# All Questions

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46 views

### How to use separate power source for raspberry pi + Arduino and motors as shown in the image below

Is it possible to make this circuit or will this work? I want to power the raspberry pi and Arduino with a powerbank and motors with a separate battery through the driver module as the diagram shows. ...
21 views

### I want to design a Protection circuitry for ICR18650 Lithium-Ion cells

I am trying to design a protection circuitry for ICR 18650 Lithium-Ion cell (3.7V,2200mAH). I made a battery-pack by connecting 3 cells in series to get output voltage of 11.1V. During charging/...
53 views

### 12v DC motor active indicator

I have two 12v DC motors sharing the same input power supply connected in parallel sharing and spinning the same load thus splitting the work. How can I attach an LED to each motor to inform me that ...
31 views

### How can I synthesize a 10-Variables function using 6-input LUT + MUX 2_1

I need help to synthesize a 10-var arbitrary function using LUT-6 + MUX 2_1
35 views

### Unexpected voltage drop in the output

I've created a power converter based on an LM5085 IC. The converter was designed so that it can work with 24V in the input. Here is my schematic. Requirements: VIN - 24V Vout - 3.3V Imax = 1A Imin = ...
54 views

### How can I lower the speed of a 220-240V (100mA, 16W) inline ventilator fan?

I have installed an inline fan (220-240V, 01.A, 16W) to draw air out of my kitchen to outside. It works well, but a little too well, and is noisy. So, I would like to reduce the speed somehow, say to ...
38 views

### How can I power an Arduino Uno using a 9V battery and a separate battery for raspberry pi 3

I want to power an Arduino using as separate battery power and raspberry pi with a separate battery
84 views

### Is all that matter inside a chip the wires?

I was talking to a friend earlier about a class I'm thinking of taking. However, he warned me against taking it. The class is about chip design, microelectronics, and the physics behind them. He said ...
30 views

### Li-ion charge / discharge circuit with ESP32 and MOSFET

Here is what I’d like to do: Wire a circuit that can either charge or discharge a single li-ion cell (3.0 to 4.2 V) or just do nothing at all. An ESP32 controls the circuit (max. 3.3 V). An INA219 ...
114 views

### firmware testing methods

This is my first question here from the community :) So I have inherited some bad embedded code, the whole firmware is a messy spaghetti state-machine that has an infinite number of states! and it is ...
47 views

### 1200W, voltage and cycle converter 220 to110

I have bought a Joule sous vide immersion circulator from USA. I want to use the device in India. I need to convert AC, 240V 50Hz to 110V 60Hz. After reading the literature on the company's website ...
25 views

### Arduino sensor labels: “s” vs “out”

On many Arduino sensors, there are most likely a port for, gnd, vcc, and signal/s. On some other sensors, I see there is an "out" replacing an "s". This confuses me because "s&...
18 views

### Number of read and write ports on L2 and L3 cache

I have an Intel Core i9-9900K processor (some specs here) and I'm trying to figure out how many read and write ports each level of cache has, for a personal project. I cannot find this in any online ...
30 views

### How to Simulate VHDL when Using a Vendor's Tool Generated Instantiation Code?

I'm working with a Gowin FPGA and they recommend instantiating block RAM. That sounds great, but how do I simulate that? I would expect there to be a library with the model for the instantiation ...
69 views

### How to easily connect to this PCB?

I got this board I need to connect to. The 3 connectors are about 5mm long all together. I can see bigger pins/connectors online but not this small. I did solder but it takes time to do so for every ...
42 views

### Ultra wideband development board [closed]

I want to explore UWB radar systems and looking for a development board. I'm specifically interested in getting access to the raw data, try out different pulse lengths (sub nanoseconds), and different ...
40 views

### How do I write the top module for this Verilog code

I am writing Verilog code for A 4-bit BCD adder. I am having trouble wringting the top module and understanding how to call the other modules into the top module. Here are my codes. ...
154 views

### Gray code usage in modulation constellations

When mapping symbols of various modulation constellations, Gray code is used such that - each adjacent symbol only differs by one bit. Why do we want small physical changes in the signal to correspond ...
31 views

### Can similar inductor value be used?

I found a schematic online of a 433mhz receiver which I am trying to replicate. 1 component is an inductor 16.6nh smd. However because I cannot find that exact value I was thinking to use an inductor ...
35 views

### Cell Phone Purse w/ Touch Screen Easy Access

Hi I want to make Cell Phone Purse w/ Touch Screen Easy Access in mass production . My question, what is the quality of plastic which used window in front of cellphone which is touch screen . Thanks
34 views

### LVCMOS line matching

I have this ADS6125 ADC it has internal registers which can be programmed. The programming interface is LVCMOS I am planning to programm the registers with a 10 kHz clock frequency. How tight does ...
58 views

### How to make a current source that supply constant current independent of a voltage power supply?

I want to design the simplest possible circuit that drives a led. The led must load the same amount of current whatever the voltage is at the input, between 5 and 9 Volts. The current could be 10mA. I ...
149 views

### Protecting circuit from piezoelectric disc voltage spike

I have a piezoelectric disc, and I'm trying to use to build a primitive sonar. I connected the disc to an oscilloscope and if I press very hard on the disc, I see that the voltage can spike pretty ...
44 views

