I've had my geddon-esque psu running constantly for a few days, but still not listened to it. I was getting 95Vac to the motor given the 140Vac coming from the transformer and 4K series resistance. I have read that the linn motor is quietest with a 65Vac supply, so now increased the series R to 10K which has brought me down to almost exactly 65Vac.
The weird thing is that I was measuring a lower Vac after the 0.2uF cap with the higher voltage supply (about 85Vac vs 95Vac) but now that I've increased the series resistor to 10K I'm reading a higher Vac after the cap than before it (71.5Vac vs 65Vac). With about 6K series resistance I was getting similar voltages on the two phases.
Is this because my meter is rubbish, or is this as it should be? If the meter is accurate do you think I'd be better with the 6K series R and balanced voltages on the two phases, or 10K series R with unbalanced but lower voltages?
The deck struggles to start with 10K series R but doesn't need a helping hand - it gets there on its own
The weird thing is that I was measuring a lower Vac after the 0.2uF cap with the higher voltage supply (about 85Vac vs 95Vac) but now that I've increased the series resistor to 10K I'm reading a higher Vac after the cap than before it (71.5Vac vs 65Vac). With about 6K series resistance I was getting similar voltages on the two phases.
Is this because my meter is rubbish, or is this as it should be? If the meter is accurate do you think I'd be better with the 6K series R and balanced voltages on the two phases, or 10K series R with unbalanced but lower voltages?
The deck struggles to start with 10K series R but doesn't need a helping hand - it gets there on its own
Last edited:
TD150 motor supply
Take a look at this regenerative PSU: Digital PSU and Tach
DDS circuitry provides low distortion, extremely accurate (35µHz steps) sine wave. Front panel selectable voltage reduction after platter reaches speed, soft start ramps the frequency to reduce "burn out" on the belt.
Can be used stand-alone or with the digital tach for quartz locked accuracy with a belt drive.
Take a look at this regenerative PSU: Digital PSU and Tach
DDS circuitry provides low distortion, extremely accurate (35µHz steps) sine wave. Front panel selectable voltage reduction after platter reaches speed, soft start ramps the frequency to reduce "burn out" on the belt.
Can be used stand-alone or with the digital tach for quartz locked accuracy with a belt drive.
Having a higher voltage after the capacitor is normal, you have a resonant LC circuit with the motor inductance.The weird thing is that I was measuring a lower Vac after the 0.2uF cap with the higher voltage supply (about 85Vac vs 95Vac) but now that I've increased the series resistor to 10K I'm reading a higher Vac after the cap than before it (71.5Vac vs 65Vac). With about 6K series resistance I was getting similar voltages on the two phases.
Is this because my meter is rubbish, or is this as it should be? If the meter is accurate do you think I'd be better with the 6K series R and balanced voltages on the two phases, or 10K series R with unbalanced but lower voltages?
The deck struggles to start with 10K series R but doesn't need a helping hand - it gets there on its own
I prefer to have the two windings at the same voltage as any difference causes vibration
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.