# All Questions

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9 views

### Does 18650 cell voltage sag have a direct relationship with it's internal resistance?

When a cell is connected to full load does it drop some of its voltage due to internal resistance and quickly jumps back to normlal whenever the load is taken off??
13 views

### power consuption of internal 32kHz RC oscillator

I am looking for the typical power consumption of the OSCULP32K (Ultra Low Power Internal 32kHz RC Oscillator) of ATSAMC20J18A. Found nothing in family datasheet so far, only XOSC32K. Can I expect the ...
15 views

### A sensor for jaw/mouth movements in a mask

The mask I'm trying to build will display different lighting patterns. The overall goal is to synchronize these patterns with a musical/dance performance, so there were two options: either hard-code ...
12 views

### Drawing a single pixel using DMA2D

I'm trying to draw a single pixel using DMA2D. I did the following code it's not working at all. LCD Display Width is 320, Height is 240. I assumed a 1x1 pixel rect as a pixel. ...
12 views

### Conformal coating of shielded rf modules

What is the best practice to protect a circuit with shielded RF modules? I have a feeling that conformal coating is difficult since the shield is not sealed
17 views

### What is the problem in my timeout implentation?

I'm trying to use DHT22(temperature and humidity sensor). Here is it's datasheet DHT22 Datasheet In first few seconds. I can get values. But after a while it stucks in here: So i try to implement a ...
31 views

### why the voltage at the gate terminal is 1.8V irrespective of the 3.3V pull up?

[![the output of my GPIO is 1.8V which is pulled up to 3.3V using a 4.7K resistance and that gpio is connected to the gate terminal of a P-channel mosfet, when i measure voltage across the gate ...
26 views

### Industrial grade electric motor near 50mm outer diameter and 100Nm rated torque. Does it exist? [on hold]

I'm looking for an electric engine for industrial application to work in a machine where maximum diameter to fit it in is 53mm. While there is no length limitation it should have reasonable value, ...
16 views

### Mounting Problems SD Card and STM32F7 Discovery

I've got some problems with the FATFs library and the STM32F7 Series. I want to connect a SD-Card (32GB, SanDisk, FAT32) with the F746G-Discovery-Board to save some data on it. (at first .txt-Files, ...
21 views

### Automotive connector ID

I have a 1998 Dodge Durango and am swapping transfer cases. The new case (NP242) uses a 4-pin switch (see photo). Dodge discontinued the adapter harness some time back and I have not been able to find ...
39 views

### What type of fuse is this? [on hold]

I have a device that is missing a fuse (see attached pic). Could anyone point me to a site that sells it?
17 views

### Confusion with serial communication standards when sending sync serial data to a PC thorugh its serial port

When I read about SSI communication I can see that a pair is used for clock and another pair is used for data transmission as follows: On the other hand if I read about RS422 all lines are data and ...
11 views

### AT90CAN128 iocanxx.h vector numbers

The vector numbers in this header do not match the vector numbers in the manual AT90CAN128 doc7679 pdf Section 8.1 They appear to be one position out Can anyone advise on which is correct?
7 views

### Possible Issues with battery Powered sensor and collector star network

I am designing a wireless Sub-Ghz network consist of many battery powered sensor nodes with a single collector node. For lowest power possible, the sensor stays most of the time in sleep mode waking ...
34 views

### Transistor for USB Hub power control

I'm trying to add power control to a USB hub based on the Terminus Tech FE1.1s hub chip. From the datasheet, I know the chip supports ganged power control, so all ports share a single switch. That's ...
18 views

### Thermal resistance of Thermal Interface Material

Can anyone please give information how to calculate the thermal resistance of SIL PAD "TSP A2000" from make Berguist. from The data sheet its specified thinness is 0.254mm, Thermal conductivity (W/m-...
17 views

### Does CP2102N-QFN24 has native support for Android 8.0 or above?

I want to use CP2102N-QFN24 USB to UART chip with Android phones having API 26 and above. Does this chip has native support for Android phones with API 26 and above or need to download/install some-...
31 views

### Accelerating Graphics rendering in STM32F7

I have a framebuffer that is created on SRAM with LTDC that is everything is written to that buffer, images, icons,..etc. and get displayed to the LCD screen. That works fine. but the screen size is ...
51 views

### Correctly driving dual 7-segment display

After receiving some feedback on my other question, I have improved my design. I am still using a stm32f030k6 to drive a two-digit 7-segment display, but I am using the common-anode HDSM-291C in ...
24 views

### Derivation of diode voltage in three phase full wave diode rectifier

Considering ideal diode in 3 phase full wave diode rectifier we can present the system in picture below. I found the final equation for $v_{D6}$, but can not figure it out how it was derived. \\$v_{...
28 views

### Pulse Down a line with Series terminations between transmission lines

I am interested in a relative edge case in transmission line of a simulation. If send a pulse down the setup below, now obviously my rudimentary steady state electronics knows this is a basic voltage ...
33 views

### How to ignore an undesired short output signal coming from arduino?

I'm currently programming a Nodemcu ESP8266 board, fully compatible with Arduino IDE. The project drive a relay board with a GPIO pin set as output. You can see the board pinout in the following ...
78 views

### Understanding voltage

For the longest time I chose to ignore the true definition of voltage because it did not make sense to me to think of voltage by its definition. Most of the time, it made more intuitive sense to think ...
40 views

### How do I find the return loss of a transformer from its 4-port S-parameter data?

I'm looking for information on the performance of Mini-Circuits T16-1-KK81+ transformer. The transformer is well-characterized, Mini-Circuits provided both insertion/return loss charts and raw S-...
25 views

