Hello there,
This is my first post here. I would like to ask for help regarding the building of my own turntable. Where can I find some cheap motors and regulators so that my T/T can operate at 33 1/3 and 45 rpm only, and not at any other speed? My power mains are 230V by the way. This will be my first DIY project, and I do not want to mess it up, and I am paying for these, so currently I am on a tight budget.
Regards
Qizhe
This is my first post here. I would like to ask for help regarding the building of my own turntable. Where can I find some cheap motors and regulators so that my T/T can operate at 33 1/3 and 45 rpm only, and not at any other speed? My power mains are 230V by the way. This will be my first DIY project, and I do not want to mess it up, and I am paying for these, so currently I am on a tight budget.
Regards
Qizhe
Look for a Victor TT 71 motor unit. They come up cheap on Yahoo Buyee from time to time and your not going to DIY something better without spending a lot more.
BillWojo
BillWojo
For a first DIY project a full scratch-built turntable is not a good choice, especially on a limited budget. Do you have a current turntable? If you read many of the posts in this forum you will discover that in many ways it is easier (and more educational) to improve an existing design by doing thing like rebuilding the plinth or adding an external motor controller.
There are several threads where folks discuss where to find good cheap older turntables that will provide a solid base to improve on.
How about the tonearm? One thing you may want to consider is something like Nanook's 219 Unipivot arm. It can be done very cheaply with minimal tools and will give you experience in things like cartridge alignment and setup. It's actually on my list of projects I want to do, but I'm deep in the middle of a speaker build right now and don't have the extra time.
Good luck,
-bill
There are several threads where folks discuss where to find good cheap older turntables that will provide a solid base to improve on.
How about the tonearm? One thing you may want to consider is something like Nanook's 219 Unipivot arm. It can be done very cheaply with minimal tools and will give you experience in things like cartridge alignment and setup. It's actually on my list of projects I want to do, but I'm deep in the middle of a speaker build right now and don't have the extra time.
Good luck,
-bill
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TT Build, the ideal opportunity to learn Fusion 360. acquire a 3D printer, lathe, milling machine and a plethora of associated hardware if you don't have the luck to have access to same.
Not inexpensive and a very very steep learning curve.
That being said a better plinth, upgraded PS and general rehab of a commercial table is very much in reach with minimal outlay of cash, space and time: and more important generally very worthwhile.
Not inexpensive and a very very steep learning curve.
That being said a better plinth, upgraded PS and general rehab of a commercial table is very much in reach with minimal outlay of cash, space and time: and more important generally very worthwhile.
Right, so my current budget is about 20USD. I have access to the wood and metal and other materials for free has my school has been willing to provide 'em. For this pricing, could you recommend any motor for me?
So I have found out about motor controlling with ESCs. How do I use it to set the speeds of a motor at either 33 1/3 rpm or 45 rpm?
You are dreaming. ESC is for radio control cars not turntables.
You can DIY a turntable that costs less than $100's dollar commercial offering. You cannot DIY turntable for free.
If you can obtain cheap pre-loved turntable you can build new plinth with your wood and make/change parts as funds permit.
Look around the internet for DIY turntable ideas and calculate cost.
You can DIY a turntable that costs less than $100's dollar commercial offering. You cannot DIY turntable for free.
If you can obtain cheap pre-loved turntable you can build new plinth with your wood and make/change parts as funds permit.
Look around the internet for DIY turntable ideas and calculate cost.
The Singapore $ is about 0.75 % of the US $ which isn't too bad but Singapore wont publish figure for its citizens in the bottom or low end of the income scales .
Plenty of work though .
Look out for very cheap old Japanese decks .
Plenty of work though .
Look out for very cheap old Japanese decks .
Right, so I have prospective secured funding of up to USD50 now, in total USD70, so I can raise my budgets. My current new budget from my school's Engineering Interest Group can be obtained if I secure a place as a group member. Therefore, I would like to ask here how PWMs work on motors to control the voltage of the motor, and how I can find out the pulse duty-cycle timing for the motor to spin at either 33 1/3 RPM or 45 RPM. I assume I have a 24-volt BLDC motor that can spin at 4000 rpm without any load for this guidance.
I would suggest having a look on youtube for such a tutorial [emoji106]
And I am not sure a BLDC motor which runs at 4000 RPM would be a good candidate for direct drive, it may not have the torque at a low RPM. You'll probably want to use a belt drive or similar to reduce it.
And I am not sure a BLDC motor which runs at 4000 RPM would be a good candidate for direct drive, it may not have the torque at a low RPM. You'll probably want to use a belt drive or similar to reduce it.
So how do I find a motor to use and to make it spin at a constant speed itself? Could someone recommend me some tutorials? I am actually making this because the online tutorials just do not make it spin at a constant speed, instead requiring the use of a potentiometer to control the speed.
Literally put "BLDC motor control" in youtube and like eleventy bajillion videos came up by good maker channels
Normal speed control is load dependent and not precise.
Back to the RC car analogy - speed control is slower, faster; not exact RPM.
Measuring the speed and using feedback can regulate the speed, think cruise control on an automobile. Still not precise though. For a turntable you require rock steady speed.
Usual way is with a synchronous motor running from the mains frequency or a synthesized ac speed controller.
See the thread:
DIY 4 Phase Sinewave Generator for Turntable Motor Drive
Back to the RC car analogy - speed control is slower, faster; not exact RPM.
Measuring the speed and using feedback can regulate the speed, think cruise control on an automobile. Still not precise though. For a turntable you require rock steady speed.
Usual way is with a synchronous motor running from the mains frequency or a synthesized ac speed controller.
See the thread:
DIY 4 Phase Sinewave Generator for Turntable Motor Drive
The usual way that has been used since electricity took over from clockwork is the ac synchronous motor.
BLDC drives are used in ceiling fans and inverter air conditioners.
Many burn out.
Try in scrap.
Or use old auto parts...the flywheel from a small car can be your platter, and gears used to reduce the speed to required.
Use the flywheel gears to give signals to a proximity switch based feedback speed control.
Good for Raspberry Pi or Arduino practice, get kids from there to join.
Many burn out.
Try in scrap.
Or use old auto parts...the flywheel from a small car can be your platter, and gears used to reduce the speed to required.
Use the flywheel gears to give signals to a proximity switch based feedback speed control.
Good for Raspberry Pi or Arduino practice, get kids from there to join.
BLDC drives exist in servo motor drives and inverter refrigerators too.
And in CNC metal working machines.
Go on, do something new...
And in CNC metal working machines.
Go on, do something new...
Anyways, do you prefer BLDCs or AC Syncs? I'm quite sorry for the bump, but haven't been able to post for a while as I'm quite busy with exams...
For a turntable, a fan rated at about 30 watts is enough.
AC run above 700 watts, fridges about 100 inwards.
AC run above 700 watts, fridges about 100 inwards.
My school actually provides them all, especially as they have an Interest Group dedicated to engineering. In fact, almost all the tools are provided, so there should be no problem. Feel free to PM me about the procedure, I check this forum more regularly now since its almost the school holidays here.