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回覆 (2129): Sunny California
 
Even if it is just a motor, wouldn’t you still need a good power supply to get a stable voltage output for the drive?  
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i was only teasing bobui. it of course will still have a decent power supply.
drwkng
13-02-20
14:15:14
回覆 (2128): Sunny California
 
Wow, using the 27D control unit would be perfect!  
 
Even if it is just a motor, wouldn’t you still need a good power supply to get a stable voltage output for the drive?  
 
Just to share an experience, once I was moving my turntable and the stock normal power cord was too short. I had an aftermarket power cable laying around, which I had stopped using, so I just plug it in, not expecting any difference as it was just for a motor after all. I was very surprised that it offered a very noticeable improvement.  
 
I don't think it was psychological as I was not expecting, actually not even believe, it could make a difference! I still can’t explain it!  
 
It is possible that the aftermarket cord has better shielding and helped in the performance of the motor? Yes, I admit that I have no idea what I am talking about!  
 
Come to think about it, I have never changed that power cable after that, so maybe it is time to retry!  
 
thekong
13-02-20
14:05:20
回覆 (2127): Sunny California
Ah, so the DDS board has a build in crystal oscillator. Are you working a elaborate power supply?  
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the DDS board has a crystal installed for the chip. the chip itself can work with other crystal. i don't want to do any pcb so i just get an evaluation board. i will use the 27D control unit to program the chip. since it comes with a display and remote control so it makes it easier to set up the frequency and phases of the motor during operation.  
why do you need an elaborate power supply? it is just a motor^-^
drwkng
13-02-20
13:20:54
回覆 (2126): Sunny California
DDS board  
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Ah, so the DDS board has a build in crystal oscillator. Are you working a elaborate power supply?
bobui
13-02-20
12:36:54
回覆 (2125): Sunny California
I have looked at both. No harm to get them but they both more like a two coils/two phase design where you can collect in series or parallel for different voltage requirement. Their rpm is too high for LP turntable use. We should be looking at roughly 150 to 500 max rpm. The higher the rpm, the more vibration you get and the turntable need to have a very small spinder to bring the ratio down for the correct speed.  
 
As for research, I think the one I have from the old Linn would do the trick. But if you want a true 3 phase motor/power supply. Then you need to look a bit further/  
 
bobui
13-02-20
12:28:44
回覆 (2125): Sunny California
Some of the Papst motors on ebay is not too expensive. Don't know if they are the right kind though.  
 
If they are, maybe we can get one for research!  
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when i get the single and 2 phase sorted out, we can try to the 3 phase. by the way, the DDS board that i ordered can do better than 0.01Hz resolution. with a different clock, it do even better.
drwkng
13-02-20
12:19:35
回覆 (2124): Sunny California
 
Some of the Papst motors on ebay is not too expensive. Don't know if they are the right kind though.  
 
If they are, maybe we can get one for research!  
 
http://www.ebay.com/itm/Papst-1550-rpm-Tape-Recorder-Motor-120V-220V-1-5uF-NOS-/290346374829?pt=LH_DefaultDomain_0&hash=item4399fe16ad  
 
http://www.ebay.com/itm/Papst-Motoren-KG-Tape-Reel-Motor-PN-Not-Confirmed-/370333775450?pt=LH_DefaultDomain_0&hash=item56399cf65a  
 
thekong
13-02-20
12:10:45
回覆 (2123): Sunny California
Also according to this article, Mark Kelly's controller can power the 3 phase Papst as well!  
 
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this is a different beast than the one he sold. he designed this just for 3 phase motor. i read the aritcle in clarisonus.com
drwkng
13-02-20
11:55:54
回覆 (2123): Sunny California
Papst is from Germany. Some 80s turntables use them. Others opt for the Philips such as Linn and Heybrook. If i remember correctly, the Alphason turntable Chef sold me operate with two Papst.  
 
The spare one i have for your research is a Philips Synchronous Motor taken out from an old Linn. Its a two phase 50Hz motor. The Lingo supply two cleaned up Sine waves at a much lower voltage to minimise vibration. The cheaper Vahalla only offer a single phase supply with a build in phase splitter.  
 
