rek-o-kut 110v voltage conversion

[graph]

hi guys,

just wondering if theres any advice on changing the voltage with a 110v rek-o-kut for use in the u.k.

i've read that using a convertor will also change the frequency but this means the rek-o-kut spins slower.

how would you solve that issue?

cheers

[Stevie342000]

Yes there may be a way found this on eBay http://www.ebay.co.uk/itm/Russco-Bodine-Broadcast-Turntable-2-Speed-50-Hz-Capstan-/221275019804?pt=Vintage_Electronics_R2&hash=item338504da1c

Its a capstan sleeve which may fit on the Rek-O-Kut motor shaft or

You could buy the motor and shaft the motor can be found here:

http://www.ebay.co.uk/itm/221215238200?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649

Maybe seem pricey but it may be the cheapest alternative there is a 3 speed 50Hz capstan sleeve as well.

[graph]

hi steve, thanks again for the info.

i found this thread here on lathe trolls: https://www.lathetrolls.com/viewtopic.php?f=1&t=995&hilit=rek+o+kut+50hz

if you scroll down you see simon mention something about using a car dc 12v with a 30amp regulated power supply.

i dont know what those bits are or if they could work?

cheers

[Stevie342000]

Yes I knew it had been mentioned before but short of searching thread or topics to find it thought it was easier to mention it again.

The easiest way is to change capstan motor pulley or change the motor, you would need to check that the inner diameter of the capstan pulley was the same diameter of the motor you have already. Which means you would not need to change the motor just change the capstan shaft or pulley to a 2 or 3 step one.

Oh yes assume you know this already you need a 240v to 110v step down transformer.

Jobs a good one, going in the other route you could use an inverter but they tend to be expensive and the sine wave is not all that good.

Hope that helps, the inverter route is not the easiest or cheapest route.

[Gus]

Here is another method if you know some electronics
http://lhchangaudio.blogspot.gr/2011/07/turntable-power-supply.html

http://www.lencoheaven.net/forum/index.php?topic=5982.270

I have already built Altman's speed controller and works fine
http://www.altmann.haan.de/turntable/

[graph]

nice one guys, very helpful indeed. thank you

i dont own the rek-o-kut but i've had my eye on the one which is in the classifieds at the moment. i'm trying to gauge what it will entail to get it working properly if i did come to own it. if i knew i could somehow get it spinning at the correct speeds that would be cool, no worries. i guess i'd just like to know for sure before buying that it should work out fine. the last thing i want is to end up with something that may cause me a huge (potentially expensive) headache to begin with.

cheers

[Stevie342000]

I had a look at the Lenco heaven Speed controller it's the way to go but there are no pcbs available right now.

You can build either a 50Hz or 60Hz version all 3 speeds are catered for.

It took awhile to download all the schematics, instructions and to read the 15 pages of threads there are a couple of threads by Nigel.

Really neat and professional job no bare anything to touch even when making internal adjustments.

You will find the pcb section in members only market place and group buys.

It would certainly be the route to go for you and for me. Now we just need to get our hands on the pcb not sure how many is in a set but its like only £4 they're FR4. From the comments everyone is pleased with them.

The design is a variable oscillator, power amp and a step up transformer.

[Gus]

The theory for a DIY inverter (2 phase motor variable speed controller), is to use mp3 track of 60 Hz, in stereo, 90° out of phase.Run the signal to a stereo amp class D . Then through a output speakers to 12 volt - 110 volt transformers and out to the turntable motor. turn up the volume until to see the motor spins.

http://www.ebay.com/itm/Nuvotem-Talema-Toroidal-Transformer-Pri-110v-Sec-12-0-12v-24vct-Tests-Good-/221341021204?pt=BI_Circuit_Breakers_Transformers&hash=item3388f3f414

mp3 player----->stereo amp class D------>12v to 110v transformers-----> turntable motor

i have allready built this for a stepper motor and runs very smoothly like a AC synchronus motor
mp3 player---->stereo amp class D----->stepper motor

here is what i used for a stereo amp
http://www.ebay.com/itm/321089161610?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

[Gus]

mp3 or Wav file of 60hz Sine wave

[Stevie342000]

That would work for Graph but would not work for me who is stuck with the standard motor speed of 33 1/3 rpm and no capstan sleeves for 45 rpm & 78 rpm.

However you could use a signal generator to drive the amplifier which in turn drives the D class power amp and then the 12 v to 110V (230V) step up transformer.

There is more than one way to go about it I like the Lenco circuit it would work for me on my Sugden Cutting Lathe.

But would go the other route to drive for example my Garrard 401, there is mileage in running it at 110V you get less rumble.

Incidentally I am on the list for one of the spare PCBs for the Lenco Speed Controller, this is certainly a project many of us could benefit from as far as motor speed control goes.

You could probably modify it to drive a motor for groove pitch. The method of signal gen, power amp and transformer would work except driven by an advance head from a tape machine or other source through a high or mid cut filter network. As it is the bass region you need to be concerned with.

[graph]

yo guys,

yh i joined up on lenco an read up a bit on whats what with the controller thing etc. that seems a fairly straight forward way of sorting out the speed issue, i think thats not too out of my depth. but would simons solution work out just as well and cost about the same?

anyway would there be any chance that i could get on the pcb list?

cheers

[Gus]

That would work for Graph but would not work for me who is stuck with the standard motor speed of 33 1/3 rpm and no capstan sleeves for 45 rpm & 78 rpm.

However you could use a signal generator to drive the amplifier which in turn drives the D class power amp and then the 12 v to 110V (230V) step up transformer.

There is more than one way to go about it I like the Lenco circuit it would work for me on my Sugden Cutting Lathe.

But would go the other route to drive for example my Garrard 401, there is mileage in running it at 110V you get less rumble.