### Power Supplyin parallel

Can you connect a Pyramid PS36KX 12-15V 32A DC Power Supply in parallel with a Tripp-lite PR 25 to get more amperage for my Ham Shack
36 views

### What is the highest possible optical output power of an SLED?

I am inquiring about this because I'm looking for a suitably high-power, large bandwidth light source for a fibre optic communication system I am designing. The distance the data will be required to ...
35 views

### How to crimp JST VHR series?

I need to crimp the 18 awg wires into the 3-pin female JST VHR connector, but have no clue as to how to do it. How would the crimp latch onto the JST housing? Can somebody point me to any helpful ...
94 views

### Details about driving circuit of mosfet

I want to know the reason behind why this elements are connected in mosfet driver circuit. Basically I want to know the use of this elements . elements are (1)R1,R2 and diode in parallel with them (2)...
46 views

### Finding the Thevenin Equivalent circuit

i found Rth to be 4kohms but i cannot seem to figure out Vth i short circuited the voltages sources and open circuited the current source to get Rth.
98 views

### Matlab Digital filter not working, how come?

Before reading any further, to give you on some insight on the output level of the oscilloscope picture's the ~340mV green signal is normal. If you know me I posted a question as to why its 340mV but ...
48 views

### Insulated TOP3 triac soldered to Aluminum plate — will it last?

So I ordered a cheap SSR from Aliexpress and it finally arrived. I immediately disassembled it to look what's inside. It wasn't so bad -- BTA40-800, MOC3063.. assuming the components are not ...
34 views

### Bootstrapping circuit in IR2101

Please explain how the bootstrapping circuit help in driving both the mosfets connected to IR2101 driver.Please explain this by taking an example of any voltage so that I can understand easily....
49 views

### What does a transceiver like MAX 483 do, especially when it is connected to RS-485?

I cannot understand the principle that the transceiver uses. Why do we need to connect it to RS-485, and how is the data transmitted? I mean how does it transmit the data and why? It is like I cannot ...
67 views

### Op amp controlled LED current

I'm trying to implement a simple current control circuit for an LED from here: https://www.allaboutcircuits.com/technical-articles/the-basics-behind-constant-current-led-drive-circuitry/ The ...
83 views

### NEED HELP FAST connecting three-wire wiper motor to an AA battery holder

I'm new here and I had a problem that needs urgent attention. I have a three wired wiper motor that I want to get moving. I want to use my AA battery holder but the wires didn't work when I connected ...
45 views

### Charger too powerful?

I have a 24-volt battery-powered electric lawnmower. The batteries are two 12-volt 20-Ah AGM batteries in series (the negative post of one is linked to the positive post of the second). I plugged in ...
37 views

### Can a sensor with twice the resolution needed fullfil a required applicaton? [closed]

Is it correct to state that if I have a sensor with twice the resolution needed I could still use it for a given application as long as I decrease the gain in 2?
41 views

### Shortcircuit protection using transistors

I'm designing a short-circuit protection circuit for x2 AA battery (3V) and I'd like some tips from the community on how can I make it a low power mode circuit. When V_out is short cirtcuited, the ...
21 views

### Why do we use PQ and PV buses when solving a power flow equation?

It seems like it would be much easier to just use the admittance matrix and measured voltages to find all the currents and then just use that to get all the power flows. Why not this over going ...
27 views

I'm not sure the cause but I'm having troubles getting a consistent voltage reading from the ADC pin of my STM32F103(actual bluepill and not a knockoff). Here is the serial output from my board (each ...
37 views

### nRF24 PCB Antenna Choices

I am trying to create RF module using the nRF24L01P. I am trying to maximize the range while still using a trace antenna. My plan is to combine the simple trace antenna design with the long range ...
48 views

### input capacitor for buck converter

To calculate the input capacitor for buck converter, I follow TI Application Report SLTA055–FEBRUARY 2006 "Input and Output Capacitor Selection". It says to determine the input capacitor &...
28 views

### Can I change a frequency band of an EQ board?

Is it possible to change one of the frequency bands of this EQ board? In particular, the low frequency adjuster is 100Hz and I want to make it 60ish Hz. My understanding is that i need to meddle with ...
30 views

### Current Starved inverter with current sources connected to Vout node

The figure a is the conventional Current Starved inverter with M1 and M2 acting as current ...
11 views

### Proteus - Copied subcircuit does not work even after renaming

I have a problem with subcircuits in Proteus software. I know I should change the name of the subcircuit to work and it gives error when we don't. But even when I change name and run simulation it ...
18 views

### Replacing an analog pot with a digi pot in a flying drone controller

I'm working on a project at the moment and I'm supposed to change the analog pot on the controller with a digi one. My question is does installing the digi pot changes anything in the controller ...
27 views

### How to handle delta function after finding the impulse response?

I am pretending that laplace does not exist because I am being tested on these concepts separately. Essentially, I have solved for the step response of a first order circuit and found it to be: v_{c}...
19 views

### How do I combine outputs in Simulink by changing a specific parameter?

I am studying a Cruise control system, and I want to change the coefficient of rolling friction and put them together in one graph keeping the remaining parameters the same. How do I store all the ...
37 views

### What does “PWREN”, “TXDEM”, “CTS” and “DCD” means? [closed]

In the attached image there are several connections to an electronic device. I suppose "PWREN" means "power in" "Vcc" means "applyed voltage" "GND" ...