Questions tagged [circuit-design]
The process of creating a circuit to accomplish a particular task. When designing a circuit, one should consider how it should work, the target specifications, efficiency, cost effectiveness, code compliance, and ethics.
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Designing a circuit with a LM386 amplifier
I'm designing a circuit an I want to use the LM386 audio amplifier. Before designing, I'm going through the whole datasheet, I've seen that VI is from -0.4V to 0.4V :
Here is the first typical ...
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Which signal should be fed into the single ended input of the PAM8320?
I'm feeding audio from this DY-SV17F module into this PAM8320 amplifier.
The configurations I believe I can choose from are:
1: Feed either DACL or DACR from the module to the amplifier.
2: Combine ...
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How I can use light to control of amplifier?
I want to make a car that I can control by light, and I thought of using a photoresistor and a light sensor to control the amplifier to make it perform two functions.
The first function is to make the ...
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Help Building CRT Driver That Takes Composite Video Input [closed]
I've been working with old CRT TV's, and I'm able to get a dot on the screen as I know how to operate the tubes. I have been trying for days to design a functional circuit that takes composite video ...
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Which is the default state of MCU's GPIO before initialization?
I have a microcontroller that enables an IC. This IC would be enabled when a logic 0 is set in its enable input pin. So, one microcontrollers' GPIO is connected to that pin. My question is, before ...
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Analog front end for OECT sensor
I've been asked to recreate/improve the circuit from this paper. Here is an extract that describes the function of it:
"Each circuit was composed of a voltage output (Vout GD or Vout SD) ...
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What is the significance of this circuit?
It is a part of a sensor circuit on I2C lines. But why are MOSFETs being used to connect pull up resistors for I2C lines?
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Can you draw power from the ADUM4160 USB isolator
I am developing a USB powered medical device and I am thinking of using the ADUM4160 to isolate the USB from the device.
However, there is one thing i didn't understand about the device: does it ...
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Designing around multiple voltage sources for a device powered by an external supply and connected to a PC via USB (Arduino Nano)
I'm working on a device that used an Arduino Nano to operate multiple motors with a cumulative current draw of over 1A. Commands are sent from a computer via USB to operate the motors. The device is ...
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-VOUT, and COM pins for DC-DC Converter
For this DC-DC converter
it shows PINs labelled as (see image):
1.) This is from the datasheet, https://www.murata.com/-/media/webrenewal/products/power/datasheet/ust-3w.pdf one of the few that ...
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Is it okay using IRL520n without Resistor and Diode for DIY Brushed ESC/DC Motor
In this chance, I want to know further after doing some experiments related to Logical level MOSFET (IRL520N) as a speed controller for brushed 820 DC motor for micro Arduino Quadcopter.
I had done ...
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Designing a differential equation circuit with op-amps
I have the following assignment question
The differential terms all contain the output voltage in differential forms. My first thought was to then implement op-amp as integrators in each stage since ...
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Measuring voltage on an edison outlet in a hybrid vehicle
Forgive me for what may be a fairly basic question, but I'm a student and I just happened to run into this while doing a recent project.
I own a hybrid car, and in the cab is a 400w inverter with a ...
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Voltage gain of this OPA circuit with AC input
The aim is to attenuate 10 times and cutoff frequency of at least 10 MHz.
I understood that the green section of the circuit reduces the voltage gain. I have noticed that increasing the orange section'...
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Questions about a CTAT circuit
Please refer to the following CTAT circuit
source: https://wiki.analog.com/university/courses/electronics/text/chapter-14
The following notations are used:
VR1 - voltage across resistor R1
VR2 - ...
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How to turn an LED on in an inverter circuit
I am currently trying to build an inverter circuit which turns on an LED (on a simulation before building it physically). I am using an 2N3904 NPN transistor, 5V voltage sources, a 220k and a 47k ...
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Mainboard heated/reballed components - mobile phone [closed]
I recently attempted a DIY repair on my Samsung A51. I heated the motherboard in an oven, suspecting that the solder joints on the board might have been disconnected. Additionally, I replaced the PCB ...
