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H: Can high audio input level cause video loss or video distortion in camcorder?
Today I met with a vendor regarding the installation of a PA system at our facility. We currently record meetings with a handheld camcorder mounted on a tripod, and we're looking to add microphones in order to feed a clearer signal into t... |
H: DC Motor Winding Insulation Material
As I understand it, the field coils and armature windings in a DC motor are insulated and this insulation can 'burn off' if the motor overheats, causing a short circuit to develop. What is the material coating the windings and coils in a DC motor? In the examples of the insides ... |
H: Calculating grounded emitter amplifer distortion (Art of Electronics 3rd Ed.)
Referring to section 2.3.4 A1 (pages 94-95) of the Art of Electronics 3rd Ed., I'm having difficulty understanding how to calculate distortion of a grounded emitter amplifier. The book says:
Because the gain is proportional to the drop a... |
H: What are the minimum and maximum number of cycles consumed when executing an interrupt on an STM32F0 MCU?
Assuming I set an external GPIO interrupt to highest priority, how many cycles does an STM32F0 MCU take to:
start executing the interrupt handler code
return from the interrupt
I expect that the answers will ... |
H: Determining equivalent resistance to find the cutoff frequency
I am designing a low noise circuit for a precision application and require a stable voltage supplied to the circuit. I have determined that the MAX6250 voltage reference best suits my circuit. A snippet of my schematic can be seen below:
I have added t... |
H: Soldering tab terminals without using holes
I cannot find any information about a practical problem I encounter.
If we don't have crimping tools, when soldering wires to tab terminals with holes as below:
Do we need to pass the wire through the hole before soldering?
But sometimes the wire is much thicker than the... |
H: Protecting two layers of PCB with electric tape?
I have soldered several small PCBs, and I want to stack them together (using hex spacers).
However, since lack of (vertical) space it could be that some components (on the top) might touch the wires/solder junctions (on the bottom) of the PCB above.
What is a good wa... |
H: What are these CAN frames / messages?
I'm writing software for a project that sends data to me using a CAN bus. The software runs fine in small test scenarios with 3-4 bus members, however with increasing members the bus sends data with very high addresses and new (non hexadecimal) data I haven't seen before:
Fir... |
H: Short-circuiting the primary coil of a transformer to keep it warm
I saw this problem somewhere and I wanted to give it a try, but the numbers I've got seem to be pretty outlying.
We have a 25kV / 4160V transformer which is out of circuit for now. To protect it from humidity in a freezing cold conditions, we need ... |
H: electrical homework help
I need to solve exercise 57. I need to determine the voltage between points A and B in diagrams (a) and (b).
What I think so far:
The voltage on 10 ohm resistor is = 0.1A * 10Ω = 1V
The current on 20 ohm resistor will probably be 0.1A too (I think, I'm not sure). In this case its voltag... |
H: Kirchoff law exercise
I need to determine the current across the 4 ohm resistor (name it I1).
What I calculated, thought out so far :
Current of 2 ohm resistor : I=5V/2ohm=2,5A. I Think this current is flow towards the A point (because the current and voltage direction is always the same on passive components, is... |
H: STM32f103 DMA with PWM repeating values
I have a Blue Pill (STM32F103) and connected to it a ws2812b led strip. I am trying to send data to the led strip via PWM over the TIM2 peripheral (Pin A0). To change the duty cycle of the TIM2 PWM I use a DMA channel. This works perfectly at lower speeds (eg 100khz) but as s... |
H: AVR: Pullup vs Pulldown on button input?
So I know the Atmega328p (What im using now) has Pull-up resistors available to be activated. And I know when reading input we could either make a button cause a PIN to go high or low....but is there an advantage to either?
Obviously making the button go to GND when pressed ... |
H: How far can a terminating resistor be from the literal end of a CAN bus?
I'm wondering if anyone knows if there is an upper limit for the distance a terminating resistor can be from the literal end of the CAN bus or where the last node is.
We have an HMI that is connected to the CAN bus and it is located beside a p... |
H: A question about triac output of zero crossing SSR relay
In a zero crossing SSR if the output is a triac, would the gate be fired/triggered every 180° or would the gate be applied a constant voltage all the time?
