Motor drive for the linn Lp12 turntable with two variable speeds, 33 and 45 RPM. And the third generation of the original motor power supply belongs to the same technical level. High reliability, high precision. Global shipping,
supply voltage AC 115v or 230V. The contents of the first picture are the supply list. Provide according to the buyer's location. Or tell me.
Please contact me if you have any questions. (PSU, connecting cables, switches, and fixed circuit board)
Please note: AC power cables are not provided to reduce weight. Use universal cable wires.
The weight after packaging is 1.9Kg.
Overview
The Motor Controller is a dual fixed frequency, dual phase crystal contolled oscillator that is used only with Linn turntables. It has one front panel button to switch between 33/45 RPM (long press) and between standby and run (short press). There is a power switch on the back turn the unit on/off. is designed to work with 230VAC inputs and 50Hz 115VAC motors on the output.
Circuit Description
The controller uses two crystal oscillators (3.2768/4.42268 MHz) to generate the frequency for 33 and 45 RPM. The selected crystal frequency is divided by 65,536 to create 50Hz or 67.5Hz (33/45 RPM). U1B/D and U2B/C form a 8 Pole LPF/HPF with cutoff frequencies of 20Hz and 90Hz. There are separate level controls for 33 and 45 RPM, but the output level is fixed during operation. U2A delays the output of the filter by 90° and U3 selects different time constants for 33/45 RPM to maintain 90° over both speeds. The output of the LPF and the phase delay drive U1A/C which drive the HV output amps. The output of the HV amps are capacitively coupled to the windings of the motor.
Specifications
INput Power................................115VAC---OR---230AC
Nominal Speeds............................33 and 45 RPM .
Speed Stability..............................0.01% (100 PPM)
Output Power................................3W
Reduced Voltage...........................60VAC
Motor Connection..........................115VAC