### DRV8889 SPI Commands

I've been having some issues diagnosing the relationship between writing to the registers through SPI commands and stepping the motors. That is, it seems like when I write SPI_STEP=1 (and STEP=1) to ...
44 views

### Real Power or Reactive Power in Superconducting Motors?

My circuits class is teaching that in AC power, there are two kinds of loads. One is a resistive load, with absorbs power at all times. The other is a reactive load, which absorbs zero average power. ...
46 views

### Designing a diode waveform shaping circuit resulting in specific transfer function

Below is the circuit I built, yet the solution has the resistor as a load resistor instead of as a current limiting resistor. I am wondering if this circuit will output this transfer function.
16 views

### What does “Current Detection” feature mean in KNX actuators?

I understand that KNX/EIB actuators are used to switch on/off lights in fancier homes. Some of these actuators have "current detection" feature, and some do not. What can that feature do? Is it ...
8 views

### How to use .meas statements to measure duty cycle in LTSpice

Would anybody be familiar with how to use .meas statements in LTSpice to measure the duty cycle of a square wave?
439 views

### Why do some switching regulator require tantalum or electrolytic capacitors instead of ceramic?

I'm looking at this switching regulator: http://www.ti.com/lit/ds/symlink/lm2675.pdf. For its input and output capacitors it recommends tantalum or electrolytic capacitors. It mentions in section 9.2....
71 views

### Driving two MOSFETs with one AND Gate?

I am designing a circuit to drive the brakes on a DC motor. The brakes are a 19.9Ω coil that is disabled when energized (think wheelchair motor style brakes). The brakes work on 24VDC. I have found ...
28 views

### How to connect a CMOS sensor to a OLED display?

I'm going to ask something I didn't find. Also my level of knowledge is basic, so I would appreciate the help. Do you know to connect a CMOS sensor like this: https://www.aliexpress.com/item/...
56 views

### How to model a real diode 1N4148?

In my university EE lab we were working with a 1N4148 diode to rectify half a sine wave and measure the RMS value of the current in a simple circuit. To the left is the circuit we had to make and to ...
27 views

### With a SMPS charging a capacitor bank. What is the power rating of the SMPS?

I'm working on a project to build a 24VDC to 250VDC switch mode power supply for the purpose of charging a capacitor bank. I'm trying to narrow down which SMPS topology I should use since they have ...
31 views

### How to obtain a high precision mV signal within a specific interval using a variable resistor?

I want to design a circuit which outputs a signal ranging from 0-70 mV using a variable resistor ranging from 80.51 Ohm - 183.05 Ohm and a supply voltage of 12 V. My idea so far has been to make a ...
19 views

### Would plugging or unplugging the Coax cable from router before turning the router off cause any damage to the router or the cable or anything? [on hold]

Would plugging or unplugging the Coax cable from router before turning the router off cause any kind of damage including electrical damage to the router or the cable or anything? Because I accidently ...
17 views

### Circuit not working: Differential impedance, or skew, or a different problem responsible?

For a hobby project, I am designing a circuit that converts displayport to APIX2, which is a serializer protocol used in cars' infotainment systems, mostly BMW. This is done by an INAP375T IC, APIX is ...
38 views

### Master SW (bit-bang) I2C with Interrupts?

I've written a set of "bit-bang" software routines for the PIC18F2620 device. These routines work well for reading and writing 24LC256 EEPROM and DS1307 RTCC devices for the most part. (I wrote this ...
32 views

### Differential to single ended digital signal

i have a 8GHz differential clock to convert to single ended. Is taking one end of the clock enough? what are the risks of doing so?
67 views

### How should I start an electronics project? [on hold]

Background I have limited exposure to practical and real-life electronics (particularly in the analog world). I haven't made something all by myself from the ground. So to remedy this, I want to make ...
63 views

### Isolated power supply with Vout = Vin

I need to create two isolated power supplies (so that one's electrical noise doesn't affect the other) out of my 12V battery. One has to be at 5V for some logic circuitry, and the other at battery ...
96 views

### Is there Mosfets for wires? [on hold]

Mosfets are pretty cool but they are either designed for circuit boards or for breadboard's. Is there a version of a mosfet that can be used for slightly thicker wires than what would be usually ...
30 views

### Convert a Dusk-to-dawn outlet device to Dawn-To-Dusk?

I recently purchased a Dusk-to-dawn outlet sensor (https://www.amazon.com/dp/B00002NB2X?ref_=pe_2640190_261118450_302_E_DDE_dt_1), but I'm wanting to convert this thing into a Dawn-to-Dusk device ...
60 views

### How can I reduce noise caused by shift register updates?

I have a couple of designs using 74HC595BQ-Q100,115 shift registers. Some are using the SO-16 package, some the DHVQFN16. Some have five shift registers, some have three. ALL have a significant ...
36 views

### PSC motor speed affected by capacitor?

I replaced the induction motor in my furnace (PSC type), and it was suggested that I replace the run capacitor at the same time. (They are both 20 years old). The new motor is a Fasco A136, ...
42 views

### Do I need a fork terminal to install #8 into an 38660 Molex Barrier Strip?

Can I strip a half inch of wire from a #8 cable and screw directly into a 38660 Molex connector? Or do I need to buy a spade terminal. This is for an AC connection to the back of a DC power supply, ...
42 views

### pid controller vs on off controller? [on hold]

I have read that both pid and on-off controller belong to the class of classical controllers but what are the differences between pid controller and on off controller? I think control valve is ...
98 views

### What is wrong with this circuit simulated in Proteus?

When simulating this circuit in Proteus, I expect the LED to light up when the switch is closed, but it does not light up. What am I doing wrong?