I'm asking because in both cases the load will pass the whole aleternating current.
EDIT:
First of all,... |
H: Convert 36 V lawn mower from Lead Acid to Li Ion batteries - charging / danger
I have a 36 V lawn mower with a battery container with three 12 V SLA batteries in series.
I am thinking about switching to LiIon batteries for more run time (and hopefully more recharge cycles). I can find batteries that fit physically,... |
H: Ultrasonic Sensor Serial Output Grounding Issue
I have a small circuit which uses a Maxbotix Ultrasonic sensor (Datasheet: https://www.maxbotix.com/documents/HRLV-MaxSonar-EZ_Datasheet.pdf) to take distance measurements and then transmit them over bluetooth with a BLE Nano 2 IC. The circuit is powered by 3 AA batte... |
H: What is the purpose of these capacitors in this State Variable Filter schematic?
I need some help understanding this schematic. It's a state variable filter based parametric equalizer. What are the capacitors C4, C5 and C6 for? Are those coupling capacitors like C1 and C7? Are they necessary? Because, if I simulate... |
H: Little torque of single phase asynchronous motor
I have a single phase asynchronous motor rated 230V, 500W. It has three terminals labeled U, V, W. I connected L1 to U and N to V (other way round makes no difference though). Between V and W is a 500V 18µF capacitor.
Without load the motor starts spinning and reache... |
H: What is the best approach to calculate the transfer function of this RC circuit?
I want to calculate the transfer function of the circuit below. I tried to calculate the equivalent impedance of each block and work my way with voltage dividers until I get to V3, but this method is very long and I wonder if there is ... |
H: Do SMD resistors have to be reflowed black side up, or is black side down okay?
I reflow my own boards in a toaster oven. When I drop my resistors off the paper tape, I always flip them over to black side up before I place them. Should I bother if it doesn't really matter?
AI: There are several reasons to put the a... |
H: When I rework an SMD capacitor or resistor, it will sometimes stick to the soldering tip. Does this high temp then destroy it?
When I rework 0402 capacitors, then often stick to the tip of the soldering iron. My iron is set at 350. I then discard the cap because I am worried the sustained temp for a few seconds has... |
H: What kind of part is this?
What kind of part on the board below? Or it's a part of another part?
AI: It's an AMC (Advanced Mezzanine Card) hot swap ejector handle.
Similar to one of these.
There are three positions the latch can be in, a switch to tell the card that withdrawal is anticipated, and typically an ind... |
H: Measuring MOSFET input capacitance?
Am I calculating total input capacitance or gate capacitance or none of the above? And are my calculations even correct to begin with. The point of this is that I want to know what gate capacitance im dealing with to properly chose a gate resistor to give me the rise time I need,... |
H: Q: Amplifier's Output filter not having the Correct Cut off frequency
I am trying to design a output filter, a simply one (First order) just to play around with and for some reason when I run the simulation of it its not the correct Cut off frequency which it was designed for.
There's already a High Pass Filter at ... |
H: Typical application for FAN5333B
I have an issue regarding the typical application for FAN5333B LED driver.
According to the spec, SW output can achieve 30V to GND.
Can this influence the input voltage which is typically about 5V ? Both point are directly connected for DC.
AI: The FAN5333B is a boost converter.
... |
H: Audio Frequency Response Offset in dB
Say I have some audio device with the following absolute frequency response:
I want to shift the curve up, so that the 1kHz point is the 0dB point, and everything else is relative to this point. Am I correct, that I cannot simply add 0.35dB to the entire curve, but need to com... |
H: A simple circuit to turn on door LED when someone visit me
I want a simple circuit do an alarm light that tell me someone visited me.
When someone visits me and in the case no one answer the door, I want to know that.
So I want a press button switch outside the door that will turn on a LED inside the house and wil... |
H: How to drive 4-pin fan
I've been attempting to get this 4-pin brushless dc pc fan working for some time now.
It has a red (+) black (-) blue (PWM in) and yellow (tachometer out).
I only want this fan running at maximum speed and I have seen people run these, like in this video without the PWM blue wire. However, th... |
H: Why are FPGAs so expensive?
