All Questions

1
vote
0answers
29 views

Offline (unpowered) storage time limit for NAND based drives?

What's the storage time limit for NAND based drives? Like Samsung EVO 850 or something similar? Also, since USB storage drives use NAND flash... what's the storage limit on them as well? When I ask ...
0
votes
0answers
29 views

Wifi versus Zigbee versus Bluetooth for real-time data sampling

I am working on a project that I would like to send and receive data between a microcontroller (ESP32) and a PC. The microcontroller supports both Wifi and Bluetooth. If I send one single data point (...
0
votes
1answer
37 views

Artec QDD2 reverse voltage problem

Good day everyone, I have an Artec QDD2 overdrive circuit and I recently powered it up with reverse voltage by accident and it doesn't give any sound on the stages of distortion, however it is ...
0
votes
0answers
49 views

PWM Not Driving IRL520N MOSFET

I am trying to switch a IRL520N logic-level MOSFET using a 0-5V PWM signal from my microcontroller (PyCom FiPy). I tested just the MOSFET with a 10 Ohm series gate resistor and my load is a 9-15V ...
5
votes
2answers
305 views

Isolating an audio line connection with two capacitors

I've looked at several questions, such as: Isolating audio ground between devices I want to connect an input and output audio line signal of two different devices. The earth potential of their audio ...
0
votes
0answers
36 views

Must film capacitors be derated according to the voltage applied? [duplicate]

I know electrolytic capacitors must be derated according to the applied voltage, with some losing a significant part of their nominal value at high voltages. Is it a similar case with film capacitors?...
7
votes
3answers
2k views

If a lithium cell is said to have a capacity of 20 Ah, does that mean all 20 Ah can be used?

Toshiba's SCiB 20 Ah Lithium titanate cell is said to have a nominal capacity of 20 Ah. The cutoff voltages are 1.5 V and 2.7 V. Does this mean that all 20 Ah of charge exist between those two cutoff ...
2
votes
0answers
46 views

Anyone can ID this “FCI” connector in a Fiat 500 parking light?

I'm looking to replace the terminals but can't even ID the connector. Can get a connector kit from the dealer for $70 but just need one 50 cent terminal.
0
votes
0answers
53 views

Meeting Setup/Hold Time according to time analysis

I am trying to interface an IC with an FPGA. Both the IC & FPGA run at 66 MHz with no clock skew between them and the propagation delay of the data lines is negligible, since the length of the PCB ...
0
votes
1answer
40 views

Experiment with transformer: meaning of some physical quantities

I'm doing some experiments with a transformer, measuring some physical quantities. First I did an experiment with the transformer in open-circuit. I determined the voltages and currents on both ...
1
vote
0answers
39 views

Voltage Across NMOS and PMOS Transistors

So I have the question above concerning an NMOS and PMOS transistor. The goal is to find V1 and V2 in steady state. My understanding is that because the gate voltages of zero and Vdd are there, the ...
1
vote
1answer
36 views

Alternating Voltage

Is AC the same as an alternating voltage ?
1
vote
1answer
34 views

Will my zener diode work again with a polyfuse after a overvoltage?

I am trying to make a simple overvoltage & current limiting circuit for my PCB. I made the following circuit. The zener will break down and conduct current to ground. Since its resistance has ...
0
votes
1answer
44 views

Make ground signal last longer?

I'm trying to figure out a way to make a ground signal last longer on my car. I'll explain what is happening and what needs to be done. I'm hooking up an factory alarm on my car. It uses a negative ...
1
vote
1answer
58 views

Simplifying H-brigde circuit

I am currently trying to build a PWM H-bridge, it has a power line of 12 V and the arduino uno provides the PWM. The MOSFETS I have are: IRLZ44S (N-channel) and FQD11P06TM (P-channel). Basically, the ...
2
votes
1answer
32 views

Using Diode As a Solar/Lightbulb Cell

...hi :) a few days back I saw this Instructables.. https://www.instructables.com/id/Using-Diode-As-a-Solar-Cell/ ...so I started to experiment how this can be used to charge a cellphone or a ...
0
votes
0answers
39 views

Can you convert a small gas engine 220 volt starter to work with 120V?