Incidentally I am on the list for one of the spare PCBs for the Lenco Speed Controller, this is certainly a project many of us could benefit from as far as motor speed control goes.

You could probably modify it to drive a motor for groove pitch. The method of signal gen, power amp and transformer would work except driven by an advance head from a tape machine or other source through a high or mid cut filter network. As it is the bass region you need to be concerned with.

Hey stevie if with 60hz sine wave file your motor spins right @ 33.3 rpm then with 78hz (for example) sine wave file your motor should be spins @ 45 rpm and with 30 hz sine wave file should be spins @ 16 rpm.
you must to make measurements with a digital tachometer http://www.ebay.com/itm/LCD-Digital-Laser-Photo-Tachometer-RPM-Non-Contact-Tach-Motor-Speed-Meter-New-/251155886670?pt=AU_Car_Parts_Accessories&hash=item3a7a0eb24e&vxp=mtr to find the correct speeds.

[Gus]

if you can't wait for Pcb's here are some schematics and examples for sander's speed controller
http://www.lencoheaven.net/forum/index.php?topic=13981.0
http://www.lencoheaven.net/forum/index.php?topic=2042.1275
http://www.lencoheaven.net/forum/index.php?topic=2042.690
http://www.lencoheaven.net/forum/index.php?topic=2042.810
http://www.lencoheaven.net/forum/index.php?topic=2042.855
http://www.lencoheaven.net/forum/index.php?topic=2042.885

[Stevie342000]

Thanks Gus that would work fine only my machine is not running slow as it runs on 50hz but is missing the capstan sleeves for 45 rpm & 78 rpm. 16 2/3 rpm might be an option as would 22.5 Hz for trying out half speed mastering.

I suppose I could do the maths to work out what frequencies I would need but would you be so kind? I would hate to get it wrong.

I have a Heathkit AG-10 needs repair but by the time I fiddled around getting that up and running with a power amp and transformer it would probably work out more expensive. It might work nicely as a variable speed controller for a tape deck.

On the Lenco forum for the Variable Speed Controller it is advised not to run a 50 Hz motor (or least with his design) below that figure or below 30Hz. You would have to read all 15 pages to find exactly what the issue was, probably to do with AC synchronous motor and cogging (a problem with Papst motors).

There are always options with any circuit or design, personally I think I prefer the Lenco Variable Speed Controller.

But on the other hand the mp3 or variable oscillator (signal generator - you could make a tape loop or mp3 loop and copy frequencies to a cd - you could probably find an online sine wave signal generator these days) and drive a power amp with step up transformer

Both have merits or another option would be to bypass the signal generator in the Lenco design & feed it with the right frequency on a loop from a cd player.

[Gus]

if you can't wait for Pcb's here are some schematics and examples for sander's speed controller
http://www.lencoheaven.net/forum/index.php?topic=13981.0
http://www.lencoheaven.net/forum/index.php?topic=2042.1275
http://www.lencoheaven.net/forum/index.php?topic=2042.690
http://www.lencoheaven.net/forum/index.php?topic=2042.810
http://www.lencoheaven.net/forum/index.php?topic=2042.855
http://www.lencoheaven.net/forum/index.php?topic=2042.885

[Stevie342000]

Just did a simple search and found this online signal generator which you can download for free http://heliso.tripod.com/download/generator/dsg.htm

Its RAR file you may need Winzip.rar or equivlant just download that as well from net.

There you go signal generation sorted out.

[Gus]

Thanks Gus that would work fine only my machine is not running slow as it runs on 50hz but is missing the capstan sleeves for 45 rpm & 78 rpm. 16 2/3 rpm might be an option as would 22.5 Hz for trying out half speed mastering.

I suppose I could do the maths to work out what frequencies I would need but would you be so kind? I would hate to get it wrong.

I have a Heathkit AG-10 needs repair but by the time I fiddled around getting that up and running with a power amp and transformer it would probably work out more expensive. It might work nicely as a variable speed controller for a tape deck.

On the Lenco forum for the Variable Speed Controller it is advised not to run a 50 Hz motor (or least with his design) below that figure or below 30Hz. You would have to read all 15 pages to find exactly what the issue was, probably to do with AC synchronous motor and cogging (a problem with Papst motors).

There are always options with any circuit or design, personally I think I prefer the Lenco Variable Speed Controller.

But on the other hand the mp3 or variable oscillator (signal generator - you could make a tape loop or mp3 loop and copy frequencies to a cd - you could probably find an online sine wave signal generator these days) and drive a power amp with step up transformer

Both have merits or another option would be to bypass the signal generator in the Lenco design & feed it with the right frequency on a loop from a cd player.

you can create sine wave files with audacity and extract them to an iphone,mp3 player whatever. 30-35 minutes file is enough for every side of vinyl record.
also i have create my own (90 degrees out of phase) phase-shifter plug in for Audacity, if you are interesting send me a pm and i will send it you for free.
http://teribil-audio.com/2012/05/mp3-player-turntable-drive/

[Stevie342000]

Thanks Again Gus

Shows how much I use Audacity I have Sony Sound Forge on this computer as well, suspect that will have tones for setting system levels as well.

Will check it out, there are several online signal generator as well, the first one is either not so good or I am useless at getting it to work efficiently or correctly.

This webpage is useful for test tones http://www.audiocheck.net/audiofrequencysignalgenerator_index.php

[Gus]

[Stevie342000]

Neato

So in affect you could use this to drive a second motor to automatically do run-in, Separation and lead-out groove.

By changing the frequency you change the speed the motor turns at, on my deck is like 1/3 of turn for separation groove, one or two turns for lead in or faster (off the top of my head and memory) for lead out, it was probably slower and more turns.

Well got to run get a job application deadline to meet.