For your reference, I also have the Naim Armageddon which I personally perfer more than the Lingo. The Naim is nothing more than a very larege transformer with a two phase supply rail. Feel free to take it for your research.
bobui
13-02-20
11:49:24
回覆 (2122): Sunny California
 
Also according to this article, Mark Kelly's controller can power the 3 phase Papst as well!  
 
http://www.audioasylum.com/reviews/Turntables/Mark-Kelly-Motor-Controller/Papst-3-Phase-Controller/vinyl/561449.html
thekong
13-02-20
11:37:43
回覆 (2122): Sunny California
 
I undestand abc2009 just got himself a TD124, but i am not sure whther it use the Papst motor.  
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wow! so this toy is going to benefit more people that i thought.
drwkng
13-02-20
11:37:40
回覆 (2121): Sunny California
 
According to this article, some Thorens TD124 may be using a 3 phase Papst motor.  
 
I undestand abc2009 just got himself a TD124, but i am not sure whther it use the Papst motor.  
 
http://theanalogdept.com/papst_aussenlaufer.htmpst
thekong
13-02-20
11:33:59
回覆 (2121): Sunny California
Last time I came across a three phase motor was more than 10 years back in a printing factory. Massive big AC motor driving a full colour printing press over 10,000rpm.  
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there is a motor called Papst? i remember this is supposed to be highly regarded by LP guys.
drwkng
13-02-20
11:31:25
回覆 (2122): Sunny California
Not a problem. Will bring it to the office tomorrow and deliver to Dr Goto.
bobui
13-02-20
11:22:02
回覆 (2121): Sunny California
All I have is a spare Linn you can have for your research.  
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good. can you drop it at alan's place? i think i can rig up the prototype pretty quickly once the DDS boards arrived. need to do some programming to control the DDS board now.
drwkng
13-02-20
11:20:13
回覆 (2120): Sunny California
Last time I came across a three phase motor was more than 10 years back in a printing factory. Massive big AC motor driving a full colour printing press over 10,000rpm.  
 
All I have is a spare Linn you can have for your research.
bobui
13-02-20
11:14:26
回覆 (2119): Sunny California
What's the catch between a three phase power supply and Sushi?  
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i was thinking about both yesterday. anyone has a three phase motor? i was thinking making the thing modular so that i can add another phase to it later to play with 3 phase motor. i suppose 3 phase motor is rather rare now.
drwkng
13-02-20
11:01:32
回覆 (2118): Sunny California
What's the catch between a three phase power supply and Sushi? Chef, we miss your cooking deeply. Are you offering? Or are you suggesting?  
bobui
13-02-19
23:04:37
回覆 (2117): Sunny California
oh yes, it is sunny !  
 
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daiwok
13-02-19
17:46:17
回覆 (2116): Sunny California
The Ebi was pout of this world !!!  
 
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and the heads were just fried until like crisps - incredible !!  
 
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some langoustines !!  
 
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daiwok
13-02-19
17:37:33
回覆 (2115): Sunny California
the rolls were pretty damn good !!!  
 
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the collar from the yellow tail I believe  
 
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daiwok
13-02-19
17:35:44
回覆 (2114): Sunny California
This has become an annual event for me, nevertheless, there are a few surprises and also memorable including this evening meal at a local Japanese place.  
 
The saki collection was very impressive, including the beers for starters  
 
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the Toro and Yellow Tail was exceptional  
 
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daiwok
13-02-19
17:34:05
回覆 (2113): VPI
well, board ordered. see how it goes.
drwkng
13-02-19
17:04:59
回覆 (2112): VPI
o.k that is a VCO circuit. it is o.k. but it makes the control more complicated and less precise than a DDS. and it would be even worse to control the phase difference of a two phase motor. i thnk i will stick to the digital solution for now.
drwkng
13-02-19
14:55:12
回覆 (2111): VPI
Sander's Speed Controller Schematic  
 
 
The CAD schematic, drawn by Nigel, can be downloaded from either of these two file hosts:  
 
Mediafire:  
 
http://www.mediafire.com/?dmta5bz5jke  
 
Rapidshare:  
 
http://rapidshare.com/files/406472763/SSC3.pdf.html  
 
Note - This information is offered in good faith but if you want to build the speed controller using this schematic, you do so entirely at your own risk. As with anything involving mains electricity, it could be potentially lethal if done incorrectly.  
 
