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Questions tagged [analog]

Analog circuits have a range of voltages, rather than just two as in digital logic.

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23 views

Resources for learning about transistor configurations?

I'm currently taking a circuits class that discusses various transistor amplifier configurations eventually culminating in building an op-amp. This includes various configurations such as the ...
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0answers
14 views

Interfacing CV2.Videocapture function with analog signals?

I have an analog (PAL) type camera. Camera works at 25 fps with 720 X 576 image resolution. I wanted to read the frames using OPENCV - PYTHON and wanted to do some deep learning stuffs. But since the ...
4
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4answers
94 views

Sampling Theorem and reconstruction

I do not understand a concept about the Nyquist - Shannon sampling theorem. It says that it is possibile to perfectly get the original analog signal from the signal obtained by sampling if and only ...
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0answers
47 views

Delay In circuit

I am working on a mini project using op amp.The circuit uses comparator so when a resistance is changed i.e the Vin is changed(cause I am using Resisters Voltage divider )comparator gives output and ...
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1answer
22 views

Using internal regulator DVDD pin to power up external devices

I am designing a H-Bridge PCB and using DRV8323 as the driver. This chip has a pin name DVDD which from my understanding, from the below statement, is used to ...
0
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1answer
56 views

Resistive Divider

In a nutshell, the book says However, I don't see how that's true. If I re-draw that resistive sensing part as follows: Surely, isn't it just Why do I have a minus instead of a +? EDIT: I just ...
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0answers
31 views

Analog Input Measuring Method [on hold]

I have a question about wiring analog input and measuring method. It seems to me; 2 and 3 wire current analog input wiring is single ended measuring and is going to an amplifier in module that is ...
0
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1answer
57 views

Class D Amp headphones grounding circuit

I am having a problem with some of the class d amps I've played with (PAM8302A), and it seems like this article here describes my problem: https://www.edn.com/design/analog/4313726/Add-headphones-to-...
6
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1answer
73 views

Best layer stack strategy for a 6 layer PCB with mostly SMD components

I am doing a design in a 6 layer PCB where both sides are populated. 95% of the components are SMD. The design is not "High Frequency" in terms of signal speeds....the fastest thing here is a MCU with ...
3
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1answer
53 views

Having different voltage potentials as power planes on the same inner layer of a PCB

I am working on a 6 layer job which placement of the given components in the rather limited area that I have to work with...is driving me a bit crazy. I have no option but to have 2 different voltage ...
1
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1answer
58 views

How to Amplify Thermocouples (and DC sensors between 1mV and 1µV DC)?

This is a bad idea, I know Here's what I know about amplifying really tiny DC voltages: it's impractical to build your own for production there's going to be noise the signal is relative to the cold ...
5
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1answer
111 views

Connecting top and bottom SMD component pads using via

I am working on a 2 layer board and the PCB will be a double sided job. Some components on the top layer will have exact mirrors on the bottom right under them. My question is, for SMD components, can ...
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3answers
145 views

Reading 32 ADC channels

I have been working on an application which must read 32 analog channels at least 200kS per second. 0 to +3.3V 12 bit resolution 1% accuracy I've come up with 2 potential solutions: 32 ADC ...
2
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0answers
79 views

PWM to synth control voltage improvements

Just built this little circuit to control my Moog Werkstatt. The plan is to make a MIDI-to-CV converter and add more CV outputs and of course a GATE output later. But before going further, I thought I'...
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1answer
34 views

Energia/MSP-EXP432 Issue: Analog In Pin removing voltage from Voltage Divider

In the circuit below, I want to measure the voltage going to the ADC (output from the voltage divider consisting of a fixed resistor and photoresistor) using an MSP-EXP432; however, the MSP-EXP432 "...
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0answers
34 views

Reading Digital and Analog Signal from Different Sources with Arduino

I am using an Arduino to read signals from 2 different devices. (This is an automotive project so all 3 are powered by the 12v battery of the car). The signal from one of the devices is a digital ...
0
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1answer
51 views

MSP-EXP432 “Analog In” pin taking voltage from circuit [duplicate]

I am building a circuit consisting of a voltage divider (with a fixed resistor and a LDR or photoresistor) outputting voltage to an ADC. I want to measure the voltage going to the ADC using an MSP-...
0
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1answer
36 views

