File:Bantam answering machine Setting the motor speed (9572823569).jpg

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I marked a red line on the flywheel and illuminated it with my home-made LED stroboscope. The motor was powered by my bench PSU, and the preset on the motor speed control PCB adjusted to get the right speed.

Since the unit is used only for speech recording, this should be near enough. I can always re-set it later if I get a frequency test tape.
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Source Setting the motor speed
Author tony_duell

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by tony_duell at https://flickr.com/photos/43851301@N02/9572823569 (archive). It was reviewed on 23 September 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

23 September 2019

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Date/TimeThumbnailDimensionsUserComment
current00:05, 23 September 2019Thumbnail for version as of 00:05, 23 September 20193,648 × 2,736 (4.04 MB)Retired electrician (talk | contribs)Transferred from Flickr via #flickr2commons

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