A pulldown resistor for the MOSFET's gate (n-channel) is a very simple, reliable and cheap solution. There are things which can be done in hardware much better than in software
Well but this is an extreme example and not really representative of what people around here work on.. Also raising the voltage to 6V as ElectroIrradiator is not a good case since there are many simple ways to do it (add one battery?)
I'm looking for examples that would justify buying these scopes and power supplies, and you guys are perfect for that since you may be fully utilizing such equipment.. Could you guys give any examples?
I'd like to list 10 reasons/projects where I'd need such lab equipment (rather than a PC power supply unit)
A pulldown resistor for the MOSFET's gate (n-channel) is a very simple, reliable and cheap solution. There are things which can be done in hardware much better than in software
Of course, but since you have to pull the gate up at a certain moment, and you don't know the state of your controlling circuit before your processor runs.... If it was that simple we would not have any PSU's with this kind of behaviour don't you think?
A battery in series with the PSU? I won't comment anything on that :-)
If you can't think about any reasons yourself you simply don't need any fancy PSU.
BTW another example of good equipment made right is the Fluke 87V. I love my Fluke 87V, I can trust it and I must admit I find it amusing when Dave puts the 87V to the back and puts his Agilent front and Center whenever a critical test comes up and then we get to see the least two significant digits on the Agilent moving around like a slot machine. Anyway I love Dave's videos I just wish that when he did equipment reviews they were done with a little less ratings emphasis on the rarely used features and concentrated more on the accuracy and usability of the basic features that most of us use 99% of the time.
If you can't think about any reasons yourself you simply don't need any fancy PSU.
Ok, but show me your use cases and the projects you developed where you actually needed it. if you have a blog just post it.
- audio: Are you creating your own audio amp? But then the very first thing you need to do is to build a power supply, right? If you are just repairing it then just use the power supply that comes with the amplifier.
- MCU well, for this is ideal a PC PSU
- repairs, as in audio, if the power supply is broken then that is what you need to fix, if not no need for a power supply
- powering tools, what sort of tools are those that come without a power supply?
A very good use case I have found though is from http://thesignalpath.com/blogs/ hes a very cool guy that has a video blog that shows you lots of cool projects and experiments, and many times he needs to show how a certain value changes with voltage or intensity... you should check it out. But any other projects besides his.. I dont think they really need a very fancy PSU... my PC's one has 3.3v(never used), 5V(logic), 12V (that i use for motors/steppers) ans -12v(which I never use because I tend to use low voltage op amps or virtual ground...)
Hi! Anyone noticed the false voltage readout around 29:30 in the video? CH3 shows 0.404V while it was clearly set to 5V 1A... What's going on there?
I got way too many things on my plate to sit around and debate what I said because it's just a fact. In the old days aka the 1980s and before, people used their Brains and minimal equipment because real lab equipment was for corporations or the super rich engineers (an Oxymoron). Today most of you guys just sit around just playing with the equipment and checking out features and Bling and have no idea how to Fix anything or design anything unless as some one said before you can feed it into a ADC and work with it in software. Unfortunately Daves Video reviews just keep stroking this passion and really don't help any of you to get more into electronics itself but instead turn you guys into equipment aficionados.
As has been stated.....where is this 'precision' power supplies 'Sense' input Without such it is missing the point of precision voltage and current completely !
Some people like test equipment, what's the problem with that?
If you don't care about test equipment, you don't have to watch the test equipment videos, nor read the threads that are specifically about test equipment.
If you have nothing useful to contribute to this test equipment thread, then why are you here complaining? Why waste your time?
I think what he means is that people focus too much
In reality what we mean is: Dave, please push the limits of the hobbyist edge, show us your tricks, projects we never thought of, make us jealous, show us what are we missing out for not having such scopes! As a side effect you'll be plenty of content for your videos
As has been stated.....where is this 'precision' power supplies 'Sense' input Without such it is missing the point of precision voltage and current completely !
Whilst I agree that's an important feature for a precision PSU, I don't think it's essential (on a low end one like this) nor does it make your precision supply useless without it.
Precision current for example is still going to be valid in the majority of usage scenarios. And the precision voltage is still very handy for when you have a very low impedance path between your PSU and DUT.
0.05% at 12V for example is 6mV, which would allow for say 6 miliohms at 1A to still give you a handy precision 0.1% tolerance.
As has been stated.....where is this 'precision' power supplies 'Sense' input
As has been stated.....where is this 'precision' power supplies 'Sense' input
Whilst I agree that's an important feature for a precision PSU, I don't think it's essential (on a low end one like this)
It is now classified as "High-End" power supply by Dave.
What is sad is that Rigol is using the marketing ploy of excellent banner accuracy percentages 0.05% for V and 0.2% for A with large added offset 10mV and 10 mA. looks great at first glance and sadly most do not do the math to see what the real percent of value errors are. 10V is 0.1% max error 3.3V is 0.2%max error, 1.0V is 0.55% max error. Still good performance but far from that banner 0.05%
I think what he means is that people focus too much on having super cool test equipment rather than on fully utilizing it...