DIY power supply for Technics SL1200/1210

Anubisgrau,

Don't know about a D.I.Y PSU, but Sound Hi-fi do a rather nice one which I'll be checking out tomorrow along with the Jelco arm above :)

Marco.

yep nice, but a nice price too - it really makes me wonder is it all really worth it when you can buy a SP-10 with a decent arm (like AT 1012 i've seen recently) for around 1000E with an acceptable plinth....

or like this, with SME II in a funny board -cum- plinth:)

http://cgi.ebay.de/TECHNICS-SP-10-MK...1%7C240%3A1318

I'm very interested in hearing your reports on the new soundhifi psu marco. If it 'blows the ps1200 out of the water' please don't tell me - i've only had it in a couple of weeks :(
I thought i'd got my deck all pimped then someone comes along with the new black. whatever happens, i'll be sticking with my current setup for a long while yet. as good as the new improvemnets may prove to be, i have plenty of goodness in my 12 to keep me going for a while

Quote:

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Originally Posted by anubisgrau

is there a schematic for a DIY PS?

i'm wondering if there was something at DIYaudio on this?

i'm gonna check it out straight away

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You can simply use a standard 1.5A variable voltage reg. IC such as LM317. This is what the Sound Hi-fi unit apparently uses. Schematics are everywhere - look at the data sheet for starters. Also see post no. 7 in this thread.
John

What is the advantage of working around the existing regulator-couldn't you plug in an outboard 34 v dc at, say, C1, thereby maintaining the strobe and light? It seems this would be better than keeping the stock ps for the lights only, since you've then eliminated the advantage of moving the transformer out of the chassis.

not questioning your methods-I don't know much, just here to learn.

frogspit -

Yes you could certainly connect a 34V DC supply as you suggest, or at the rectifier diodes as KAB do.

The advantage of bypassing the internal reg is that its performance is not considered to be all that great - evidence of that can be seen here:http://www.soundhifi.com/sl1200/SL1200%20PSU.htm
I haven't compared the sound performance of these two approaches, though.

I never use the light or the strobe so I don't connect the stock power supply at all. But if you want to keep the light and strobe and still bypass the internal supply including the regulator you could connect a 21V DC regulated supply in a different way: Just remove the wire that leads from the emitter of Q1 to J3, and connect the 21V at J3.

John

The strobe still works with the Sound Hi Fi mod. The best of all worlds?

Dave

Fast, too!

I'm working on my own SL-1200 MKII mods-I'd noticed that the specs matched the SP-10 MKII, so I'd thought I'd give a try at building a 'poor boy SP-12'. To that end, I bought a used and (relatively) inexpensive deck, and I'm giving it a go. My objectives:

*new plinth

*ability to use two arms, including a 12"

*outboard ps

*ability to turn strobe on and off (I'm using a toggle on the rear of the ps for main power, and converted the switch on the strobe to turn the strobe on and, yes, off)

*eliminate pitch slider

I'll be veneering it with maple to match the solid maple ps case.

BTW, the walnut plug above the strobe hides access to the 'VR301' which I moved off the pcb-this will allow me to tune the speed while the platter is turning, or even with the stylus in a groove.

Question: before I veneer, does the stylus light actually work? i.e., does it illuminate the outside grooves well enough to drop needle to record in a darkened room? I'm rethinking it's implementation here, but if it's useful, I'll probably maintain it.

Dave, I'm sure your ps is wonderful, but I'm seeing what I can do here with as much diy as possible. So far, since I had the materials around, cash out of pocket has only been the price of the tt-150.00US. With IEC and umbilical connectors, footers, new ps parts, etc., I'll probably be around 250-300. Not counting tonearms, of course.:)

i actively use my cueing light (i'm not scared of it degrading sound) and it does the trick.
your project looks great - can i put my name on the list for one?

Thanks 'muffinman'-

The light shall stay.

I like the resemblance between your pooch and my 'Mack' record weight.:)