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Old 17th February 2005, 07:10 PM   #1
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Default New EASY DIY brushless motor

hi guys

i was looking into how to build a cheap but good quaility brushless motor for my prototype DIY turntables ...and i found this

http://www.audioorigami.co.uk/Floppy...pyDIYMotor.htm

for only a few quid make a excellent project ...and total time to convert is a few hours

cant be bad can it?

any questions feel free to ask
best wishes
j7
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Old 20th February 2005, 08:27 PM   #2
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ive been testing the last week
i found that you can vary the speed controller input signals ...we can control the output giving 33 rpm and 45rpm and 78 rpm....FROM A SINGLE PULLY SIZE...with a simple variable restistior (<---thats a volume knob control for the less tecs)
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Old 20th February 2005, 09:04 PM   #3
Illusus is offline Illusus  Canada
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Nice wok. I've been thinking of trying the same thing...I'm off to pick up a couple cheap old floppy drives now.
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Old 20th February 2005, 09:35 PM   #4
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How do you make the motor run when the drive is not hooked up to a computer ?
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Old 20th February 2005, 11:00 PM   #5
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pins 12 and 16 need be conected to the ground pins (all the odd number pins 1-3-5 etc) or -ve terminal of the 4 or 5volt battery

ill be doing a picture session on my web site in the commin days

with the variable speed control fitted
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Old 23rd February 2005, 06:36 PM   #6
SvErD is offline SvErD  Norway
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Interesting!

How strong is this motor? What do you plan to use it for?
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Old 23rd February 2005, 08:12 PM   #7
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hi m8ty

Power from these floppy drive motors varies from unit to unit ...all seem to be able to pull inner and outer platters of standard weights ...e.g. linn / thorns etc

You can hold the motor and stop it dead...the unit has built in stall control...reconnect power and its on again


The main feature of concept here is that the power supply to drive the motor is a cell phone battery.... you have to spend a lot of cash to better a battery supply

Plus the motor only uses a tiny current...they are very efficient


And new type mobiles use lithium polymer and lithium ion batteries.... your phone charger can power your turntable

basic pictures are on my web site ....more to follow this week

best wishes
j7
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Old 24th February 2005, 06:20 AM   #8
tmblack is offline tmblack  United Kingdom
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Does it matter if you use a 3.5" or 5.25" floppy drive?

Tom
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Old 24th February 2005, 08:07 AM   #9
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This is a project Ive been waiting for! So damn cool (and cheap)!
Please finish the guide soon, Audioorigami, please

I have a plinth, a Mayware formula4 mk3, Linn LP12 subplatter w/ bearing + subchassis and an Originlive platter.
I am just missing a motor and control circuitry.

I tried a couple of dc motors with LM317T, but the speed kept wandering ( so I thought "sod it" and put the almost finished TT away a couple of months ago).
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Old 24th February 2005, 08:08 AM   #10
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hi tom

the new type floppys are what i have gone for ...simply coss they very easy to find

infact the old 5inch floppys are much better because they used bigger stronger motors...its the same wireing to make them work ...and slightly more ma to drive them ...so yes the 5 inch type are even more perfect....again every manufacter has made its own types ...so half the fun is opening the unit to see

these units are all negatively - triggered....
pins 12 and 16 are conected to the - of the battery pins 1-33 are all - as well....you cant do the unit any harm with a 4 or 5volt (mobile phone )battery...so dont be scared to try out things

the 12volt circuit is not needed in our use ...only the 5 volt side
12v (yellow) and 5v (red)...although a 12v battery could be used if you wanted with a drop down 5v regulator

i will have some time to photo my test unit with vary speed and wireing ill post tonight

so get out and grab some junk out your bin


best wishes
j7
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