There's a bloke on Lenco Heaven who put together a DIY variable frequency drive for Lenco tables, but he no longer makes them apparently. Someone posted the layout files a while back and I downloaded the Gerber files for the PCB and it works pretty slick. Maybe some folks here would be interested in developing this kit into a group buy? You can download the instructions and bill of materials Here
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It there enough current drive from those two chips?
I would hope so, in fact I think it is overkill. The TD7293 chip amps are 100W each and he is running them in parallel. The kit requires a step xfmr to boost the output to 115/230VAC.
The XR2206 is not very accurate in frequency.
Much less of the mains, in Europe.
Agreed. I imagine there is some drift with temp as well, but this is a DIY project. If you want better stability and accuracy, you should be looking at a synthesized supply; there are a number of them available commercially.
My understanding is someone else did this version of the PCB layout when the original boards were no longer available. I also understand they did some improvements. This is not Nigel's board layout.
AFAIK, the rest of the design is in the public domain. It was done as a DIY project and it would be nice to see it continue that way.
AFAIK, the rest of the design is in the public domain. It was done as a DIY project and it would be nice to see it continue that way.
Someone posted the layout files a while back and I downloaded the Gerber files for the PCB and it works pretty slick.
Schematic?
Schematic?
Circuit diagrams can be downloaded here:
https://www.dropbox.com/s/oywhzic8z1m4hj2/cct_1.6#1.pdf
https://www.dropbox.com/s/d8fl5isgbiha6pk/cct_1.6#2.pdf
https://www.dropbox.com/s/uggi1hd51flyhxi/cct_1.6#3.pdf
Circuit diagrams can be downloaded here:
I am not able to download. Use forum Manage Attachments.
Not exactly DIY since Kevin is not interested in selling kits, but maybe has some features worth considering. Kevin Carter (of K&K Audio) and his friend Trent designed this TT PS. I have one of the beta units. It has separate outputs for each phase and a fine adjustment for the phase angle (requires removing the capacitor and rewiring the motor). Besides frequency adjustment there is also amplitude adjustment. I find that using the lowest output voltage that keeps the record spinning improves the sound of my set-up.
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My understanding is someone else did this version of the PCB layout when the original boards were no longer available. I also understand they did some improvements. This is not Nigel's board layout.
AFAIK, the rest of the design is in the public domain. It was done as a DIY project and it would be nice to see it continue that way.
As far as I am aware this design is not in the public domain. This is a clear rip-off of someone else's work.
Nigel was nice enough to ask the original designer of the Lenco speed controller for permission develop this in to a well documented, easy to assemble PCB project. This was/is a non-profit project which should not be abused like this.
As far as I am aware this design is not in the public domain. This is a clear rip-off of someone else's work.
Nigel was nice enough to ask the original designer of the Lenco speed controller for permission develop this in to a well documented, easy to assemble PCB project. This was/is a non-profit project which should not be abused like this.
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As far as I am aware this design is not in the public domain. This is a clear rip-off of someone else's work.
The links to dropbox are by definition, public domain. This is what Nigel had to say about the PCB layouts when posted on Lenco Heaven:
Not sure what your argument is then?True, the schematic, parts list, etc are in the public domain and anybody can re-lay the PCB if they want to, but at least they have to put some effort and some knowledge into doing so.
This was/is a non-profit project which should not be abused like this.
This is still a DIY project and no one is profiting from it. How is that abuse?
Hi all,
I spent a bit of time looking at options from my Rega turntable. In the end I went with a design by Meldano and the results are fantastic. I purchased a PCB, a pre-programmed IC and his software. The software is very simple but cool as it lets me set the speed selector buttons to what ever speed I want including setting a ramp up or ramp down rate etc.
Here's a link to Meldano's page krishu.de AC-Motorsteuerung mit uController
Kind Regards
Andrew
I spent a bit of time looking at options from my Rega turntable. In the end I went with a design by Meldano and the results are fantastic. I purchased a PCB, a pre-programmed IC and his software. The software is very simple but cool as it lets me set the speed selector buttons to what ever speed I want including setting a ramp up or ramp down rate etc.
Here's a link to Meldano's page krishu.de AC-Motorsteuerung mit uController
Kind Regards
Andrew
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Hi all,
I spent a bit of time looking at options from my Rega turntable. In the end I went with a design by Meldano and the results are fantastic. I purchased a PCB, a pre-programmed IC and his software. The software is very simple but cool as it lets me set the speed selector buttons to what ever speed I want including setting a ramp up or ramp down rate etc.
Here's a link to Meldano's page krishu.de AC-Motorsteuerung mit uController
Kind Regards
Andrew
That looks pretty cool, are there English pages? Prices? I'm too unilingually stupid to navigate that site.
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