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8 views

J link not working when PCB is powered with a 3v3 smps

I am programming a stm32 (2 wire SWD: SWDIO and SWCLK) series MCU with a j-link V2 i cut off a nucleo board. I usually just connect the 3V3 supply off of my arduino, but atm i am trying to make a box ...
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0answers
9 views

System architecture for varying number of peripherals

Imagine that you making a hardware system, which you need to control/monitor through the PC. There are multiple peripherals, which you need to control, but the number of them changes depending on the ...
-2
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0answers
11 views

2.4g radio transmitter and receiver circuits

i have a drone which is controlled with remote using 2.4g radio signals but i don't have the remote so i want to make one on my own but ran into problem with the radio circuits, is there any ...
0
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0answers
11 views

12 awg galvanized steel high tensile wire okay for running 12 volt 7amp dc?

I need to run 12vdc about 50' along a fence that already has several 12 gauge galvanized steel wires running on it. Going to be pulling less than 7amps at most. I can make sure the lines are not ...
0
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0answers
15 views

Find location of wire break in low voltage wire buried in garden grass

I have a Flymo 1200R robotic grass lawn mower. The auto mower detects the boundary position of the edge of the lawn through a low voltage electrical wire that is buried close to the lawn edge which ...
0
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0answers
14 views

Is there any problem with the below circuit for controlling power supply (as a load switch)?

Hi, I am using this circuit to switch power supply to a load. I have gone through the datasheets and this looks likes it is okay. But, could someone please confirm if the the circuit used is alright? ...
1
vote
1answer
18 views

LTspice - Measuring the resonant frequency

I would like to measure the resonant frequency automatically in LTspice, i.e. with the command ".meas" of the following waveform. Is it possible to do it by using the FFT plot? I have tried ...
0
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1answer
15 views

RTC time is not kept in Stm32f103 by vbat

I am using stm32f103c8 and External Clock Crystal (LSE). I connected the Vbat with a 1220 coin battery. But when I turn off VDD and turn on the micro again, the time and date are all zero. Why time is ...
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0answers
11 views

Automotive Sensor Output

Why does the automotive industry sticks with 5V sensor outputs instead of something like 4-20 mA? Wouldn't it be a solution less prone noise? What are the advantages in using a 5V output instead of a ...
0
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0answers
17 views

Will adding a resistive load to a lighting circuit stop my electronic dimmer from leaking current to my LEDs?

I changed my bedroom lights yesterday for 220V 7W dimmable LED lights. My bedroom dimmer is an electronic type (LightwaveRF). In the pitch black, last night, I could see the lights faintly glowing/...
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0answers
36 views

What is this UPS communication IC?

I'm looking inside an Inform brand UPS. On its communication board there are 6 chips. Four optocouplers, one NE555 timer and a mistery IC, pictured below. The communication board only has the USB-B ...
0
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1answer
26 views

I2C Communication in AVR

The first step in a TWI transmission is to transmit a START condition. This is done by writing a specific value into TWCR, instructing the TWI hardware to transmit a START condition. Which value to ...
0
votes
2answers
31 views

Requesting Advice For Selecting And Sourcing A “Medium Torque” Motor

For a prototype project I'm building, I need to select a motor. I'm not familiar with different types of motors, so I have been trying to do some research. However, most of the stuff I have been able ...
0
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0answers
26 views

Windows calculator using engineering notation [closed]

I just wanted to hear if anyone can recommend a free, good electrical engineering calculator program for Windows (I know of Mathcad, but that is expensive)? Specifically one using engineering notation ...
0
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0answers
24 views

Serial nor flash memory MT25Q with microcontroller software development?

I am working on micron,s serial nor flash memory of 512Mb with renesas microcontroller,I need to write some data onto flash memory and read it back.As per standard method of working with flah memory ,...
0
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1answer
33 views

What are the dangers of emulating a battery with a step-up transformer and a 5v power supply?

I take long timelapses, for astrophotography. My camera's batteries are irritatingly short-lifed for this purpose, and so I wanted to try an alternative. I found .stl files for 3d printing the form ...
0
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1answer
30 views

Increasing the input impedance of analog input using an op-amp buffer

I'm trying to sample a 0-10V DC voltage as an input to my circuit. I use the following circuit to achieve this: simulate this circuit – Schematic created using CircuitLab The problem I have is ...
0
votes
1answer
33 views

Protecting circuit boards against shock?