My snowblower has a broken connecting rod so time for an engine replacement. Good price on a new replacement 11HP gas engine on Ebay but it's set up with a European 220 volt starter. The 120 volt ...
0
votes
0answers
18 views

Mixing audio intercom with music to my earbuds

I'm flying allot and I'm trying to find a way to use my Bose QC20 earbuds during my flights with my aircraft so I can listen to both my music and the airplane Audio. I'm planning to make a microphone ...
1
vote
1answer
28 views

outputs from Verilog finite state machine changing very late, possible reasons?

I am working on a finite state machine that is written in Verilog and being simulated in ModelSim. This FSM is for implementation of a SISC processor. In this implementation, we are using arithmetic ...
1
vote
0answers
15 views

Using a switching DC-DC converter in high dynamic range current/voltage sensing

I'm thinking of making a power meter circuit which will have a high-side current-sensing amp (LTC6102), a resistive voltage divider for sensing the voltage, a dual op-amp (OPA2365) as a buffer for the ...
0
votes
1answer
35 views

samsung galaxy phone jack pinout to pc

I'm trying to get the audio-out from a Samsung Galaxy A4 into a PC for recording with Audacity. I've tried a 3.5mm 4-pin (TRRS) and 3-pin (TRS) cable into the MIC input jack on the PC but none of them ...
0
votes
0answers
36 views

H-Bridge Low Side Sense Resistor - Position of Resistor and Bulk Capacitance

My question regards the considerations required in determining the location of a current sense resistor on the low-side of an H-Bridge. I've presented two scenarios. Details: The H-Bridge load is a ...
0
votes
0answers
42 views

Crystal Oscillator (STM32F4)

I am currently working with a STM32F427 MCU and have a few questions in my mind. Is my schematic for the HSE correct? Can you tell me, why some schematics on the Internet use a Resistor in series ...
1
vote
1answer
57 views

Why does a virtual ground form for differential pair?

In the schematic above for MOS differential pair, why does virtual ground form? The book says because of symmetry, but I don't really understand it.
0
votes
0answers
56 views

What type of ribbon connector is this?

I'd like to know what type of cable this is. It looks very similar to the types used in phones and tablets and is for a camera. I need a replacement and would appreciate any help to locate the correct ...
0
votes
1answer
85 views

Where do I place the on/off switch in a multi voltage circuit?

I've got a simple Arduino setup where I need to supply a 3.3V Arduino with adequate power - and at the same time provide higher voltage to a sensor which needs 5V. The Arduino is powered by bypassing ...
3
votes
1answer
51 views

Component identification, on USB 2.0 data lines

The component i'm trying to identify is on the usb 2.0 D+ and D- lines of a nintendo switch, its got two ground connections and has the letters DUG on it. Can anyone identify this component?
0
votes
1answer
74 views

PLDs, DSPs, MCUs, MPUs and SoCs Typical Application [on hold]

PLDs, DSPs, MCUs, MPUs and SoCs are all embedded devices, they can be programmed / configured to achieve a specific application. I've worked with MCUs and FPGAs in the past and realized that they are ...
0
votes
1answer
33 views

Why does the output voltage of my linear gain amplifier depend on the JFET gate voltage?

I am trying to build a linear gain voltage controlled amplifier using an N-channel JFET as a voltage variable resistor (see circuit below). As the circuit is set op now, I would expect Vout to be ...
0
votes
0answers
56 views

Circuit that averages voltage

Suppose we have an oscillating signal V(t) with V(t) >= 0. I'm looking for a circuit that averages this signal over a given time so that I can read out the average value directly using a simple ...
1
vote
2answers
86 views

How to measure the battery voltage while charging

I am designing a battery charger with 48 volt 10 amp output. I am controlling the buck converter pwm using PIC controller. During charging the battery's current and voltage have to be constantly ...
0
votes
0answers
29 views

LTSpice PWM Signal Showing Capacitor isn't Fully Discharged

I'd like to create a pwm signal input to mimic a real life situation of a pwm input that shows the capacitors aren't fully discharged. Please see the image below. I am currently able to create the pwm ...
1
vote
0answers
36 views

Checkered / square-patterned copper plane on a PCB [duplicate]

The Verge has published photos of the original iPhone "dev kit". The board looks like an ordinary development kit to me, however there is a strange pattern of squares on the topmost layer. I know ...
0
votes
1answer
33 views

Protective-Earthing the chassis with the earthing point being the star-point - How does it keep the Chassis at Earth potential?

