Lurkers debut post. I’m copying lmnc rotating crystal Palace thing. I’ve made a 4 input job previously. Latest iteration has 8 inputs. Like the lmnc original I want input 1 to cascade to 2,3 then 4. I’ve got that going but each subsequent inductor gives a weaker signal until by the time it gets to 4 it’s barely audible. Lmnc has some opamps or summink in between to erm, normalise levels to each inductor. I’m strictly a copier and can’t work out how to do this without stacking gain upon gain until inductor 4. Does any of this make sense? I’m not a noob exactly and have cobbled together many circuits from schematics but this is baffling me. Any clues what I should do next. Fanx.
5 Likes
If you include a schematic, it may be possible to see what signals need to be amplified and how to do that.
3 Likes
Tru. I’ll pop a shoddy diagram up after work. Thanks and soz
I’m losing signal as it cascades down from input 1 to 2 3 and 4. Perhaps is should just sling a basic amp in between each input. Even just a transistor with a pot for gain control would do. Seemed more complex yesterday
and can’t work out how to do this without stacking gain upon gain until inductor 4.
From the video I understand that all jacks are interconnected via the switch in the jack (so electrically seen they are in parallel to each other unless a jack is inserted) and each will lead the signal to its respective buffer and from that buffer to its respective coil. Interconnecting the jacks via the switches makes it possible to send a signal to all (or a series of jacks) interconnected jacks so each coil should have the same signal level assuming the volume controls of each opamp is set to the same value.
If in your case you have a signal that goes down in amplitude they opamps are not given the same signal. I think it is wise to check the wiring of the jacks.
Does this make things a bit more clear to you?
1 Like
Thank you Jos. I had not installed any buffers and just connected the switched Jack’s to each other. When I plugged a signal into input 1 I could pick it up at 2,3 then 4.just as intended except the volume at each subsequent inductor was less. I think after sleeping I have decided to stick a very basic transistor amplifier between each stage with a pot to hopefully push levels back up as they proceed down the line of inductors. I trust this will work for me and I have overbaked the complexity of what was needed. Thanks for your input and sorry for my diagram hastily scribbled at the office.
Hey you all !
Has anyone of you progressed further in getting near to a real Crystal Palace ?
Would be so much fun to have one. But my skills are yet too limited to accomplish that journey myself.
Would be interested what happened in the mean time, and if you would be down to share information and or sketches you did on accomplishing a “clone” 