1958 Turntable from the Black Forest - 5: Turntable speed sample testbed with Arduino UNO

RE: 1958 Turntable from the Black Forest - 5: Turntable speed sample testbed with Arduino UNO

Jan Cumps — Sun, 29 Mar 2015 20:54:54 GMT

Preview of the table playing a record, with the Arduino doing a so-so job to maintain a constant speed:

[View:https://www.youtube.com/watch?v=jFj4FkEMeFI:520:333]

RE: 1958 Turntable from the Black Forest - 5: Turntable speed sample testbed with Arduino UNO

Jan Cumps — Fri, 27 Mar 2015 00:43:57 GMT

I made a pcb for the speed sensor circuit. Expected to arrive in 15 days from oshpark

[View:/resized-image/__size/321x221/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-241fc173-f22a-4872-8d94-ac4555a73611/contentimage_5F00_179243.png:321:221]

I didn't use drill holes. It's going to be glued against the underside of the table.

RE: 1958 Turntable from the Black Forest - 5: Turntable speed sample testbed with Arduino UNO

Jan Cumps — Thu, 26 Mar 2015 22:07:45 GMT

I'm getting the first pulses from the speed sensor:

[View:/resized-image/__size/620x827/__key/commentfiles/f7d226abd59f475c9d224a79e3f0ec07-241fc173-f22a-4872-8d94-ac4555a73611/7357.contentimage_5F00_179242.jpg:620:827]

RE: 1958 Turntable from the Black Forest - 5: Turntable speed sample testbed with Arduino UNO

DAB — Thu, 26 Mar 2015 19:26:35 GMT

Nice update.

I am not sure just how constant the speed must be to get good sound reproduction.

I do like your strobe disk print. I like quick and dirty engineering fixes.

DAB

RE: 1958 Turntable from the Black Forest - 5: Turntable speed sample testbed with Arduino UNO

mcb1 — Thu, 26 Mar 2015 05:51:05 GMT

Jan

Nice writeup and great link for frequency/period count.

I presume your feedback loop has some slugging in it to stop it constantly hunting.

My old Dual turntable has cast marks around the platter and a 50Hz light shining on it for adjusting the speed.

Mark