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Groove Runner Turntable Speed Control

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Graham Slee View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2018 at 1:58am
For the technically minded here's the block diagram...


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 04 Oct 2018 at 8:44pm
More Groove Runner pictures







The supplied universal voltage outboard power supply connects here (100 - 250V AC, 50 - 60 Hz). Rear on/off switch.



Turntable wires to supplied locking plug and plugs in here. Simple 2-wire connection.



33.1/3 setting for 50Hz turntable motors



33.1/3 setting for 60Hz turntable motors



45 rpm setting for 50Hz turntable motors



45 rpm setting for 60Hz turntable motors

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fatmangolf Quote  Post ReplyReply Direct Link To This Post Posted: 05 Oct 2018 at 8:15pm
That looks great Graham.

Jon

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ernie Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2018 at 6:07pm
I see it has DAK written on it so I assume it’ll be released as a kit? Looks damn fine Graham, any release date in mind?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ICL1P Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2018 at 6:11pm
This could be a future project for me.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 06 Oct 2018 at 8:04pm
As there is a lot of work in preparing it as a kit I thought about offering it ready-built at first. There will be some DIY even with the ready-built unit, that of connecting it to the motor - it will be supplied with

a length of 2-core mains cable (of RP3 quality...);

the outlet plug;

a 4-way terminal block;

0.1uF; 0.12uF; 0.15uF; 0.18uF and 0.22uF mains rated phasing capacitors;

2 x 3.6k resistors to be soldered in parallel for use with the 9904-111-3104 motor (if used).

Or if you have a 230V RP3 there is a possibility of only needing to take off the UK plug and soldering on the outlet connector. Mine starts on 33 with output control up full, and to run at 45 start on 33 and when up to speed flick switch to 45.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graham Slee Quote  Post ReplyReply Direct Link To This Post Posted: 08 Oct 2018 at 10:06am
Further details (better description)...

The Groove runner is a precision fixed four frequency power supply/drive for belt drive synchronous turntable motors.

Plays at the intended speed for when a 50Hz turntable is used on a 60Hz supply, and when a 60Hz turntable is used on a 50Hz supply.

Allows you to change from 33.1/3rd rpm to 45 rpm without moving the belt from the 33.1/3rd rpm pulley.

Stop position switches off supply to turntable, plus there is a rear panel on-off switch.

It outputs 110V because all intended synchronous turntable motors are rated 110V. This allows you to remove power wasting 230V dropper components.

In tests it was found to work with an unmodified 230V Rega Planar 3, giving it switched 45 rpm functionality.

Output control allows voltage reduction to reduce motor vibration.

Output power: 3.6 watts max.; under intended use: <2 watts.

Unit is powered by a 15V universal low-voltage outboard DC power supply suitable for all mains voltages and frequencies (100-250V AC; 50/60Hz).

DAK brand ready built or in kit form (kit availability to be announced soon).

Solderless phasing component kit included with both ready built and kit versions (output cable pre-terminated to output plug on ready built version).

Phasing components can be used to replace turntable manufacturers components to reduce motor stress or to enable use of alternative motors.

Ready built: £370; kit version: £310.

Next post I will discuss the motor phasing kit.

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