One way to bring a Philips 212 turntable back to life

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lens42
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One way to bring a Philips 212 turntable back to life

Post by lens42 » 13 Feb 2019 08:26

If you have an old Philips 212 (aka GA212) turntable with dead buttons, you might be interested in how I brought mine back to life with an Arduino micro-controller. It was probably more work than it was worth, but now that's it done, I don't care :-)
https://lensprojects.wordpress.com/2019 ... r-upgrade/

Pauw
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Re: One way to bring a Philips 212 turntable back to life

Post by Pauw » 13 Feb 2019 09:57

Very impressive .....very!!

Vinylfreak86
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Re: One way to bring a Philips 212 turntable back to life

Post by Vinylfreak86 » 13 Feb 2019 10:44

It was worth. Good job done. Even if these models were consumer level when new, they are very quality made inside. You cannot find so sturdy electronics on new turntables, not on cheaper stage.

HAMISH119
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Re: One way to bring a Philips 212 turntable back to life

Post by HAMISH119 » 13 Feb 2019 15:32

lens42 wrote:
13 Feb 2019 08:26
If you have an old Philips 212 (aka GA212) turntable with dead buttons, you might be interested in how I brought mine back to life with an Arduino micro-controller. It was probably more work than it was worth, but now that's it done, I don't care :-)
https://lensprojects.wordpress.com/2019 ... r-upgrade/
Outstanding work!! Truly inspirational! =D>

:idea: I look forward to your REV 3 of the circuit board, which re-purposes the 'STOP' function (button) to a 'SPEED' selection (78 rpm) function (tap on/tap off 33, 45 & 78) and replaces the speed adjustment potentiometers with switches (for + & - adjustment) etc. The possibilities are endless! :idea:

N.B. (for those inspired to pursue the concept further)
With minor circuit changes (R23 - there may be more changes required), it should work on a Philips GA312, GA222, GA406 and their derivatives.

Good Luck!

Pauw
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Re: One way to bring a Philips 212 turntable back to life

Post by Pauw » 13 Feb 2019 15:54

If I understand it correctly the 78 ability of a GA 212 is not electrical it is physical and required a movement of the belt...now maybe you can modify the electronics to do this.....

Coffee Phil
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Re: One way to bring a Philips 212 turntable back to life

Post by Coffee Phil » 13 Feb 2019 19:35

Hi lens42,

Welcome to the forum!

Good Job!

I am also an "old analog guy", but probably more long in the tooth than you. Before I'm under the grass I need to use a micro-controller in a project. Also I need to learn CAD circuit card layout and schematic capture. You are inspiration for this.

I finishing up a controller for Kenwood KD 500 / 550 direct drive machines. They use a proprietary chip with a pulse averaging frequency to voltage converter. I am emulating that with a 555 timer and op amps. My construction is "dead bug" style. This is OK for one off projects but it would sure be nice to have a board to stuff if I want more units.

Congratulations to you and hopefully you will inspire me to develop the skills to do what you did before I'm under the grass!

Phil

lens42 wrote:
13 Feb 2019 08:26
If you have an old Philips 212 (aka GA212) turntable with dead buttons, you might be interested in how I brought mine back to life with an Arduino micro-controller. It was probably more work than it was worth, but now that's it done, I don't care :-)
https://lensprojects.wordpress.com/2019 ... r-upgrade/

HAMISH119
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Re: One way to bring a Philips 212 turntable back to life

Post by HAMISH119 » 05 Mar 2019 11:32

Pauw wrote:
13 Feb 2019 15:54
If I understand it correctly the 78 ability of a GA 212 is not electrical it is physical and required a movement of the belt...now maybe you can modify the electronics to do this.....
I believe you're referring to the 'redneck' 78 rpm method, which involves running the belt on the outer flanges of the motor pulley and requires an unlimited supply of belts.

Here's an example of the 'correct' method.

Good Luck!

Pauw
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Re: One way to bring a Philips 212 turntable back to life

Post by Pauw » 05 Mar 2019 11:59

Does this method actually change the speed of the motor or does the action of the black knob on the left just raise the belt?

HAMISH119
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Re: One way to bring a Philips 212 turntable back to life

Post by HAMISH119 » 05 Mar 2019 12:39

Pauw wrote:
05 Mar 2019 11:59
Does this method actually change the speed of the motor or does the action of the black knob on the left just raise the belt?
It's purely electrical! :shock:

NOT 'redneck' mechanical! :roll:

Good Luck!

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