| calucci |
| is there any ac motor power supply schematic for analogue turntable like linn valhala? thank you very much all in advance. |
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| tkwou |
| I have one for the Valhalla and the Axis. I can email them. |
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| marsel |
Hey can I get that schematic too?
Would be very grateful:smash: |
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| ckniker |
I, too, would like a copy of the schematics.
Thanks in advance,
Chris |
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| tkwou |
| I need your email address. Can't post attachments on the DIYAUDIO email. |
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| ckniker |
My address is: chris AT kniker DOT net
Obviously, my email address was entered this way to avoid any spam bots...
Thanks,
Chris |
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| Tengsimon |
| Hey can I get that schematic too? |
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| tkwou |
| Just send me your email address. |
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| diymax62 |
hello tkwou, I was searching this type of circuit from a very long long time... I hope you can send it to me!
libermax@tiscali.it
Thank you a lot
Massimo |
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| ValveNut |
Jumping in on the band wagon here I know but can I please have a copy as well. I have a Systemdeck I picked up that has burnt out its power supply. Is the motor supposed to be 110V? It sort of looks like a mod.
richardsonan at conwag dot com
Cheers::D |
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| tkwou |
Hi rwellerson
Your email bounced. Please check your account. |
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| tkwou |
| Armageddon's don't work in North America unless you own a pre-Valhalla LP-12. The AC in North America is 60Hz. All Valhalla and later LP-12 's run on 50Hz. |
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| Nanook |
but didn't realize this was a Linn specific request for information.
Obviously as AC is 60Hz here, then the 'geddon would output 60 Hz.
Wonder if a new pulley would create a suitable setup, unless the Valhalla uses a PLL? |
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| tkwou |
Sorry nanook, your right there. I don't think it started that way but all subsequent posts have been regarding Linn power supplies. The pulley is press fitted on the LP-12 motor. It's hard to get it off and on without the proper tools without risk of damage to the motor.
If you are requiring a power supply for a different table that was using standard out of the wall AC power then the Armageddon ps is definitely a suitable option. The Armageddon uses a pretty large toroid transformer for isolation, something like 500VA. Those don't come cheap. Not sure how small you could get away with and still get the same effect. |
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| diymax62 |
Hello Nanook, as far as I know the Valhalla supply should generate a stable, quartz-locked 50 Hz square wave, followed by a proper filter with a very high slope (probably a Chebischev one), with a 90 degrees phase shifter at the end to drive the second coil of the motor. I said "as far as I know" because I didn't received the scheme until now (but I absolutely don't want to force tkwou in any way).
The way to build a 60 Hz modified Valhalla should be easy enough, but I can't help you in any ways in the digital domain to generate a stable quatz-locked 60 Hz square wave. For the filter, you must change the value of the capacitors OR the resistors interested in the filtering job multiplying their values by a factor of 5/6 (e.g. a 120nF capacitor should be replaced with a 100 nF one, or, probably easier, a 12K resistor with a 10K one).
For the mechanical approach tkwou is absolutely right, it's too much simple to damage the motor without the rproper experience and tools to work that way.
The only thing that I can suggest (I made it a couple of years ago with a Thorens motor) is, if the pulley is a plastic one, to put the motor in a plastic bag and put it in the freezer for a proper amount of time to get an help from the thermal reduction of the size of the metal shaft, but it's a VERY delicate work, and don't forget that, after this, you must re-insert the new one...
The electronic way is reeeeaaly better...
A great salute |
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| tkwou |
| Thanks diymax62. This is certainly a viable option. Actually I have done this when I made a Valhalla to run at 45RPM. You just have to change the crystal and one resistor. To get the 60Hz output you only have to change the crystal. There were actually a few of these made by Linn when the Valhalla first came out so that people with existing North American LP-12's could update to the Valhalla without changing the motor. This didn't last long because it was easier and more profitable for Linn to have one single Valhalla board and one motor unit that could be used world-wide. |
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