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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Revox B77 REAL time digital counter conversion - part 1 - the mechanicals..
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<blockquote data-quote="marcochezzi" data-source="post: 988789" data-attributes="member: 21001"><p>Right, so using my Iphone and a strobe based rpm calculator app, I was able to identify the pulley revolution at 3 full turns per second.</p><p></p><p>So the next (technically last) mechanical bit of machining left to do is cut the slots on the sensor wheel side of the pulley</p><p></p><p>Using a 3mm cutter, I was able to cut 12 slots for the optical coupler.</p><p></p><p>Therefore, since I have 3 revolutions per second during play x 12 pulses per revolution = 36 pulses per second played / recorded.</p><p></p><p>I can now electronically divide the 36 pulses by a factor of 36 , and get to a 1 pulse per second solution, which is effectively my real time counter clock signal, done, chuffed..!!</p><p></p><p>Here the pulley arse side up on the dividing head this very morning, ready for the slotting..</p><p></p><p></p><p><img src="https://i.imgur.com/xeD7B6h.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Almost done.. this is generally where things go pear shaped with me.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" />ray:</p><p></p><p></p><p><img src="https://i.imgur.com/x27sZBr.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>And done..!!!!!</p><p></p><p></p><p><img src="https://i.imgur.com/SUaW0FV.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Here you can see her clearly in place..</p><p></p><p></p><p><img src="https://i.imgur.com/EjxcJfg.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="marcochezzi, post: 988789, member: 21001"] Right, so using my Iphone and a strobe based rpm calculator app, I was able to identify the pulley revolution at 3 full turns per second. So the next (technically last) mechanical bit of machining left to do is cut the slots on the sensor wheel side of the pulley Using a 3mm cutter, I was able to cut 12 slots for the optical coupler. Therefore, since I have 3 revolutions per second during play x 12 pulses per revolution = 36 pulses per second played / recorded. I can now electronically divide the 36 pulses by a factor of 36 , and get to a 1 pulse per second solution, which is effectively my real time counter clock signal, done, chuffed..!! Here the pulley arse side up on the dividing head this very morning, ready for the slotting.. [IMG]https://i.imgur.com/xeD7B6h.jpg[/IMG] Almost done.. this is generally where things go pear shaped with me.. :pray: [IMG]https://i.imgur.com/x27sZBr.jpg[/IMG] And done..!!!!! [IMG]https://i.imgur.com/SUaW0FV.jpg[/IMG] Here you can see her clearly in place.. [IMG]https://i.imgur.com/EjxcJfg.jpg[/IMG] [/QUOTE]
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Audio and Video Talk
Reel-to-Reel & Cassette Tapes
Revox B77 REAL time digital counter conversion - part 1 - the mechanicals..
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