I mean compared to ICs (ASICs) with similar complexity, speed etc. Let's compare Ethernet switches to Kintex FPGAs (note that the most expensive switch from the list is circa as expensive as the cheapest Kintex):
FPGAs are well structured ICs (like RAMs). They can be scaled and develope... |
H: Equivalent circuits with one or multiple resistors
I am designing a circuit but I am facing a repetitive design that require too many resistors. The problem comes down to answering if the next two circuits are equivalent in terms of voltage drops:
simulate this circuit – Schematic created using CircuitLab
simulat... |
H: Using a residual current device when there is an isolation transformer
In a system, currently there is no circuit breaker and RCD, but there is an isolation transformer as in the diagram below:
simulate this circuit – Schematic created using CircuitLab
As you see the transformer has no earth wire connection.
What ... |
H: Motor Braking Issue
I have the following schematic using the motor below. (I did not create the schematic) The only information I have on the motor is what is on the information plate. The current schematic works, somewhat. When the motor flag hits the sensor, it takes too long for it to stop as shown in the thi... |
H: Can Induced electromotive force affect itself?
At first, I want to say that I'm not English speaker, so my question might be very hard to understand. And also this question must be a silly question because I can't find any question like this...
I heard when current varies, inductor make induced electromotive force.... |
H: Reducing the order of transfer function while maintaining same response
Scenario:
I have been going through Ogata Modern Control Engineering book and working through several exercises to improve my understanding of basic control principles. I came across the following example which I am struggling to solve.
I am st... |
H: what voltage will 7805 deliver as output if input is lower than 5 volts, lets say 3 volts
I am looking at the 7805 specs sheet and there is one chart I find missing. It is the relationship between output voltage with input voltage, specifically when input voltage is lower that 5 volts, the "nominal" output voltage.... |
H: What does a transistor do?
Let's say I have a regular motor circuit using an arduino. The motor is a standard motor with a motor controller and I connect it to my arduino and get the code working but I realize that the motor is going a little slow.
If I add a transistor to the circuit the right way, does that make ... |
H: Does this experiment show that Kirchhoff's Law hold when there's a changing magnetic field involved in a circuit?
In this video, the electrical engineer and youtuber Mehdi Sadaghdar (ElectroBOOM) disagrees with another video from professor Walter Lewin.
Basically, professor Lewin shows in an experiment that if we h... |
H: C Language Pointers Question
Not sure if this is the correct place to post a programming based question so will have a go anyway.
Attached below is a piece of code and a table where I have to fill in the blanks. Just to clarify, the question essentially is, ("The table should contain both the address and value of e... |
H: Is a self-locking relay the same thing as a latching relay?
This self-locking/inching WiFi relay can be configured to work in self-lock mode, in either NO or NC mode.
I’m not sure if self-locking means the same thing as latching. Wikipedia says:
A latching relay maintains either contact position indefinitely witho... |
H: KiCad pad clearance problem
I set up a clearance of 0.256 mm, however, this distance is only applied between the ground and traces. When it comes to ground and pads, this distance is small. I am wondering will be the copper removed from that purple area, between the pads and the ground (see image), and what is the ... |
H: How do you connect a device pin AIo when there is only AI0+ and AI0-
I am new to electronics and I faced this problem. I tried to search about it but got lost.
Here is the sensor and the DAQ device
https://docs-emea.rs-online.com/webdocs/13ec/0900766b813ecfc2.pdf
https://sourceforge.isae.fr/attachments/download/182... |
H: How is this a High Pass filter?
Might be a dumb question, but isn't this a Low Pass filter? If not can someone explain me how it is a High Pass filter?
This is the link for the complete document: http://www.circuitbasics.com/design-hi-fi-audio-amplifier-lm3886/
AI: It's not, in that figure that is a voltage follow... |
H: Is there a practical way to create/inject some visible interference into a nearby AC mains?
I have this 230 to 6V rms step-down transformer. I use it to observe the mains voltage.
But recently I needed to create some interference or spike in the mains. So I first tried the following:
I used a filterless power strip... |
H: Do I need a relay for my LED bars?
