Oh hi Flux !! I remember you from the RCT3 days, and now I see you here... such a small world !

As a simpleton, can you help me understand what’s behind this? Was 5v a common supply voltage? Is it 3.3v now? Why did people change to 3.3v?

@@BenGras today 3.3v logic is common for chips, back in the day 5v was more common. I'm no expert but I assume this has something to do with increasing the power efficiency of circuits.

@@woofcaptain8212 It does mostly have to do with efficiency as you guessed. As a general rule, FET type transistors have to switch voltages and there are two general categories of losses that affect the efficiency. The first is on state losses which relate to the Resistance of the transistor when it is completely on (voltage from gate to source is significantly above the threshold voltage). This quantity is given in transistor spec sheets as Rds(on), and for "good" transistors can be in the low mOhms range. The power loss here is usually very small for logic circuits, but in some cases can be significant in cases where the transistor must conduct large currents. The second type of losses are switching losses. When a FET transistor is switching from on to off, the resistance changes from Rds(on) to a very high impedance (tens, hundreds or even higher MegOhms). The voltage across the FET also switches from a very small voltage to the full rail voltage of the FET. When the FET is off it absorbs very little power, and when it is on it absorbs very little power, but when it is switching, for a brief instant (usually on the order of 100ns, but can be much fast or slower depending on the particular FET geometry and chemistry) the FEt is at a point where it has an intermediate voltage and an intermediate resistance. At this point, the power it absorbs is the voltage^2 times the resistance. Although this amount of instantaneous power is relatively high, it only happens for the short duration of the switch, so alone its not very much energy. When you switch millions or billions of times a second, it adds up quickly. In fact the higher the frequency, the higher the switching losses. To combat that, you can drop the voltage. Going from 5V to 3.3V reduces the switching losses by 60% assuming all else remains the same. In addition, when the voltage swing is lower it takes less time to switch, so the power savings is actually even more pronounced. This faster switching also allows the circuit to operate at a higher frequency as well. The only limit to this is the minimum voltage the FET actually needs in order to turn on, which can be improved by better chemistry. In fact modern processors have a core logic voltage that is less than 1V. Undervolting a processor is a good way to reduce its power consumption, but can lead to not enough voltage for switching to happen completely and result in logic failures. In the late 80s, 5V logic was the norm (it was called TTL logic). Today, 3.3V logic is available in two primary flavors, CMOS and LVTTL (Low Voltage TTL), and many off the shelf parts are available that commonly operate down to 2.5V.

Lol, P=V²/R, according to me 1V is more than enought !

Yo ! Me too ! Great "Real World" Tut.

This would be really great! Consider writing a book Dave! :)

There are a lot of books already, but no one book cold explain anything better than visualization shown step by step!

Daves video are best for guys who dive in to hardware field with hands-on... as a guy who likes to make his hand dirty never like to read text...

I’m good with that great idea

I want one.

+TheBrodarica let's just hope his fate is not the same - meaning his interests and work product don't become his accidental undoing. steve was very careful and rays/skates aren't normally hostile to humans, but sometimes weird stuff happens.

One hand in your pocket at all times. One hand in your pocket.

No, that would ElectroBOOM. Nobody else methodically fucks around like he does.

ye, he carries on a bit as well

Dave to electronics is like Bob Ross to paintings, slow methodical and simply brilliant. ;D

Practical, hand-on, visualized explanation. Just what the doctor Dave has ordered. ;D

Ugh. UGH! Disgusting, lol

daves time to shine

Especially the clear visualization on the graph, where you can see the multi caps expanding the operating band in the middle.

would be cool to mention that he is showing the abs value of the impedance which is actually complex-valued. And also that some of the calculcations are to be seen approximately

@Zyaire Judah 50

Right there with ya!

When it comes to high performance the layout becomes a main factor in the equation. When you are doing that kind of stuff the manufacturers typical design is most likely not enough. You may actually be using the device outside specifications.

Intermittent problems are the worst one can encounter. Frustrating to pinpoint, and sometimes hard to fix.

+Ciscodude He "is" a great teacher :)

If you were hungover he'd be bad

You will find that he is a Tafe teacher who teaches "Trade Courses" Dead certain of it.

You are geñius?Great, YouAre one interesting person!

A deeper video on how to measure the frequency response of your bypass caps in a real world application with no specialized gear (e.g. only a DSO) would be really cool!