Our company have been designing and manufacturing custom circuit boards for some 10 years now, and up till now by far the most common reason for board failure has been a mechanical shock - heavier SMD ...
0
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2answers
32 views

What component on an IR sensor module defines the set frequency of the IR sensor?

I am very new to all this so any and all help is appreciated. I am planning to make an proximity IR sensor using watching some DIY stuff online and i was wondering what component on the sensor module ...
0
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0answers
34 views

High current buck converter

I am looking for a solution to step-down the 12V 82A from a server power supply to charge a 3S2P supercapacitor to 8.1V. Not sure which buck converter to go or if there are any specific limitation to ...
0
votes
1answer
38 views

(Experiment) What if I run a DC motor with unfiltered sine pulse DC voltage?

I have read a lot about using high frequency square/rectangular wave pulsed DC for motor speed control aka PWM-ing, but my question is a bit different. What if I run a DC motor with a low frequency ...
1
vote
1answer
68 views

What is the purpose of these capacitors?

I have an amp (denon pma-1060) that has small 330pF ceramic caps directly soldered between it's speaker outputs and the chassis. But I don't know what is the purpose of them. Why are they there?
0
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0answers
35 views

How to increase Vdss of power MOSFET?

I want to build a Tesla coil with mains voltage. I found a schematic online but it uses an irfp460n MOSFET which can handle 500v (Vdss) but I only have couple of irfp260n and irf250n MOSFETs with 200v ...
0
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0answers
34 views

Current source with variable frequency

My application requires a current source with variable frequency. The amplitude of current will be around 10nA. The frequency of current to be more than 100Hz. I'll be highly obliged if someone helps ...
0
votes
1answer
24 views

Essential difference between normal irda mode and low-power irda mode?

guys, I'm learning stm32f401x mcu. All I have is an rm0368 reference manual pdf file. No mcu chip right now. From the manual, I learnt that PSC instead of ...
0
votes
1answer
51 views

PCB Layout - Transistor to convert analog signal to digital pulses - how to connect emitter GND

If have designed the following circuit to convert a certain analog signal of an amplifier to digital pulses. The circuit works well - except for one point. My prototype PCB has 4 of these amplifiers ...
1
vote
1answer
33 views

How to implement an interconnection matrix in VHDL?

I was reading through the documentation of the AXI standard when I came across the interconnection matrix shown below. In short, the interconnection matrix provides a path for several masters to ...
2
votes
0answers
45 views

Can a bypass capacitor be omitted if the IC is very close to the output cap of the supply?

Hello I was wondering if i can ommit the dedicated bypass of a specific IC if the IC is very close to the output capacitor of the supply rail In the immage above i have an LDO and its 0.1 uf output ...
0
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0answers
27 views

what could be the reason that a bench power supply is not showing any reading on its screen?

So It's my first time dealing with those "bench power supplies" I got this model ==> DAZHENG PS-1502D and for some reason when I try to scroll the voltage bars It is not showing any ...
0
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4answers
65 views

Is it possible to wire a DPDT switch so that each position creates an output? (3 outputs)

I am controlling three LEDs, and need to be able to toggle between them individually with a switch. Is this achievable with a DPDT switch? I'm not sure where I can find a switch that has one input and ...
0
votes
1answer
32 views

Can i tie the enable pins directly to the rails?

i am having trouble with the spaces on my circuit and removing the two pull-up/down resistor on the enable pins would solve my problem ( if of course it doesnt cause other problems). I was wondering ...
2
votes
2answers
139 views

BJT npn transistor circuit analysis

I'm trying to solve the following circuit, obtaining all the currents and voltages. I'm using mesh analysis method, but I'm ending with wrong results. So I assumed by default a clock-wise loop for \$...
0
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0answers
34 views

The microchip Bluetooth?

I am beginner in electronics, I am wonder about microchips that can transmit data between themselves using Bluetooth. I want to play around with them like the estimate connection, send data, receive ...
0
votes
1answer
60 views

Is it common for such basic TTL gate chips as 74LS32, '08, and '86 to be broken?