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Latching comparator always starts at latching position
I build a over-current protection circuit using a latching comparator, below circuit diagram is the simplified version (without the current limit circuitry):
simulate this circuit – Schematic ...
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Help finding a circuit for discharging a high voltage capacitor
I am on a college project where we make F1 style cars for competitions. Ours is an electric car using a 588 V(maximum) battery to drive the motor.
The inverter has a capacitance that, by the ...
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Why is my voltage disapearing from esp32 to RJ45 connector?
I am working on a project where I am sending data from an ESP32 through an RJ45 cable to a DMX decoder. As far as I can tell my wiring is correct, however, I do not appear to be getting the signal to ...
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Improving voltage follower circuit for high voltage pulse
What I’m doing:
I have some unknown resistive loads that I want to apply an exponential decay pulse to.
Regardless of the resistance of the load, I want to be able to specify the pulse peak voltage ...
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Read multiple PT100 sensors with MAX31865
I'm building a temperature logger with four PT100 sensors. I've already decided to use a MAX31865 converter (just the IC), 3-wire PT100s and the device will be a Raspberry PI HAT - the PI will talk to ...
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Enable voltage doesn't change on LTC2950 pushbutton on/off chip
I'm troubleshooting a problem with an LTC2950 chip, specifically this version from Digikey. The LTC's enable pin is connected to the enable pins on anLMR15430 regulator configured to provide a 5V ...
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HV to ADC interface for Photodiode pulses
Reduced circuit for simplicty. LHS circuit models SPAD pulses in response to photon pulses.
My issue is that I need to acquire cathode output from HV and to condition it to ADC, say FSR=5V. I'm ...
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Safety of dual male / single female Y cords
On Amazon there are Y cords with two male plugs and a single, higher current female socket. These are advertised as providing a way to power equipment with higher current demands than a single outlet ...
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What is wrong with this circuit?
This is a circuit of a vehicle ECU. It should turn on the ECU but there are some mistakes and the ECU won't turn on but I can't figure it out:
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Can FT232HL VCCIO be powered from external source?
I would like to power the FT232HL from VBUS, but prevent it from supplying power through (UART) IOs to connected microcontroller. Microcontroller is powered from an external +3V3 source, which might ...
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Design non-inverting op-amp, with gain = 30estimate Ri, Rf and Rs from the standard 5% resistor value that will meet |AVCL| = 30 within +/-5%tolerance
I want to Design non-inverting op-amp, with gain = 30 (within +/- 5%) estimate Ri, Rf and Rs from the standard 5% resistor value that will meet |AVCL| = 30 within +/-5% tolerance. I understand how to ...
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How to connect a mini camera to four 3.5-5 inch TFT/LCD screens? [closed]
I have an ambitious project, given my limited circuitry knowledge.
To simplify my project's potential, I want:
One mini camera
Four TFT/LCD displays (anywhere between 3.5 and 5 inches)
As long as the ...
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How to setup a current controlled current source (CCCS) in the electronics workbench tool
Implement this circuit in Multisim Electronics Workbench:
Can someone validate/check if the values measured by volt/ampere-metres are correct? and tell me how to approach such problem analytically?
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What are the theoretical constraints that prevent making the propagation delay of a CMOS inverter arbitrarily small?
I'm taking a course on CMOS circuit design and, from my course slides, I have that the the low-high propagation delay of a matched CMOS inverter is given by
$$
\frac{2\,L\,{\left(C_{\textrm{DB2}} +C_W ...
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Double frequency buck converter - minimum values of smaller and larger inductances
Consider a double frequency buck converter shown below having small and large inductors operating at higher and lower switching frequencies respectively, in order to improve both the transient ...
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BJT voltage rail
I have run into some misunderstandings regarding voltage rails in circuits with components such as BJTs. And not the BJTs, but rather the conventional current model schematic made, and the real thing, ...
