Hello ,
I'm new here , following the simple DC motor control topic for some time now .
I gathered the info as much as possible and went to build it on a eurocard printboard
with soldering islands . here's where I am right now :
Motor Maxon A-max 110173 . 8,26 Ohm DCR
NPN : TIP31C
Opamp : TL071CN
47K for both R43 & R44
R45 target somewhere between 22K & 24K . using a 50K trimpot
R46 at 2,7 Ohm
R38 & R39 at 2K2 . using trimpot as well
Zener 8.2 Volt
Transformer 13 Volt - 0 - 13 Volt ( 0.2 A ) AC terroid
PR trimpot 10K ( no series resistors ) Single adjusting string for 33RPM only .
It works a charme in therms of adjusting unloaded motor speed , and see the circuit is working when loading the motor spindle with my finger
.. i.e. output voltage increasing
when load applied .
Here some questions :
How do I choose motor pulley diameter / ratio .. in respect to voltage ? I assume I should
aim for lowest motor RPM ( mech noise ) ?
Also : I can't find any PS schematic ?? I know it's a simple one , but perhaps I'm missing some
important things at this one ?
Hopefuly someone is able to put me on the richt track with this . another thing I need to do is printing the strobe disk etc.
Well , it has been a real joy to build so far .. time to move on and get the whole thing driving my platter someday soon .
Thanks in advance ,
Paul