Note 2 - this schematic has been drawn up in CAD format from Sander's original sketches. Although some speed boxes have been built from Sander's sketches, none have as yet been built from this CAD version. Therefore it is recommended that only experienced electronics DIYers attempt to build it. Equally, we would be grateful if anyone who does attempt it leaves some feedback about the process or the finished item - you can add to THIS thread if you wish.
daiwok
13-02-19
14:43:45
回覆 (2110): VPI
http://www.lencoheaven.net/forum/index.php?topic=3440.0  
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it needs a login. what does it say anyway?
drwkng
13-02-19
14:06:19
回覆 (2111): VPI
for Lencos I have a spare motor which you can test with alone
daiwok
13-02-19
14:03:13
回覆 (2110): VPI
I think I and perhaps daiwok have spare you can take for testing.  
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I have BD, ID, and DD so which one do you want ? @@
daiwok
13-02-19
14:02:01
回覆 (2109): VPI
You may want to take a look at this one
http://www.lencoheaven.net/forum/index.php?topic=3440.0
daiwok
13-02-19
14:00:51
回覆 (2108): VPI
i will get one of those evaluation board for the DDS chip to play around. these can be programmed with a PC so it would be very quickly i can come up with a prototype to test the single phase first.
drwkng
13-02-19
13:45:18
回覆 (2108): VPI
 
>This possible new invention will benefit the general human race, right!<  
______________________________________________  
 
Thanks Bobui!  
 
This is certainly great news for the BD crowd, but not sure whether it is that relevant to the ID and DD users! ;-)  
 
thekong
13-02-19
13:41:24
回覆 (2107): VPI
i have come across a simpler and higher spec solution by using standard DDS chip from Analog Devices. these chips could be programmed to output a sine wave. what one needs is to do is to program these and hook them up with a chip amp similar to those used by Mark. granted these are single chip. going for two phases would require more work but it is rather easy to start experiment.
drwkng
13-02-19
13:22:17
回覆 (2107): VPI
I think I and perhaps daiwok have spare you can take for testing.  
 
A beer lor! to me or daiwok or both. Ah! Wait, wait wait. This possible new invention will benefit the general human race, right! I should buy drwkng a beer lor!  
 
Perhaps, i should deliver one to king for his research instead! Ah ah!
bobui
13-02-19
13:21:55
回覆 (2106): VPI
 
Dr King, all my TTs, other than the Rockport, have motors built into the plinths, so can't take it out for your testing.  
 
However, don't worry, we will certainly find you something suitable!  
 
thekong
13-02-19
13:05:53
回覆 (2105): VPI
i can try something like Mark's with a chip amp tp drive the motor. the problem is i don't have a motor to test. so any spare motor lying somewhere.
drwkng
13-02-15
19:22:25
回覆 (2104): VPI
 
Actually, I did try the SDS on the Rockport a few years ago. It could start the motor at 33rpm, but not 45rpm. That started my search for a more powerful controller!  
 
But now I know that it is just single phase, so not really interested in it anymore!  
 
Also, if I understand correctly, the newer SDS only offers the 110V output version (with 220V input) for VPI's own motor. They used to have the 220V output version also, which was what I tried.  
 
thekong
13-02-15
18:30:16
回覆 (2103): VPI
When I knew about it, he discontinued it already! :-(  
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oh! how abut that offered by SDS?
drwkng
13-02-15
18:13:19
回覆 (2102): VPI
 
>his kit does not sound expensive, why don't you go for it?<  
_________________________________________  
 
When I knew about it, he discontinued it already! :-(  
 
thekong
13-02-15
16:36:11
回覆 (2101): VPI
it looks like the kit is based on that article. it mentions that it is based on chip amp with an output transformer.  
the idea of using something other than sine wave is probably to do with reducing any cogging with the motor. with digital generated signal, it would be easy to do.  
by the way, his kit does not sound expensive, why don't you go for it?
drwkng
13-02-15
16:30:37
回覆 (2100): VPI
Dr King,  
 
Don't know whether it is the same as your earlier link to Mark Kelly’s website, but he did offer a controller kit called the AC-1 a couple of years ago.  
 
Maybe you could find some information from this thread: http://www.audioasylum.com/audio/vinyl/messages/71/718147.html  
 
This is another interesting thread; both Mark and Harry (of VPI) agree that pure sinewave is not the best for driving motors. This one is new to me!  
 
http://db.audioasylum.com/mhtml/m.html?forum=vinyl&n=970378&highlight=mark+kelly+motor+controller&search_url=%2Fcgi%2Fsearch.mpl%3Fsearchtext%3Dmark%2Bkelly%2Bmotor%2Bcontroller%26b%3DAND%26topic%3D%26topics_only%3DN%26author%3D%26date1%3D%26date2%3D%26slowmessage%3D%26sort%3Ddate%26sortOrder%3DDESC%26forum%3Dvinyl  
 
thekong
13-02-15
16:01:51