I installed two 4" 18 watt LED light bars on my ATV. It is currently wired to the factory switch on the ATV handlebars and there is no relay being used. I have had to replace the right LED bar twice because it has died on me. Is this because I didn't use a relay? Will the relay he... |
H: why capacitor connect serially with resistor on the earth pin
I have this grounding mat, inside the electrical socket as shown in the picture, there are a capacitor and 100k ohm resistor connected serially to the earth point, the grounding mat is supposed to get negative electrons from the earth to our body, to n... |
H: Trouble with Eagle's BGA autorouter
Personally I'm having trouble with eagle's bgaAutoRouter when I use it, it's not doing the bga tracks and routes and I'm wasting a lot of time looking for how to make it work. my settings in image.
DRILL = 0.05MM
ALT = 0.125MM
layer = (1+2*15+16)
eagle version = 9.2.2
BGA ... |
H: How to solve a circuit network involving a resistor parallel to a voltage source using only nodal analysis?
I have been stuck on this for the past week and this week i just dont seem to find out what am i doing wrong. Please help me spot my mistake. Here you can find My circuit on multisim. Please provide me with ... |
H: How do I fix the speed of a generator?
If I need to generate power at a specified frequency, then I need to make sure that the rotor of the generator rotates at a specified speed (rpm). But when I am rotating it with steam or water how do I control this speed? It seems to me that the mechanical forces that rotate t... |
H: Sending few commands with BLE without microcontroller
I am completely new to electrical engineering, but I am trying to build a small device with three buttons circuit, each one of them would send a different command to the mobile phone via Bluetooth low energy module (I would like to use EYSHSNZWZ Bluetooth Low En... |
H: What's the purpose of this circuit section?
I'm experimenting on VCA circuits and found the same (or similar) pattern in many linear VCA projects found in internet using LM13700 OTA.
The specific section I'm curious is made by an Op-amp, a transistor, a diode and some passive parts, and is used to feed Control Volt... |
H: If you have two identical but oppositely wound inductors does the inductance effectively cancel?
I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking at the change in sig... |
H: Systems similar to TI's PRUs
I have been working with TI's PRUs on the am335x, equipped on the BeagleBone Black. I would like to know if other hardware manufactures offer similar systems. I am doing my Bachelor Thesis on this topic. So, it would be nice if I had some other system to compare to.
So far I have found ... |
H: How can i add voltage regulator to unregulated DC adaptor?
I would like to add L7809 voltage regulator to an unregulated DC adaptor,as
it is shown in the photo.
In the data sheet,there is a figure for application circuit that included 2 capacitors(bottom photo).
I understand that i need to add to the voltage outpu... |
H: How to control two separate circuits with one switch?
I have two separate circuits with different types of diodes. One circuit draws 3,5V and the other draws 9V. How can I wire this up so that one switch can turn both circuits on or off? As far as I understand I can do this with a relay. What kind of relay would I ... |
H: Amateur radio practice exam question
The question is as follows:
An interfering signal from a transmitter is found to have a frequency of 57 MHz (TV Channel 2 is 54 - 60 MHz). This signal could be the:
And the options are as follows:
A) crystal oscillator operating on its fundamental
B) second harmonic of a 10 me... |
H: How can I convert binary into multiple 7 segment displays
I've been trying to make a decimal calculator using binary adders that feed into 3 x 7 segment displays. I cant find an efficient way to do this. If someone could point me to the correct resources, or maybe show a circuit that you made that is similar, that ... |
H: Protecting opamp inputs when powered down
I'm designing a circuit with an opamp buffer at the input, which runs of batteries.
As the input does what it likes, the input of the opamp can see voltage even when the opamp is powered down. As the opamp inputs are rated at +0.5V V+ (rail) and -0.5V V-(rail), it is common... |
H: Voltage drift in lock in amplifier
I am testing out the lock in amplifier with just a single resistor, but there seems to be a downward drift in the in phase voltage. What could possibly cause this to happen? Could it be some grounding issue?
Thank you for your time.
AI: It could be real- you could be heating the r... |
H: Is there a preferred order VHDL case/when and rising/falling_edge statements in processes?
What pitfalls are there in putting my rising_edge check within a case/when block?
