The Sinclair QL Forum

The power supply diagram I made is on my website now - http://www.dilwyn.me.uk/docs/hardware/qlpsu.png - and has been altered to add the power supply label from a USA QL as well as a British one.

Next, can anyone help me with the details from a European QL? I presume the output voltage to the QL will probably be the same, but the nominal mains input details may be a little different to the British one.

I was a little surprised to find that this information wasn't already in the public domain, at least if it is I haven't found it yet. There are a load of photos of QLs and accessories on Urs's photo gallery website but haven't yet found a photo of the label on a European QL PSU.

dilwyn wrote: Next, can anyone help me with the details from a European QL? I presume the output voltage to the QL will probably be the same, but the nominal mains input details may be a little different to the British one.

Mine is originally from Finland and has the following information on the label:
IN: 220V ~ 50Hz. 0.22A
OUT: 9V. D.C. --- at 1.8A
OUT: 15.6V A.C. ~ at 0.2A

Mine (German MGG QL, Samsung made) says the same. And, in contrary to what is on the Computer label, it also says: "Made in England". So they are probably all the same.

Tobias

I got my transformer which i planned to use in QL but find a problem there's four wires coming out of the transformer two is 12vac and other two is 9vdc how can i connect those to QL because it only have tree pins, i know now the midle one is gnd(0V) but how does it affect if i connect dc gnd and one of the ac lines together, does my transformer go boom after that?

If you're building a whole new PSU, things get interesting. The QL on-board power regulation was never the best, but it's now approaching 30 years old.

You can safely feed >13.5v DC into the 15.6v AC line and it will work just fine. As soon as it hits the bridge rectifier inside, it's all the same.

Thanks for the information of the dc current it makes it little easier now to build new transformer.