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Digital Turntable Tachometer and DDS based PSU

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#42
RoadRunner Digital Tach on ClearAudio Innovation Wood

Surprisingly, a lot of users are installing the RoadRunner tachometer on very high end tables; even with the factory power supply they are finding the speed is off, but easily corrected using the tach:

"I installed the RoadRunner on my ClearAudio Innovation Wood today. Talk about a super slick install, looks like this was custom made for this table.

To my surprise all 3 speeds were off (higher) by at least 1.5 rpm 😉"
 

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#43
I'm shipping a fair number of the tachs overseas, so I've sourced a switching power supply for the RoadRunner that has a universal input (100-240VAC) for those installations. Eventually, it will replace the linear supply for domestic apps as well.

The Falcon PSU has always shipped with a universal input SMPS wall adapter.
 
#44
We've made a change to the firmware on the Falcon PSU when operating at 78 RPM: Since of a lot of the original 78 RPM recordings are notoriously off speed, there was a need to adjust the output frequency over a greater range. Previously, the Falcon was adjustable to ±1.0RPM when 78 RPM was selected (same as 33 and 45 RPM mode); with the new firmware, the speed adjustment was increased to ±6.0 RPM for 78 RPM mode only. This gives an effective speed range of 72 to 84 RPM in 0.1 RPM steps (calibration mode still has the 0.01 RPM steps). Firmware version for this feature is v1.12.
 
#53
Picked up my Falcon and RoadRunner last night. I think I'm going to have to get creative with the mounting of the magnet and pickup. There's not enough space between the plinth and platter on my xPression III turntable to mount according to instructions. The inner area of the platter is recessed so maybe i can mount things further inside the platter. That means I'll need to have make sure there's enough space to run the cable between the platter and plinth.

Will report back.
 
#56
So I was able to get the Roadrunner installed without too much trouble. I ran the sensor wire up through the motor housing and through the plinth. I then stacked up some 3m double sided tape (3 layers) to the the sensor enough height to read the magnet mounted on the inside of the recessed center area of the platter.

The plastic around the L-shaped miniplug that connects to the sensor needed a little shaving down that it didn't hit the under side of the platter.

My system is very modest compared to those that are showcased on the Phoenix Engineering website but it suits my purposes and I think it sounds great.

Cheers,
Scott
 

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#58
Thanks for the compliments. So, yeah, I think there is enough room under the subplatter. Actually, I hadn't even thought about mounting it there. Do you think there would be benefits to doing so? I just figured getting it as close the edge of the platter would be best...

Thanks,
Scott
 
#59
In theory, the larger the diameter the smaller the triggering error so the more consistent the reading of the tach should be, but I have not measured this to see how much difference (if any) it makes. I have had users who did mount the magnet to the subplatter (see review on page 1 of this thread by Big Kahona) as a matter of convenience or preference and it seemed to work just fine.
 
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