I have VHDL that uses code similar to the first example below and simulates correctly and is synthesizable. However, it is not behaving in acco... |
H: MSP430 USB Module and Baud Rate Detection
I am working on a project which uses the USB module integrated into the MSP430F5529, specifically using the MSP-EXP430F5529LP development board from TI. I am using the USB API provided in MSPWare.
The host talks to my device over MODBUS, and I am saving the current baud rat... |
H: Read temperature sensor from microcontroller to Android application (via microUSB)
I'm working on a concept for a project, and I'm having difficulty determining whether this application is possible.
I will have some misc. microcontroller with an attached temperature sensor, and that microcontroller will be connect... |
H: STM32L0/FTDI UART Transmit doesn't work
I have STM32L053 (link to overview) and I have been using STM32CubeL0 as UART examples. Also I connected FT232RL FTDI module.
Everything was fine. SIM800L and FTDI modules were working fine. Next day with same configuration modules didn't respond. I connected STM32 TX (PA9) ... |
H: Circuit element: Rectangle with diagonal
I am a newbie in electronics, so please bear with me.
I have a Induction proximity sensor which I have to integrate with a data logger. But, I have run into an issue with a circuit element. I am unable to understand the circuit element which is represented as a rectangle wit... |
H: Reducing the amount of controller output required - making k of n binary to unary decoder out of 1-of-n decoders
I am a kind of self-taught electronics dabbler and being a selftaught tinkerer has the unfortunate consequence of reinventing the metaphorical wheel quite often. I'd like to avoid this fate again if it's... |
H: Connect RS422 interface with Arduino Uno
I have a fishfinder,Lowrance Carbon HSD 7, and I want to connect it with the Arduino Uno to let the fishfinder transmit the Sonar data and GPS data via NMEA0183. According to the maker's site, the power/data cable uses RS422 communication having 4 cables which are RX+ RX- TX... |
H: BJT analysis resistance at the base using voltage divider
im currently confused as to why the resistance at the base is R1 || R2, ive done some research and looked at a couple of responses from people. But i still dont quite understand, could someone help me clear up my confusion please?
Some one has said:
If we as... |
H: PCB enclosure tolerances
I can imagine problems of PCBs not fitting into their enclosures or misaligned screw/hole pairs. Are these type of problems common, especially with the dirt cheap enclosures?
I am planning to use one that has a "0.8 mm tolerance". It does not specify where exactly this tolerance comes in t... |
H: H-Bridge Adjustable Slew Rate: Why is a decoupling capacitor needed?
I am designing a simple 3-phase inverter for BLDC Motor control. For that purpose, i plan to use a IFX007T from Infineon. The slew rate is controlled via a resistance connected in series to SR pin.
I do not understand how this resistance is used ... |
H: STM32F4 USART Receiver Pin Configuring
I am trying to configure STM32F4 USART peripheral. I thought that USART Receiver pin(RX) must be programmed as Alternate function to USART works correctly and then the data is present on the I/O pin can moves into the USART Receiver Shift register.
I mean that according to the... |
H: Relationship between I2C drawn energy / power consumption and data rate
Referring to just what the I2C lines draw, am I wrong thinking that the higher the clock frequency the shorter the time there will be (the same amount of) current flowing through the pullups and thus lower power consumed?
side qeustion
I don't... |
H: Powering 30m of RGB LED strips?
I'm currently interested in following this tutorial which explains how to create a homebridge (ESP8266) controlled 12v RGB strip which is exactly what I've been looking for. However, whilst I do believe this project will work perfectly for an RGB strip up to about 5m, I am aware that... |
H: What Reference-Potential does an Operational Amplifier use as "Ground"-Potential?
Wikipedia states on operational amplifiers, that, simply speaking, they provide an output voltage at their output which is the difference of the two input voltages, multiplied by some (very very large) number.
Since voltages are just ... |
H: Converting 0-5 volts (linear) to +2.5 -- 0 -- +2.5 volts ("vee")
I'm trying to find a simple way to convert a 0-5 V output from a joystick hall effect sensor to +2.5 -- 0 -- +2.5 V. Here's how I want the response to look:
The output voltage will be sent to a frequency converter and on to a stepper motor driver. I ... |
H: High resolution ADC vs amplifiers
I have started a design for work where I want to interface some sensors, (strain gauge, bridge, thermocouple, low voltage stuff) to a national instruments sbRIO card. This card has analog inputs built in as well as DIO. The sbRIO can measure down to +- 1v and 16 bits, but in my exp... |
H: RC circuit with sinusoidal voltage - initial behavior?
