Hi Guys,

I just thought I'd knock up a quick calculator for a turntable motor control system. You can go as deep as you want into topologies (From simple LM317-style regulators up to full-blown Buck/Boost/Flyback circuits) and if you need assistance on that, please email me at : liam(at)liammartin.com.

This would be a closed loop (ie. with feedback) system, so it'll try to keep the speed as constant as possible with respect to load.

The overall accuracy will depend primarily on the % of allowed variation around the reference voltage...although most switching regulators are accurate to within a few percent these days.

However, this is simply a calculator for the 'handy-to-know' ratios - contained herein are :

Platter vs Drive wheel RPM

Motor RPM + Drive wheel vs Platter RPM

DC-DC Controller Feedback Resistances based on the above.

If you spot a hole in the calculations, please let me know!

I hope this is of help.

Liam

I just thought I'd knock up a quick calculator for a turntable motor control system. You can go as deep as you want into topologies (From simple LM317-style regulators up to full-blown Buck/Boost/Flyback circuits) and if you need assistance on that, please email me at : liam(at)liammartin.com.

This would be a closed loop (ie. with feedback) system, so it'll try to keep the speed as constant as possible with respect to load.

The overall accuracy will depend primarily on the % of allowed variation around the reference voltage...although most switching regulators are accurate to within a few percent these days.

However, this is simply a calculator for the 'handy-to-know' ratios - contained herein are :

Platter vs Drive wheel RPM

Motor RPM + Drive wheel vs Platter RPM

DC-DC Controller Feedback Resistances based on the above.

**http://liammartin.com/Misc/TTCalc/Turntable_Driver_Calc.xls**If you spot a hole in the calculations, please let me know!

I hope this is of help.

Liam

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