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Understanding

Technical guides

Eight articles on what happens between the wall socket and the platter of a belt-drive turntable: the power supply, the motor, the phase, the analysis of the current, the measurement of speed. They start from the physics. Where Isostase has an answer, it is stated at the end of the article, not before.

Turntable speed stability: motor, power supply and regulation

Wow and flutter, the role of the motor power supply, transmission through the belt: what makes a platter's speed vary.

Turntable motors: why 90° is not enough

The rotating field of a two-winding motor, why the ideal angle departs from 90° from one motor to another, and how to look for it.

Konstant FMD: what can closed-loop speed control add?

What the Konstant power supplies state, what is left unsaid, and the difference between open and closed loop.

A Transrotor Konstant alternative: what to check first

What changes and what stays the same when replacing the original supply, plus limits and compatibility.

Motor current FFT: what the spectrum says about a turntable

Harmonics, sidebands, trend over time: what the current analysis shows, and what it does not say.

Dual-motor turntables: why synchronisation matters

Load angle, load sharing, torque ripple and adjusting the phase between two motors.

How to measure the speed of a turntable

A contactless optical sensor, one measurement per revolution referenced to a quartz clock, what it reveals and where it stops.

Speed, wow and flutter measurements of a Transrotor turntable

Speed, wow and flutter of a Transrotor Zet 3 with Isostase, compared with two original power supplies: method, figures and limits.