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I would like to know how to set up transformers in Proteus program [duplicate]
I would like to know how to set up transformers in Proteus program.
I want a transformer rated 220VAC 24 0 24.
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How to find the values with a voltmeter and ammeter?
I'd like to know how the values obtained in that image are derived.
And I would like to know how to set the transformer in Proteus. What should I set if I want to use a transformer 220 V 24 V 0 24 V ...
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VESC and wireless receiver setup
Trying a DIY VESC project, but very limited knowledge of circuit boards and connections. I have dual Maytech 100a V6 VESC and wireless receiver, but I don't know how to connect them. The remote is ...
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DIY motor project - Help needed for configuring Maytech 6374 motor
I have very elementary electrical knowledge. I need help with configuring motors. I have dual Maytech 6374 motors (150 kV, 08 A idle current, 65 A max current, 60 A rated current, max output 3550 W, ...
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Designing a self-power current range detector
I need to design a current range detector i.e. a module with an AC current as input and a digital output. When the current is within range (i.e. between 0.1A AC to 2.5A AC), the output should be a ...
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IR Jammer Circuit Diagram Confusion
I'm fairly new to electronics so please bear with me. I was looking for a new project and found a circuit diagram of a "TV Remote Jammer" online (https://shorturl.at/doGRW). This sounded ...
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Anlysis of circuit as excersice
I am trying to analyse this circuit as part of learning electronics. So far I think that this is just an DAC that goes to a non inverting opamp after the signal gets attenuated, it goes through a ...
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I want the DC voltmeter to read 25 V. How do I adjust the value in the circuit?
I want the voltmeter to read 25 V across the capacitor and zener diode. How do I modify this circuit?
What additional adjustments do I need to make?
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Using MAX7301 GPIO Expander for Raspberry Pi Switching and Chip Selecting
I'm designing a PCB that uses Analog Devices' MAX7301AAX GPIO Expander IC to expand the Raspberry PI's GPIOs.
Digikey MAX7301
The reason I'm using this IC is that my application requires a lot of ...
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How to translate from voltage in a circuit to a command on a phone? [closed]
Basically, what I am trying to accomplish is getting my phone to make a call (to a specific number, say, my brother's), when a certain voltage threshold is exceeded. However, I have no clue how have ...
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How to properly import pspice models
Some .lib models have several subcircuits, however when you export a part (.olb) you can only select one subcircuit and export. As shown in the image below, there is MAX2408, SHDN, MAX4265a, etc.
As ...
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Buck Converter Output Voltage Swing problem
I am designing a voltage mode control buck converter and I have an issue with my output voltage swing. I made calculations for type 2 compansator. I can't figure the cause of problem is stability of ...
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DC/DC split rail converter like TI's Fly-Buck™ coupled inductor topology but with a non-inverting buck converter
Introduction
First of all, I hope you can read this through. It's rather long!
I was trying to design a DC/DC converter for a Class-D amplifier that requires a 48V input and also an auxiliary 12V ...
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Low Battery Detection Circuit
I'm trying to light up an LED when my li-po battery level drops below 3 V. I have been using the scheme you can see in the picture.
The only change I have made has been to adjust the values of the ...
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Circuit design for switching between two low voltage AC loads
I've been trying to figure out this circuit for hours and I'm stuck! I have got a working version but it requires 10 switches to be toggled and I need this to be cut down to 2 switches - I think it ...
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Driving a 12V ~500mA load with a 3.3V logic level special pin GPIO0 on a ESP07s and ULN2003
As some of you know GPIO0 is a special pin that needs to be pulled HIGH during start-up else the ESP07s enters flash mode.
Questions:
The pull-up to 3.3V works right? My thinking is that if I have ...
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How to interpret the equivalent circuit of a true bipolar SAR ADC?
I am referring to ADS8548 (Datasheet).
How do I interpret this equivalent circuit of the input of the ADC?
CH_XX would be where the analog voltage is fed and AGND ...
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