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Definently agree. This original post hits a whole punch of EE topics. Sure, if the OP was an expert in consumer microwaves and WiFi theory and RF and FCC Compliance - they could write an epic pos...
This is usually done by driving the motor very slowly open loop at startup. The idea is that the rotor will follow the magnetic field. Once you think the rotor is in sync with the drive, you spee...
Linear systems lend themselves to analysis since they follow certain rules. Because of this, much analysis has been done and theory developed, so there is now lots to keep undergrads busy with. M...
You haven't explicitly stated what is the voltage supply at the anode of the LED, but according to your schematic, it is apparently 3.3V. So, I'll assume this value in what follows. There is a fla...
Background: I have several microcontroller based projects with custom PCB that have been in very-low-volume production, but the quantities are starting to go up. (batch sizes now ~100 and threateni...
A few months ago, I too was looking for answers on how to connect the USB shield with ESD in mind. I always connect the shield through a resistor to ground and a capacitor to ground (100kΩ and 0.0...
Sensorless BLDC motor controller are becoming more and more popular, especially with rising of the drone industry. Being able to detect where the rotor is at 0rpm or no load seems intuitive if we ...
In the case of a permanent magnet motor, as found in many smaller drone motors, I have seen controllers merely activate the drive at some phase angle that has maximum theoretical torque (two high, ...
The text values in the specifications section are always the real specs. Unless otherwise stated (and that's quite rare), graphs are suggested values, typical ranges, variations due to a single va...
a coil with plain on/off functionality, for example a 24VDC relay coil with 700mW max coil power. That means a coil current of 0.7 watts / 24 volts = ~30 mA. A relay might have a coil inducta...
I read datasheet for PCT2075 temperature sensor and there are some contradicting data about accuracy for me. Page 21: accuracy ±1°C (Tamb = -25°C to +100°C) accuracy ±2°C (Tamb = -55°C to +125°C...
It is hard to know from a single static low-res picture, but my guess is that something caused a short across the high voltage lines. That could be a falling tree limb, a squirrel making an unfort...
I've created the category and enabled the Article post type (only). It uses the same tag set as Q&A. If you want me to change either of those, let me know. Please let me know what you'd like ...
I'm using a variable duty cycle square-wave oscillator to drive a half-bridge MOSFET pair like this. Upper MOSFET is P-channel type, lower MOSFET is N-channel type: - And, I think I'm getting shoo...
To avoid shoot-through you should ensure that the active-low P-channel MOSFET gate drive voltage never overlaps with the active-high N-channel MOSFET gate drive voltage. With an inverter driving th...
Why do the Darlington or Sziklai configurations need complementary transistors? They don't. In fact, it's usually not even desirable. However, before we get too far, let's make it clear what we ar...
When switching a relay there should be a flyback diode. It could be just a diode or diode with resistor in series. I understand there is a difference in the speed of relay switch-off. But what is t...
I understand that some applications require NPN-PNP pairs with identical electrical characteristics. But I would like to understand why.
Here is the circuit in question, with the component designators changed to make them easier to write: To understand this circuit, try building it up in pieces. First, let's only include R1 and R2....
I've built a non-inverting op-amp amplifier with a gain of 101 using this circuit: - My input is 10 mV DC and I expected to measure 1.01 volts at the output but I measure 0.81 volts. What has happ...
It's not completely clear, but it seems you are asking about a circuit in a class 1 div 2 location that will drive another circuit in a class 1 div 1 location. The point of the IS barrier is to pre...
How do I calculate the inductance and capacitance out from the barrier to make sure it is less than the sensor values? The output capacitance and inductance from your zener barrier is irrelevant ...
I am designing a PCB that has to have class 1 div 1 associated apparatus (only the outputs to the sensor) certification. Essentially, I am using a boost converter to convert the voltage from a lith...
A couple of problems stick out; one glaring and one a little subtler. Read this in the data sheet: - You have the enable pin connected to your 25 volt output. I'm not saying this is definitely cau...
I have just raised a Q and A but when editing the answer (that involves a picture) there is no "live" version of the potentially finished post and this will prove to be a problem when making a comp...
