For when you need to measure your tzzzzzt: https://www.ebay.co.uk/itm/255592412251
I have a P6013 that I ought to sell (since I've also got a P6015).
The bad thing with the P6015 is that it has to be filled with FREON and that is almost unobtanium
The P6015A is gel filled and last forever, if treated well.
Those DC converters need a load to stop them oscillating frantically. I did some tests on some ages ago. Surprisingly I couldn't murder them!
<snip>
AirPods pro with transparency mode on. Also works for the idiots when you get out of the car as you can turn on noise cancellation modeNot so sure that they are allowed to be used while driving, certainly not worth the hassle of trying to explain to traffic cops that you can still hear emergency two tone horns and other shit.
Fair points. I don't drive with them in as I quite like offensively loud music so I can't hear the two tone horns either
<snip>
AirPods pro with transparency mode on. Also works for the idiots when you get out of the car as you can turn on noise cancellation modeNot so sure that they are allowed to be used while driving, certainly not worth the hassle of trying to explain to traffic cops that you can still hear emergency two tone horns and other shit.
Fair points. I don't drive with them in as I quite like offensively loud music so I can't hear the two tone horns eitherI can join you on that point, I love to play my stereo loud and soak in all that lovely sound quality
*puts hand up to ear* "WHAAAAAAAT?!?"
mnem
thump.
UK weather report said that there is high chance of thunderstorms for the southeast and the first lightening strike has just been recorded at Stratford St Andrew in Suffolk and another near Ashford in Kent, but the main storm is currently still over in Belgium, so will we get a storm or not?
https://www.lightningmaps.org/?lang=en#m=oss;t=3;s=0;o=0;b=0.00;ts=0;z=6;y=49.9066;x=3.5287;d=2;dl=2;dc=0;
UK weather report said that there is high chance of thunderstorms for the southeast and the first lightening strike has just been recorded at Stratford St Andrew in Suffolk and another near Ashford in Kent, but the main storm is currently still over in Belgium, so will we get a storm or not?
https://www.lightningmaps.org/?lang=en#m=oss;t=3;s=0;o=0;b=0.00;ts=0;z=6;y=49.9066;x=3.5287;d=2;dl=2;dc=0;
<snip>
AirPods pro with transparency mode on. Also works for the idiots when you get out of the car as you can turn on noise cancellation modeNot so sure that they are allowed to be used while driving, certainly not worth the hassle of trying to explain to traffic cops that you can still hear emergency two tone horns and other shit.
Fair points. I don't drive with them in as I quite like offensively loud music so I can't hear the two tone horns eitherI can join you on that point, I love to play my stereo loud and soak in all that lovely sound quality
I rarely listen to music while driving. I find it too distracting. I much prefer to be fully alert for hazards as well as concentrate on the main objective: driving.
*puts hand up to ear* "WHAAAAAAAT?!?"
mnem
thump.
Just today I'm coming up my road and there is a kid on a bicycle going in my direction in the middle of the road. I slowed and figured he would hear my approach. Nope. I had to come almost to a complete stop and decided I had no choice but to lay on the horn. Only then did he turn around and realize I was there and moved over. And then I saw that the jerk had earbuds on.
3/ The two large wires connected together are the CPC (earth) and Netural. A connection which according to some does not exist.
I am not sure of the Canadian and USA differences, but my understanding for the GWN is that those are to be connected together in only one specific location, done by the electricity utility company.
Anything done within the house at or after the main panel shall not have the Earth and Neutral connected together.
Two reasons I can think of:
- no ground loop current
- correct functioning of GFCI protection
As for unused conductors; we are too cheap in the GWN to allow that situation to ever occur... my vague recollection of the rule is that it is such a major PITA to be avoided at all cost.
I think my choice of music reflects my driving
<snip>
AirPods pro with transparency mode on. Also works for the idiots when you get out of the car as you can turn on noise cancellation modeNot so sure that they are allowed to be used while driving, certainly not worth the hassle of trying to explain to traffic cops that you can still hear emergency two tone horns and other shit.
Fair points. I don't drive with them in as I quite like offensively loud music so I can't hear the two tone horns eitherI can join you on that point, I love to play my stereo loud and soak in all that lovely sound quality
I rarely listen to music while driving. I find it too distracting. I much prefer to be fully alert for hazards as well as concentrate on the main objective: driving.
I think my choice of music reflects my driving
*puts hand up to ear* "WHAAAAAAAT?!?"
mnem
thump.
Just today I'm coming up my road and there is a kid on a bicycle going in my direction in the middle of the road. I slowed and figured he would hear my approach. Nope. I had to come almost to a complete stop and decided I had no choice but to lay on the horn. Only then did he turn around and realize I was there and moved over. And then I saw that thejerkstrong Darwin Award candidate had earbuds on.
*puts hand up to ear* "WHAAAAAAAT?!?"
mnem
thump.
