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In Reply to: DC Motor source? posted by DigitalDevil on January 01, 2002 at 08:15:09:
Depends what you need.Do you need a whole kit or can you build everything yourself if you purchase only the bare motor?On which type of turntable do you want to mount it?
The www.teresaudio.com site sell the whole complete set for $375 plus shipping but it is compatible only as a stand alone unit.Look them up.Their motor is sourced from Maxon of Switzerland and the catolog number appears in their website. Maxon DC motors are sold by the company or their distributors. The motors which are relevant for turntable use are #110189( the one sold on the teres site),the
2326-942-12-111-050 and the 2326-949-12-111-050.These last 2 models are a few years old(about 4-5 yrs).The 949 version is the best of the three.You will need a simple regulator like the LM338 to obtain perfect stability of the speed.You will also need a precision pulley.
There are two excellent articles on the subject in two old magazines of Sound Practices, #10 and #11. There is also lots of info on the teres site if you have the patience to go through all the relevant emails.
I purchased the 942 version as a bare motor from the agent in Israel(that is where I live), and a very sophisticated variable stabilized DC power supply from a junkyard for peanuts.The teres guys(Chris Brady)sold me one of their excellent pulleys which I fitted on my motor.
The price of these motors(the 942 which I purchased- and the type which teres use) in Israel is around $85.If you decide to build your own and have trouble sourcing a motor, email me and I will try to help you out.The price of shipping from Israel is relatively cheap.
Have fun.
Follow Ups:
Good post Ephraim!I was on the orginal Teres design team when we went through this motor analysis. We went to the 11089 primarily because this is what Manfred Huber spec'd out for his wonderful motor controller. Manfred essentially went through the same analysis as Dr. Wilimzig did in SP #10 so there was no difference in philosophy.
One thing to note is that Manfred's controller design (licensed to Chris / Teres) requires that you use a strobe disk and an infared sensor. The strobe attaches to the bottom of the platter and the sensor has an umbilical running to the motor pod. The sensor needs to be from 1 to 4 mm from the strobe, with 1-2 mm being preferable. In other words, if it isn't designed into the base from the ground up, you might have to roll up your sleeves to get the platter to talk to the controller.
When Peter and I reviewd design choices for our 'tables, we opted for a bit more simplicity - an LM317 based controller and more recently a battery power supply for it. Battery power really snapped our heads to attention.
We're both big fans of the features of Manfred's controller, but at the same time, the simplicity of a battery powered, LM317 regulated controller appeals to us - especially considering the inquiries we've received about variable (manual) speed control to compensate for off-speed recordings. This is easily implemented in controllers like Verdier's and ours (which we have done).
Manfred has given us permission to license this controller, and there's indeed a possibility of us doing this sometime later in the year, but it is an integrated solution not quite plug 'n play for the needs I believe you've expressed. I have never asked Manfred whether he's considered designing variable pitch control into his controller. Perhaps Bernahard or Hartmut can comment since they hang out here.
Cheers,
Thom
Tom: when you refer to Peter and your table in your post, are you refereing to the Terres table? and is the battery option available?
Some follow-up information for you about the Maxons ... I just spoke with my local Maxon rep and learned the distinction between the two motor series:The 2326-941-12-111-050 (the 24V motor) referenced by Dr. Wilimzig in the Sound Practices article (issue #10) is part of the "S" program motors which will eventually be discontinued.
The 110189 is part of the "A" series (Alcomax) and was designed to replace the "S" motors for cost purposes. These are a bit cheaper looking on the outside - plastic endcaps, rolled aluminum cases instead of the cast cases in the "S" motors. I have been assured that from a performance standpoint they are identical.
Pricing is at present, similar:
2326-941-12-111-050 (in quantities of 1 to 4): $85
110189 (in quantities of 1 to 4): $84.40Cheers,
Thom
Sorry,I was trying to keep this non-commercial. It's a fine, fuzzy line between disseminating information and being blatently commercial.
Actually, Peter is "Reverendclark" and we're Redpoint Audio Designs. Rather than waste bandwidth, check the link below. Our genesis & what we're about is fairly well described in the "Intro" section.
Regarding batteries, the folks at GT Audio (www.gtaudio.com) are indeed correct in their assessment. They're producing Verdier authorized battery/charger units for the Verdier turntables - a significant and intelligent move, IMHO.
Cheers,
THom
Big Thankyou! Perfect! NT
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