Search found 211 matches

by Smonson
Sat Dec 08, 2018 9:31 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

As a mad idea, could you double the length of your ribbon cable on your board and try tests again ? Make sure PSU is at 5V or even 5.2V. It worked perfectly for at least ten minutes with a 10cm cable (no bad reads) - when I increased it to 12cm it wouldn't even boot up once. Crashes immediately wit...
by Smonson
Fri Dec 07, 2018 10:09 am
Forum: ELECTRONICS
Topic: Tip restorer testing
Replies: 13
Views: 152

Re: Tip restorer testing

I don't know if anyone else does this, but after replacing my last ruined iron a few years ago I heard this advice, which I've been following since... after turning the iron off each time I use it, I coat the tip in solder to protect it from oxidising. By the way, soldering iron tips aren't solid ir...
by Smonson
Thu Dec 06, 2018 12:27 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

Haha, I'm sure my boss would love it, and everyone under 30 would be confused!
by Smonson
Thu Dec 06, 2018 12:20 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

Will do! ...soon, but not for a couple of nights, I have my work Christmas party tomorrow.

I can't actually set the voltage - my bench power supply can only supply 1.5A and the ST is just a bit too much for it. So I just have the ATX power supply which is fixed.
by Smonson
Thu Dec 06, 2018 11:19 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

Oh, right. That was a DC offset. On the scope I saw occasional noise on the HDMI board ground of up to about +/- 650mV relative to PSU ground. But that shouldn't affect the level shifting buffer direction signal, I think, as it's localised to the mod board only.
by Smonson
Thu Dec 06, 2018 10:00 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

I measured a differential of around -4 millivolts between the FPGA board to the chassis ground (measured off the big electrolytic near the power supply). Not too bad considering the whole mod draws a lot of current (over 300mA).
by Smonson
Thu Dec 06, 2018 9:14 am
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

Sorry to hear about your CPU Icky. That really sucks.

Also I ran my machine on an ATX PSU at 5.06v for over fifteen minutes, but unfortunately didn't experience a single bad read. Ah, well.
by Smonson
Wed Dec 05, 2018 11:55 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

This gives me hope that I might be able to reproduce the issue here, by using a different power supply. Excellent!
by Smonson
Wed Dec 05, 2018 11:32 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

Icky wrote:
Wed Dec 05, 2018 11:29 pm
Thought I would give this a go too.

So I started at 4.3V and although my floppy failed to work the board dropped to the desktop and has been sat there stable. No resets.
Now that is interesting.
by Smonson
Wed Dec 05, 2018 1:07 pm
Forum: HARDWARE DISCUSSIONS
Topic: Project: HDMI/DVI out for STFM
Replies: 396
Views: 21568

Re: Project: HDMI/DVI out for STFM

I'm really sorry for not being able to allocate more time to it atm ... Don't be, it's awesome that you've already done so much to help. One thing I'm not following, is if there is a drive problem on D9, why would it work on some boards but not others? Just another piece in the puzzle. What I know ...