> trying
>>> to
>>> electronically time the drive pulse to prevent the striker from
>>> damping the
>>> bar after it hits.
>>>
>>> Ken
>>>
>>>> Hi!
>>>>
>>>>
>>>> I'm planning to build electro-mechanical instruments; xylophone etc.
>>>> Not really a synth, but close enough (?)
>>>>
>>>> Background:
>>>> In Sweden (a small country) the cheapest solenoid seems to be about
>>>> 12
>>>> USD/ EUR. In the US some companies offer solenoids for less than 1
>>>> USD:
>>>> http://www.mpja.com/category/Solenoids/Solenoids.asp
>>>>
>>>> The above company wants me to shop for at least 100 USD to ship
>>>> overseas. This in itself is OK, I could always buy a soldering
>>>> station
>>>> or whatever. But how do I know that the solenoids are going to work
>>>> in
>>>> my project? I need about 30 of them, but it would be nice to check
>>>> one
>>>> out before ordering. Needless to say, the same brands don't exist
>>>> here...
>>>>
>>>> Question:
>>>> What should I look for in a solenoid? Do some solenoids have too
>>>> slow
>>>> response times? Could they be too weak? Why are some so cheap
>>>> compared
>>>> to others?
>>>>
>>>>
>>>> any input appreciated
>>>> -Andreas
>>>>
>>>>
>>> _____________________________________________________________________
>>> __
>>> Ken Stone sasami at hotkey.net.au or sasami at cgs.synth.net
>>> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>>> Australian Miniature Horses & Ponies
>>> <http://www.blaze.net.au/~sasami/>
>>>
>>
>>
> _______________________________________________________________________
> Ken Stone sasami at hotkey.net.au or sasami at cgs.synth.net
> Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>
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