I have too many failures with very basic gate chips, while the more complex chips seem to keep working fine. And I find that very puzzling. These aren't even CMOS where I know that a static discharge ...
1
vote
1answer
31 views

Connect multiple earphones (with microphone) to one computer

I would like to connect up to 4 pair of earbuds (the in-ear type, stereo, with a TRRS connector and a tiny condenser microphone located along the cable, think iPhone wired earbuds) to a single ...
-1
votes
0answers
23 views

What is the difference between Rcw-0001 and HC-SR04 module? [closed]

I am going to buy a distance sensor and there two are available in shop. Both are distance sensors. I want to know the difference between the two sensors.
0
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0answers
36 views

Modding a 12V 4.3" LCD monitor to run on 5V

I've bought a 4.3" TFT LCD Car Monitor for a project, and The box says it runs on 12V(+/-10%). I've tested it for a bit and It even runs on as low as 6volts.. I've read multiple threads on forums ...
0
votes
1answer
28 views

SOP-4 Package Footprint Standard

I've got a TCMT1102 Vishay optocoupler. Its a 4-pin SMD part but there is no standard package type associated on the datasheet - i.e SOP, SSOP, TSSOP etc. Vishay has a footprint document that ...
-1
votes
3answers
57 views

Accurate way of measuring liquid volume with arduino

An Arduino project of mine involves measuring the amount of water that falls through a liquid dispenser. It is imperative that this value is EXACT since this will be used for further calculations. Now,...
0
votes
1answer
40 views

LockIn Amplifier Noise measurement

On my understanding, a LockIn amplifier use an internal (or external) signal source, set to a given frequency, say x. The system locks into that frequency, which means only that frequency can be ...
0
votes
0answers
46 views

What capacitor should I choose for mitigating frequency issues?

I'm doing this project where I'm replacing original NiMh battery (6V pack made up of 5 units of 1.2V cells) with a modern LiPo one. I'm using a pouch style battery, which has 3.7V that is definitively ...
0
votes
0answers
11 views

PowerElement footprint confusion

I am attempting to use some of ERNI's PowerElement parts but the associated datasheet and catalogue does not appear to be clear on the associated press fit feet https://www.erni.com/en/products-and-...
-2
votes
1answer
60 views

How do I wire this switching power supply

https://www.ebay.co.uk/itm/124258506002 How do I wire this power supply? It doesn't seem to have any connections and in my mind, it needs two for mains voltage, 2 for 12v out.
-1
votes
2answers
97 views

Instrumentation amplifier didn't fix my ADC crosstalk, and I don't understand why

A previous iteration of my circuit was as follows: I am sensing DC voltages across 6 variable resistors (1kΩ Pt RTDs) The 6 resistors are connected in series; the series is connected to a current ...
0
votes
1answer
50 views

How do I change the crystal frequency of an esp8266?

I'm new to microcontroller in general and after playing around with an arduino I would like to go further by using an esp8266 resp. ESP-WROOM-32 and play around with it. I'm programming them via ...
-2
votes
0answers
61 views

Help me understand what is this device on utility pole [closed]

Can someone help me understand what is the device from the picture and what is its function? It was added by the electricity company after they upgraded the power wires and poles. All wires go to the ...
0
votes
1answer
36 views

Differences between ripple counter (e.g. 74LS161) and CMOS 4040

I have been using the 74LS161 for some tinkering, and then switched to the CD4040 because it had 3 times as many counter stages in the same package size, and I don't need preset for my purpose. Early ...
2
votes
0answers
39 views

Problems regarding KCL & KVL

Question: Below figure represents an approximate equivalent circuit of a field effect transistor amplifier. Using KCL find the output voltage \$v_2\$ in terms of input voltage \$v_1\$. My try: I ...
0
votes
0answers
27 views

Charging 18650 cells with LM2596

I have 18650 (UR18650F) cells I would like to charge using a LM2596 DC-DC Step-down Adjustable CC/CV board, which has 3 adjustable pots. The instructions on using it for charging are as follow (quoted ...
0
votes
0answers
37 views

Chaos circuit solving for the values of capacitor and resistor

Is there any way to make a circuit of chaos based system of differential equation, and choosing the values of capacitor and resistors? I tried to solve this question and search as well but still not ...

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