New answers tagged

5

The total thermal resistance is the length * resistivity / Ac, where length is the length of the conductive path, Ac is the cross-sectional area of the conductive path, and resistivity is the thermal resistivity of the pad. The conductive path length is actually just the thickness of the pad. So even though the resistivity may be high, because the thickness ...


5

If thermal tape is 100 times less conductive than aluminium, how do they manage to do their job and transfer the heat even at high power applications? They do their jobs because they are better than air, which is lower than 0.024 W/(m*K) and so they are approximately 100 times better than air. If your using an adhesive or thermal compound, it needs to ...


6

Heat sinking compounds/tapes are less conductive than metals but are orders of magnitude better than air. The main goal of these interfaces is to fill in the gaps between the solid interface between your heat source and sink. Without such compounds air pockets would form and the thermal interface would be poor. See the image below (source). The compound ...


2

How do they manage to do their job... I am more familiar with pads than adhesive tape, but they are similar. Although they are not as thermally conductive as metal, they are more thermally conductive than air. They assure good physical contact, and they are very thin. A typical thermal pad has a thermal resistance of 1 W/mK and a thickness of 0.2 mm. One ...


0

I know that this question is an older question but I still feel that it is current and relevant and I would like to reflect on this part of the OP's question: how does one choose which to use? From my understanding is that the basic SR latch without a clock input is simply a latch. If you need to temporarily latch an output from some operation that isn'...


0

The MDI Pairs will be going directly to the ethernet PHY on the camera. Does it not send ground A to ground B directly? Ground A and ground B be the same because of the MDI pairs going to the PHY on the camera? If this is the case, would it not defeat the purpose of the isolation transformer? The Ethernet magnetics can provide isolation, depending ...


0

This was driving me slightly nuts for a min, and I had some projects that would be "modified" as soon as Altium opened it and others which would behave fine. I dug through the project parameters looking to see what was different. I found something that fixed this problem for me, hopefully it helps you too. If you go into your Project Options, go to the '...


1

I'm surprised that no one gave this answer - Use the Altium Vault. Vaults now go under a different name, but since Altium bought OctoPart, you can now use Altium to search components and add them - even if you have to create your own footprint, it still gives you sourcing information. As a sole hardware engineer, this was my saving grace because the part ...


5

Do a sensitivity analysis of each component in your circuit. Pt100 DIN changes about 0.385% per °C, so a 3°C error represents ~1% overall error. This will also inform your selection of components for stability with temperature, moisture, time and soldering. In this particular case, resistor tempco should certainly be considered for the critical parts. 1% ...


1

Probably these dimensions are used to calculate the inductance by an approximation formular. Wheeler's formular is likely used as it's often referenced when searching for such a respective approximation formular. Then \$b\$ is: And for \$h\$ you can think of printing that picture several times and placing the sheets one onto the other. Here are also ...


1

This isn't really an answer, but cells (dependent on both type and particular construction) obviously have a maximum C-rating for charge and discharge which you should always stay below. But if you know that your application isn't going to need to draw anywhere near the maximum current that the battery can safely provide, then you could limit things to be ...


2

So you need to measure the speed of a fast moving object. This requires that you measure its position and the time at that position twice and precisely. Or if you know the weight of the projectile you measure its energy and hence derive speed. Neither of these things can be done with a plastic projectile through an inductive sensor. Go back to the classic ...


0

If you are only trying to implement your circuit then to me it seems that you are over thinking this: first let’s give NAME to the different signals: simulate this circuit – Schematic created using CircuitLab Now, let’s right the equations that rules the circuit: s_3 = s_1 XOR s_2 s_4 = NOT s_2 s_out = s_1 AND s_2 Now, let's write the ...


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In the logic symbols, the bubble represents the inversion. Whatever is the signal, the bubble inverts that signal. For example, in the picture AND gate is used. The output should be logic 0 but due to bubble at output, the output of gate changed to logic 1.


4

The dot represents inversion. It's an OR gate with one input inverted. An equivalent circuit is: simulate this circuit – Schematic created using CircuitLab (Imagine the triangle part of the inverter disappearing, and you'll see the resemblance.)


2

another useful circuit is this; (added 2nd circuit, that self-biases for ANY NPN) The Rsource and the Rload are typical values encountered when you CASCADE 2 or 3 or 4 or 5 of these circuits to achieve gains of 100X or 1,000x or 10,000X or 100,000X. The 100 ohm in VDD, along with 100uF, is needed to reduce the likelihood of VDD-coupled oscillation. In fact, ...


5

This is how "constant-base current" circuit will look like: simulate this circuit – Schematic created using CircuitLab The base current will be fairly constant as long as \$V_{CC} >> V_{BE}\$. $$I_B = \frac{V_{CC} - V_{BE}}{R_{B1}} \approx \frac{V_{CC}}{R_{B1}}$$ And due to the fact that \$I_C = \beta \cdot I_B\$ and \$V_{CE} = V_{CC} - ...


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