I always understood that one of the two purposes of protective earthing is keeping the electric potential difference between the chassis of a devide and the ground (the ground I am standing uppon ...
0
votes
2answers
46 views

Is the Roll-Off of Butterworth Filter of degree N always N*20db/dec?

I am trying to implement a fourth order Butterworth high pass filter under a Sallen-Key topology. Two frequencies, one at the passband and another for the stopband, are set to be at some specific gain/...
0
votes
1answer
53 views

Voltage divider on differential op-amp

I need to measure the voltage across the R2 (VA - VB) but it is above the common mode voltage range of op-amp. simulate this circuit – Schematic created using CircuitLab How could I do that? ...
0
votes
0answers
58 views

Can open-circuit voltage be treated as voltage to find power dissipated? [duplicate]

Can open-circuit voltage be treated as voltage to find power dissipated? I combined all the resistors (including Vlamp) to get one resistor of 40/6 Ohms (Correct me ...
0
votes
3answers
32 views

Can a Current Limiter Power Thermistor be used in line to reduce the brightness of a 120v incandescent bulb?

I have an application were I do not have the room for a dimmer switch but need to reduce the lumens of a 120v 25w incandescent bulb just a bit. There used to be a product called the Bulb Saver Button ...
6
votes
3answers
2k views

Can I run 125kHz RF circuit on a breadboard?

I was wondering if making a low frequency RF circuit on a breadboard is viable.
0
votes
1answer
49 views

Visualise a bit pattern

My objective is to send a bit pattern of 1000 bits from one microcontroller (PIC or Atmel) to another one using the SPI method. How can I visualize the bit pattern so I can find the errors of ...
1
vote
1answer
56 views

How do I treat this “lamp” to find power dissipated?

This is my circuit. I need to find the power dissipated by Vlamp. So the lamp turns on if the Vlamp is more than 2V. When the ...
3
votes
1answer
51 views

What is the difference between 'x' and 'plus' symbol in the block diagram

Generally speaking, what is the difference between the 'x' and the 'plus' symbol in a closed loop block diagram? For example, in (https://ieeexplore.ieee.org/document/6983570) , what's the ...
1
vote
1answer
42 views

How to check the flow of assembler instructions execution?

I'm creating a project that uses I2C serial communication in assembler and I'm having some issues transmitting data and receiving back so I thought I should somehow debug the whole program, besides ...
1
vote
2answers
80 views

Why does the MIT Racecar not use the build in ESC?

MIT has build an autonomous RC race car. They put everything on GitHub. I have a similar project and therefor build one of those for my self (Almost the same but without TX1 and Sensors). I am ...
3
votes
1answer
226 views

Parallel Power Supplies with Ideal Diodes

I'm working on a project that operates at 5v - and can draw UP to 10 amps. Under normal conditions, it won't be doing that - probably closer to 3 amps, and (if configured for low-power) only 450mA or ...
0
votes
1answer
46 views

Debugging on STM32F103

I have been on this for about two days now and I'm so frustrated already I don't know what I'm not getting right. I want to be able to use the stm link utility with my stm32f103c8t6 so that I can use ...
-1
votes
2answers
113 views

Potentiometer for speaker volume (smoking) [on hold]

I have a little 100w siren for my little boys 12v toy car and i am trying to reduce the sound level So he doesnt wake the neighbours when he is playing. I got a 10k potentiometer logarithmic and put ...
0
votes
1answer
78 views

Analog implementation of imaginary roots in a transfer function

I have a simple boost converter, and from multiple papers I've read through, a Type 3 Compensator is recommended. I designed one in Matlab/Simulink, and it reacts very quickly. The problem is, when I ...
1
vote
0answers
37 views

How common mode choke helps in conducted immunity for power supply lines? (Automotive - 12V system)

Please find related circuit attached here: I have seen people using common mode choke on supply lines (between 12V (BAT+) & GND (BAT-)) for reducing conducted emissions by system over vehicle ...
0
votes
1answer
34 views

Why do we not consider Thevenin Voltage source while dealing with Dependent sources in RLC circuits?

"If no controlling current or voltage associated with the dependent source is of interest, we may simply find the Thévenin equivalent connected to the inductor and capacitor." This is what's written ...

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