Systemdek motor driver schematic - diyAudio
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Old 19th March 2004, 12:08 PM   #1
6J5 is offline 6J5  United Kingdom
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Default Systemdek motor driver schematic

Hello

anyone got a circuit schematic for a Systemdek IIX motor drive?

any info on spares scources in UK ?

cheers
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Old 21st March 2004, 05:01 PM   #2
sreten is offline sreten  United Kingdom
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Standard synchronous motor PSUs are remarkably simple.

All you need is a series resistor and plase shift capacitor.

All the info you probably need is here :

http://www.neilmcbride.co.uk/ttpsu.html

note here the point is trying to run the motor at about 85VAC,
much lower than normal but with 240VAC and no transformer
the motor network is basically the same but with say 7K.

IMO I think 500VA is utterly ridiculous and 50VA would be fine,
but when your charging whatever they did for a box with one
transformer, one resistor and one capacitor I expect the
weight of the box is comforting to the gullible consumer.

sreten.
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Old 21st March 2004, 06:46 PM   #3
6J5 is offline 6J5  United Kingdom
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Default Fried Resistor

Hi Streten

I've actually got a working driver ( xtal controlled 50Hz + motor amp, original systemdek) I just wanted to check on a value of a resistor that fried and colour code could not be read.

thanks for the link.

cheers
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Old 21st March 2004, 07:24 PM   #4
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Quote:
IMO I think 500VA is utterly ridiculous and 50VA would be fine,
Don't know about that. I experimented with around 100VA and in comparison with a Valhalla and home made 'linto' it sounded absolutely ridiculous. I wouldn't imagine the Geddon sounds anything like that.
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Old 29th March 2004, 01:23 AM   #5
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Default fried resistor

I have a bag of 33k 10w resistors leftover from my service engineer days. They were uprated replacements either for the systemdek electronic or the manticore manta. Unfortunately i can't remember which one!! The circuit I'm thinking of used the 33k resistor to provide a low voltage power supply for the oscillator and driver ics, the motor driver transistors being powered separately with a higher voltage. The original resistor was a 2w carbon type which failed frequently as the low votage supply was maintained all the time the turntable was connected to the mains.
I could be talking about the wrong turntable completely but maybe this will give you some ides as to where you might start looking. What you need to establish is what the resistor is for. If it's in series with the motor then it will be a much lower value. If it is dropping mains voltage to about 12v or so then a 33k would be about right.
Have plenty resistors left if you need one
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Old 29th March 2004, 02:45 PM   #6
6J5 is offline 6J5  United Kingdom
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The resistor in question is the output stage driver transistor load which turned out to be around 34k at 2W. The reissued (1989) driver board does use a 22K, 7W R to feed a zener/3 pin regulator for the clocks and filter opamps.

The hole thing is floated as no isolation transformer is used the Gnd plane being at neutral potential- very tricky if you want to test with earthed test kit so be careful.

So although you may have refered to a different model altogether your 33k was spot on.. thanks.

Any advances on where to get reasonably priced drive belts for the Systemdek IIE?

cheers
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Old 29th March 2004, 03:25 PM   #7
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So your systemdek is spinning again - excellent news! I always thought that when properly set up, it could match the much more expensive linn / roksan rivals of the time especially with the acrylic platter upgrade.
As far as i know, Audionote launched their own range of decks based on the systemdek design. Might be worth finding out what they are charging for belts.
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Old 29th March 2004, 03:42 PM   #8
sreten is offline sreten  United Kingdom
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http://www.gbaudio.co.uk/data/belts.htm

Belt23 looks perfect.

Or here :

http://www.musonic.co.uk/recordbelts.htm

Personally I made and fitted an acrylic mat to my SystemDek IIX.

IMO a rubber 500g or 1Kg mat on the glass is best.

sreten.
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Old 29th March 2004, 05:24 PM   #9
6J5 is offline 6J5  United Kingdom
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Thanks chaps ..

it's spinning fine but still using the original glass platter, OL RB300 mod + dynaVect 10x.

sreten: care to tell us how you made the mats & got material (acrylic etc) ?

cheers
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Old 29th March 2004, 07:23 PM   #10
sreten is offline sreten  United Kingdom
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I bought some clear acrylic sheeting for green houses or similar.

About 2mm/2.5mm thick.
I knocked up a rig for cutting circles from the centre hole with a jig saw.

I cut three pieces 12" diameter and added a label cutout on one.

I glued the pieces together using black acrylic car paint, and used
the same paint to finish off the top surface. Polishing the edges
was a bit of a pain but I left them clear, looked quite cool.

The end result should be an acrylic mat 6mm to 9mm thick.
Of course you can add more layers to make a platter.

I reckon the acrylic mat was 7mm thick and on the SystemDek
was better than the standard felt mat. But it wasn't as good
as my Disk SE2.2 (2.2lb=1Kg) hard rubber mat - which simply
has a less bright and more controlled treble register.
(The SE2.2 has the advantage of a very subtle optimum profile.)

I think its now doing sterling duty covering up the holes on
a japanese belt drive, the ones with large platter cutouts.

sreten.
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