For a simple RC circuit with a sinusoidal voltage source, the differential equation is: $$\frac{dq}{dt}=\frac{sin(t)}{R}-\frac{q}{RC}$$ When I plot the solution to this differential equation using euler's method, I get this:
I'm confused as to what is happenin... |
H: Converting 3.3V signal to 5V with tri-state
I need to buffer and tri-state a 3.3V 8 bit signal, and shift the output to 5V (when the buffer is not in tri-state).
I am using a CD54HC373 buffer and 2 BOB-12009 logic level converters, but I can't find a way to output a 5V signal.
I have tried to route the signal in 2 ... |
H: Inexplicable base bias
I have a common emitter amplifier on my breadboard (the same circuit as the image) with the following values: C = .01uF, R1 = R2=15k, RL = 5k, RE = 1k, and Vcc= 10v.
The reason I have R1= R2 is I want VB = 5V. (Base voltage)
The reason I have RL=5k and RE= 1k is i want the gain to be -5.
Howe... |
H: how do LED controllers work
I’m trying to find out if a device only draws the watts it needs to run or if it takes all available
For example
I have led light that’s says max 0,75 watts and the led controller says output 144 watts will the device received 144 watts or will it only take 0,75
So I’m wanting this htt... |
H: NMOS/PMOS Saturation
If I recall correctly, saturation occurs if \$V_{GS}>V_{TH}\$ and \$V_{DS}>V_{Dsat}\$ for NMOS. But is there an upper limit for the voltage? Like, when does a transistor not saturate after continually increasing \$V_{GS}\$?
AI: For NMOS, the conditions \$V_{GS}>V_{TH}\$ and \$V_{DS}>V_{GS}-V_{T... |
H: What is the purpose of \$C_E\$ in this circuit?
I understand it acts like a filter for \$R_E\$, but what is the point?
AI: In DC analysis, capacitors are taken as open-circuit. In small signal low or medium frequency AC analysis, capacitors are taken as short-circuit.
So, as @nidhin explained, CE shorts RE in AC.
W... |
H: Why doesn't my operational integrator work?
Here is the schematic I'm following, to build an operational integrator.
(Image source - Electronics Tutorials)
I'm using a LM358N IC which has 2 op amps. Below is a crude drawing of my connections.
I don't seem to get what I want, when I feed a square wave signal 0 to 5... |
H: Is it ok to mix converter and extender cable with different amperes?
I have a charger for my laptop which needs a converter to hook up to local sockets.
On the converter it says 250V and 10A
I have an extension cable that says 250V and 16A
Is it ok to plug my converter into this extension cable?
Thanks
AI: Yes, can... |
H: EEPROM Interface confusion with Address?
So im researching how to interface with a EEPROM Chip via I2C with an AVR (Still learning a lot of the interfacing).
Anyways, the AT24C16 for instance (or that family of EEPROM) seem pretty popular. I looked at the datasheet and it mostly made sense besides one part:
So I t... |
H: How to connect a CR2012 coin cell battery with a PCB?
Im trying to build a flat, battery powered PCB assembly that fits into a small gap of approx. 2mm. I have found the CR2012 coin cell with a thickness of 1.2mm, which would be a good fit in terms of size and energy.
My problem is that I have no clue how to conne... |
H: Remote Start for my Dust Extractor
I have a 1.5kW 220VAC 1 Phase dust extractor. It's controlled by what looks like a DOL switch KJD17B/5T (so I assume the 5th terminal is an overload).
KJD17B Datasheet
Wiring diagram on duct collector:
From what I can see it's DP/ST and has L/N In and L/N Out and then a 5th conne... |
H: Machine learning for floorplanning
I have an educational assignment to make an floor-planning tool.