Just today I'm coming up my road and there is a kid on a bicycle going in my direction in the middle of the road. I slowed and figured he would hear my approach. Nope. I had to come almost to a complete stop and decided I had no choice but to lay on the horn. Only then did he turn around and realize I was there and moved over. And then I saw that thejerkstrong Darwin Award candidate had earbuds on.
Fixed that for you.
-Pat
Just today I'm coming up my road and there is a kid on a bicycle going in my direction in the middle of the road. I slowed and figured he would hear my approach. Nope. I had to come almost to a complete stop and decided I had no choice but to lay on the horn. Only then did he turn around and realize I was there and moved over. And then I saw that the jerk had earbuds on.
UK weather report said that there is high chance of thunderstorms for the southeast and the first lightening strike has just been recorded at Stratford St Andrew in Suffolk and another near Ashford in Kent, but the main storm is currently still over in Belgium, so will we get a storm or not?
https://www.lightningmaps.org/?lang=en#m=oss;t=3;s=0;o=0;b=0.00;ts=0;z=6;y=49.9066;x=3.5287;d=2;dl=2;dc=0;
I fucking hope not. It better not shit it down for Newbury on Sunday.
*puts hand up to ear* "WHAAAAAAAT?!?"
mnem
thump.
Just today I'm coming up my road and there is a kid on a bicycle going in my direction in the middle of the road. I slowed and figured he would hear my approach. Nope. I had to come almost to a complete stop and decided I had no choice but to lay on the horn. Only then did he turn around and realize I was there and moved over. And then I saw that thejerkstrong Darwin Award candidate had earbuds on.
Fixed that for you.
-Pat
He might not have buffed out and I hate damaged sheet metal.
UK weather report said that there is high chance of thunderstorms for the southeast and the first lightening strike has just been recorded at Stratford St Andrew in Suffolk and another near Ashford in Kent, but the main storm is currently still over in Belgium, so will we get a storm or not?
https://www.lightningmaps.org/?lang=en#m=oss;t=3;s=0;o=0;b=0.00;ts=0;z=6;y=49.9066;x=3.5287;d=2;dl=2;dc=0;
Are thunderstorms that rare in the UK? Damn near once or sometimes twice a week here in the Summer.
If there's one thing I've learned over the years it's that cyclists, pedestrians and drivers are all cunts
OK past midnight, I gave the board one last try before calling it a day and moving on...
... I increased the load even more, to see if the chip would switch to full frequency and what would become of the ripple. Found a beefy 15W 15R resistor. That increased the load to 600mA or so.
Ripple plummeted !
So much so that the fixed x10 Agilent probe that came with the scope, was attenuating a tad too much to zoom on the ripple.
So I replaced it with my usual Tek x1 / x10 probes. Of course doing that limits the B/W to 6 MHz or something, but still good enough to see all the crap coming out of the regulator... no shortage of that for sure.
Ripple as you can see is now only 1mVpp... if you conveniently omit the bursts that contain huge spikes. If you count the spikes then it's more like 5mVpp, which is still very good for a switching anything, especially a cheap one eh ?
So I tried to measure frequency... saying "try" because the waveform looks so noisy, there is no saw tooth to look at any more, it's just noise.... but well, you gotta measure something so....
If I measure between two big bursts, the packets that feature the huge spikes, then I get 100kHz. If I then zoom in to look at the smaller oscillations in between two bursts, then I get 900kHz.. spot on the theoretical switching frequency that we calculated, so that's quite nice. So assuming that's not just luck / coincidence, then that means that all these spiky bursts are at LOWER frequency that the switching frequency ?! How can that be possible ?! I mean of course I am OK having high frequency parasitic oscillations, but LOWER than the commanded frequency... no I don't quite get it.
So that means instead maybe that the chip at 600mA still is running at 100kHz not 900kHz, and that the 900kHz oscillations we see are just a coincidence... it's nothing to do with the 900kHz we set with that resistor.
Lots of fun.
OK taking everything apart and clearing the bench, more component sorting on the agenda tomorrow...
EDIT : tried to add averaging to clean the signal a bit but jo joy : the deep memory of the Megazoom makes it a no go : adding even a tiny amount of averaging, lie 4 8 or 16, slows down the redrawing tremendously !
With my modest Combiscope and ancient TDS, short memory so I can add LOTS of averaging to clean stuff up really well, with little to no impact on the trace responsiveness. That's great.
So for me at least that's one big problem with the Megazoom, so I am not getting rid of my Combiscope and TDS anytime soon.
Would be nice if the Megazoom allowed you (does it ? Didn't find it in the manual), to disable the deep memory in this particular case.
Also another scenario where the deep memory hurts is refresh rate when trying to find a runt pulse or something. You don't need silly high time resolution to find it, but rather high refresh rates.
I understand the modern scopes allow you to set yourself the trade-off between sampling speed and memory depth which is the best of both worls I guess. The merger between the older scopes, and the Megazoom revolution.
So yeah, I love the Megazoom but I will keep my other scopes as well, I want BOTH !