audio-talk

That makes sense, it wasn't horribly bright. It would be nice if they put that in the datasheet.

The second question. I bought one of these for a mains on/off switch. It specifies a 12V supply for the LED but the datasheet isn't very helpful. Testing with a 9V battery (actually, down to just 7V) the LED lights. So I'm not sure of the relevance of 12V, and therefore how I control the brightness ...

I really should get on and get this thing boxed up.

A couple of questions for the panel. The umbilical - presumably I really should use stranded wires? The smallest diameter wires I have are solid core and there isn't space in the screened tube to thread the required number of stranded wires that I ...

Nick wrote: Fri Mar 14, 2025 6:43 pm

I did add gate stoppers

They are not gate stoppers as you may imagine, they are to limit forward current if the gate junction becomes forward biased.

jack wrote: Wed Apr 09, 2025 3:27 pm A lot will depend on how good your GP is and what sort of stress they are under - they're human too ...

simon wrote: Wed Apr 09, 2025 1:38 pmI suspect it points to deeper challenges in the NHS as much as medicine by rote.

The procedure , which I understand is the norm, is to weed out time wasters, idiots and hypochondriacs and refer on the rest to a specialist .

That, sadly, has a certain resonance re. specialists.

At one point, after a period of being poorly for maybe 18 months and not responding to treatment ...

pre65 wrote: Wed Apr 09, 2025 2:08 pm I was thinking of how to reply to the comments about GP's and this above from Simon just about sums up my thoughts.

Sorry to hear that Phil

FWIW, which is pretty much the square root of FA, my experience with my GP over the last 4 years of my health "challenges" has been closer to them reading the Haynes manual than independent thought and research :-(.

One of the issues I got resolution to a year ago I've been discussing with my GP ...

I soldered up to two boards a while back, even 1206 parts was a bit small. I've been putting off testing though as I haven't felt that great, and bad things happen when I turn a scope on.

But I can't put it off any longer, I need to check what happens. So, I presume I should set up like this:

Sig ...

Reminds me of my Madness amp - 26 with gyrator load cap coupled to 10Y IT to 300B. That was a BIG amp

I really should concentrate on boxing a few things up, but playing is much more interesting. Here's the next experiment.

Back to the paralleled LSK170s. I had some boards fabbed previously to allow two parallel jfets, but I think I'll go the whole hog with 4 :-). This is based on the Pearl 3 phono ...

Distance does help, no surprise. Once the trafo and raw DC section are more than 250mm away from the SuperRegs and audio circuit the hum is very much reduced. It's still there, but now the volume pot needs turning up to about 80% to hear it.

There's another mechanical hum coming from somewhere now ...

47k. Actually 39k as that's what I use with the 103 Pro and step up transformers.

Indeed.

I'd wanted to try a "mains power supply" for the experience of trying to get a PS quiet enough. It's not impossible, I've been reading a bit on the Pearl 3 phono on DIYAudio, which has 4 paralleled SK170s with a local shunt reg, and a remote raw DC supply. Next I need to try distance ...

Okay, just for a laugh I got the scope out, but I couldn't find anything of use. The inputs were tied to ground via 100R, probe on the output. Just a mushy flat line. No wave form. I'm not surprised tbh.

I'm just using the one channel, so it's triggering on the output. Any benefit from triggering ...