On 16/04/2019 07:32, wrote:

Hi All,

As some of you are aware, I have an old Sony Midi system complete with turntables.

In recent years, the only thing Ive used the main boxy bit for, is to provide 12V to drive the turntable. Id like to feed it from something a bit more compact. But as usual, have zero budget.

Ive taken the bottom of the turntable and discovered
It has a 9 point Something volt motor (it also has an auto
Arm liftty and Putty away mechanism).

I checked the power out from the big box, and its a little over 12V. I had a dig in my PSU box and the nearest Ive got claims to be 13.1 V.

Does the team think thats near enough? Or do I need to get Id down? If so, could I get away with adding a diode (and resistor (value?)?) in series?

If not, could I add a 12V regulator? Or would I need more than 13V to feed the regulator?

TIA

Chris



I'd *expect* it to be OK, but would be tempted to try to measure the
voltage from the original PSU on-load, and see if it's 12v then, and get
a PSU as close to that as possible, or use a higher PSU and a regulator.
Apparrently you'll need at least 14.5v to drive a typical 12v regulator
and *guarantee* 12v:

https://electronics.stackexchange.co...-input-voltage

I'd expect the motor drive to be regulated in the turntable, so I'd
expect the main problem is not burning that up :-)