Can I use machine learning in some part of the algorithm? For example, I was reading the book Algorithms for VLSI Physical Design Automation by Naveed Sherwani, and here's a quote from there:
Initial estimate on the... |
H: Extension of Audio Amplifier's Bandwidth
I am curious, whether extending audio amplifier's BW (bandwidth) beyond 20 kHz has any benefits compared to 2Hz-20kHz audio BW amplifier?
Some say that high-frequency -3dB point should should be 30kHz, others say 50 kHz, some say that it shouldn't go further than 100kHz.
I h... |
H: How to derive cutoff frequency equations from the transfer function
I am working on a problem from the textbook Electric Circuits 10th edition
simulate this circuit – Schematic created using CircuitLab
I am trying to figure out first how to go from the transfer function to the magnitude. It's almost as if the deno... |
H: What is the minimum output frequency according to this datasheet?
Can this DDS output down to 0.05Hz sine?
I think the resolution is 0.0291 Hz. Does that mean that is also the miimum freq. it can synthesize?
AI: Yes, at a clock frequency of 125 MHz.
You can always run it at a lower reference clock frequency — the m... |
H: Frequency vs time constant
What happens when I have a low pass filter with R = 1kΩ C = 0.1 µF and I input a square signal with different frequencies? Will the time constant be the same for all frequencies?
τ = 100 µs for 1 kHz but when I increase the frequency τ starts to decrease on my oscilloscope. I thought τ wa... |
H: Using an opamp with fractionnal gain with supply less than input signal
Let's say we have an AC signal that can swing from -15v to +15v max peak to peak. If I use an opamp with the power rails to -5v and +5v, can I get a non clipped output signal if I use a gain of 0.333? Or will op amp failed to recognize anything... |
H: Finding the specific Turn Ratio of a Transformer
I'm finding the turn ratio for a Hammond 166G28 28VCT transformer. I already had calculated the voltages for the Primary and for the Secondary and I divided them and got 3:1 ratio for the outer loop (Green to Green).
Where can I find this turn ratio from the transfor... |
H: STM32F407 USART Interrupt config
Is it possible to Enable multiple USART Interrupts simultaneously by CMSIS USART_ITConfig function? I mean is it correct to utilize USART_ITConfig like this :
USART_ITConfig(USART1,USART_IT_TXE|USART_IT_RXNE,ENABLE)
or i should call USART_ITConfig function for each interrupt to en... |
H: Legal obligations when designing electronics
I'm planning on releasing a USB powered device, basically a AVR ATMega2560 µC with a FTDI FT232RL chip powered by USB-C.
Although I'm comfortable with the safety of the device (has fuses, ferrite beads, etc.) I'm not sure what are my legal obligations regarding consumer ... |
H: Amperage discrepancy on computer PSU
I have a 500W PSU that has both 12v and -12v supply rails with the dual +12v rails rated for 360W (20A each) and a single -12v rail rated for 9.6W (0.8A).
My question is; if I was to power something using a +/-12V rail voltage what would the maximum ratings of the supply equate ... |
H: LC filter applicability for power to output cables
I am designing a circuit that has a 240MHz MCU and some cables going to sensors so I am wanting to reduce the clock noise getting onto the supply line and going out the cables by using an LC filter. This seems to be a reasonable approach to me but my searches are ... |
H: Does somebody have a schematic for a stereo electret condenser microphone?
I’m trying to use a Cmoy headphone amp (built around an OPA2227P chip) as a hard-wired in-ear-monitor.
I bought a stereo electret condenser microphone from Jaycar this afternoon, but I can’t get any response from it when plugged into the am... |
H: DC motor H-Bridge - Snubber Cap
I have breadboarded a simple H-bridge shown further down using the mosfets linked below the schematics.
The prototyping motor is a DC 12V 1A (NO LOAD) Motor Pictured below:
Ultimately I ultimately want to use the motor pictured below:
(so if you have tips concerning this motor and h... |
H: Scenarios where Inductor back EMF would result in damage of circuit or component
Let's say that there is a simple circuit with the following components (ignore values):
LEFT: a simple power supply (assume DC)
TOP: load (resistor) and inductor
RIGHT: switch
BOTTOM: load (resistor)
simulate this circuit – Schemati... |
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