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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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.
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.
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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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.
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?
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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That looks pretty cool, are there English pages? Prices? I'm too unilingually stupid to navigate that site.
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