How to Connect an External Dc Supply to the SL-1200/1210

[CageyH]

Thanks Martin, but I was actually thinking of re-enabling the switch so I can power off/on the deck as I was able to before.

I was intending to connect the positive from the external PSU through the switch. That means that I would need some wire to go back to the board to put the 21V back in.

I'll look at changing the Strobe so it's on the power switch, and see if I can work out how to connect it.

[MartinT]

I would avoid doing that if possible, Kevin, as routing your precious regulated DC through that switch would slightly compromise it. Better to switch off at the external power supply and use that switch to disable the strobe.

[CageyH]

Sounds sensible.
Thanks.

[CageyH]

Strobe now on the rotary switch.
While I was in the deck, I have also fitted a molex jumper across the pitch controls.
Two free mods completed, so now time to have a listen with no lights running to see if I can hear a difference in my modest system.

[MartinT]

Great. Enjoy the listening.

[synsei]

Thanks Martin, but I was actually thinking of re-enabling the switch so I can power off/on the deck as I was able to before.

I was intending to connect the positive from the external PSU through the switch. That means that I would need some wire to go back to the board to put the 21V back in.

I'll look at changing the Strobe so it's on the power switch, and see if I can work out how to connect it.

My switch is still in circuit with no ill effects at all Kevin. I wanted to keep this functionality as it is a pain in the arse, not to mention the back (I have a chronic back problem) to have to bend down to floor level to flip the power switch every time I want to use my TT

[Mike_New]

I do not think that using the rotary switch as the on/off switch will cause any problems at all. The switch is able to handle the current, and it is not directly switching an inductive load. Also we are handling DC so the extra length of wiring up to insersion/connection point will not cause any hum problems. I used this method on my test bed SL using the TS power supply with no problems.

[Sonic Incisions]

I have been asked by a respected member ov this forum to let you all know that the Timestep HE PSU instructions...(for my unit that arrived this week) Are dated Monday 21 June 2010. Instruction 10 states to fit the solder tag to the top right hand PCB screw.....Not to the bottom left screw for correct grounding as has been pointed out in this forum....
It would appear the "Designer" is adverse to any suggestion otherwise on the proper placement. As I had been reading how to install an external PSU on this forum, I have followed the correct advice..
Also the instructions make no mention ov removing the old PCB and regulator, only to remover the original mains lead and transformer to do a "Proper Job".
So now you know.....

[Cobra2]

How I used the stock switch, with external psu. (and had more Volts than needed, so I replaced one fuse with a 10+ ohm resistor, for added filtering)
I used the stock AC-cord, with a new (XLR)-plug to PSU.
Arne K

[TobesEtc]

Thank you Shuggie, I just used these instructions to install the DC PSU from Mains Cables R Us (www.mrcu.co.uk). I also used the picture Worrasf posted to keep my on/off control working, so thank you, too.

Immediately the hum at start up has gone, which is exactly what I wanted to achieve. Thank you everyone!