The Sinclair QL Forum

But the input to the 5V regulator should be about 9V DC I always thought (and have measured - when the QL is on). The regulator will work if the voltage is about 1-1.5V above the output voltage of 5V.

Yes - if using a multimeter - put the black lead on ground - a good place that's convenient is the modulator housing, and then use the red probe to take your readings - but if the voltage you are measuring is AC - then you will need to switch the multimeter to AC range for that reading. You will get...

ditto - and I like the Olimex version and the metal case you can get for it too.

I keep seeing those advertised - I've got a couple of the lilygo boards already - and they are wonderful little things - but I am struggling to justify why I might need this one

The DeOxit is an excellent contact cleaner and lubricant for contacts - but not the best choice for general lubricating. As you said Derek - a good "light oil" is what's needed, but I think 3-in-1 may be too much even. Generally lubricants intended for watches / sewing machines etc would b...

This is the stuff I use - excellent lubricant for small engineering projects, motors, etc, where you just need a small amount.

https://hobbylubricants.com/slug-slime/

almost certainly 'flexing' of the main board is probably exposing a dry connection or a chip not seating properly in a socket. Remove Ic's that are socketed - clean the legs with a deoxidizer - the stuff people use for their guitar jacks is excellent but expensive and re socket them. Try the board a...

I was born just down the road - and moved away then came back to live in Camberley for a while. I remember sending a QL back to that address for repair - and got upgraded ROM's out of it

oh - down the A30 near the white elephant - probably where the car sales place used to be...