Produce and amplify analog signal with microcontroller (For PLC)

Overview I need to create an analog voltage of 0V-10V for the PLC with a microcontroller with operating voltage 5V. Approach I've been doing this research since last week. I'll share the results of ...
2
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1answer
151 views

Analog Mute Circuit - Simplest Solution

I'm building a simple analog mute circuit and I need advice on the simplest way to achieve my goal. I have a GPIO pin that goes high when audio is playing and low when it's not. When audio is not ...
0
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0answers
51 views

phase shift in LRC circuit

I need to use a L-R-C tank in my design and I'm having trouble with the calculations. And I think it is because of the phase shift I didn't take into account. Here you can see there is a differential ...
0
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2answers
77 views

Analog sensor nonlinearity near the rails

I am looking into a 0-5V analog sensor. The problem with this sensor is that it will typically swing within 15 millivolts of the power supply rails with no output load. (datasheet p. 4) This ...
0
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0answers
28 views

How to detect source presence using LTC4412?

I'm using 2 power sources as shown in below picture. The status pin is suggested to pull HIGH to VCC(which can be the adapter input). As mentioned that Status pin OUTPUT is LOW when Wall adapter ...
0
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2answers
57 views

Differential amplifier with feedback resistor

In this circuit, if a resistor of 1 M\$\Omega\$ is connected between A and B, what is the effect on the stability of the quiescent point? The analysis I made led me to believe it would provide ...
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2answers
55 views

Analog signal exchange between microcontroller and PLC

Overview I need to create an analog voltage of 0V-24V for the PLC ( s7-1200) with a microcontroller with operating voltage 5V. Approach I've been doing this research since yesterday. I'll share ...
4
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1answer
135 views

PCB design review: analog routing

I am designing a PCB with analog signals for the first time, and I would really appreciate any feedback on my layout and routing. The circuit is a light-meter, consisting of a photodiode connected ...
1
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1answer
32 views

Is this opto input current sized wrong and can it have such symptoms?

I have been using 4N26 opto for some time for a trigger input of a module. Vin is fixed 40Hz 0..5V pulse with %50 duty cycle. OUT goes to trigger of a module. Below is the schematics: Among ...
0
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1answer
95 views

how does single supply op-amp work while its non-inverting input is connected to ground?

In HCNR200 Datasheet, the page 11, figure 13-A, there is a sample that confused me. In this sample, the Vin is applied to the inverting input and if the electric current passes through PD1, PD1 ...
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1answer
63 views

Questions about grounding points for an analog signal transmission

I'm planning to implement the following circuit I have drawn. But because there is no SPICE for such components I couldn't verify or test any overall workings. From left to right I will first ...
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0answers
46 views

Does potentiometer accuracy change with degree of movement?

I want to use a conductive plastic potentiometer for my actuator application where movement is +/- 40 degrees. As in datasheet, the potentiometer linearity is given as +/-0.2 % which I think is for ...
1
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3answers
65 views

How to combine a LPF and a Voltage divider?

I have to connect a 5V analog signal to a 3.3V MCU analog GPIO input as shown in the attached image. I wonder if its possible to combine the 2 blocks of voltage divider and RC-LPF into a single block? ...
0
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2answers
56 views

Analogue signal generation: Which is better Standalone or PWM DAC?

Most controller/processor come with PWM output and integrated standalone DAC module.... My need is to generate 50/60Hz analog signal for testing purpose! Which would be the good choice PWM DAC or ...
0
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1answer
68 views

5V Current Transducer to 3.3V Analog GPIO Input

I am trying to find 3.3V variant of the 5V Current Transducer LTS_25-NP but so far no success. Is it possible to interface this 5V analog output to 3.3V STM32F407 analog input GPIOs? Edit: I want to ...
0
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0answers
58 views

Voltage controlled amplitude problem - JFET circuit

I work on a function generator project. It generates waveforms such as sine, triangle, rectangle with PWM regulation, saw. I would like to digitally adjust the signal output amplitude. Input signals ...
2
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0answers
66 views

High SNR FM demodulation

So I need to demodulate the FM signal from a sensor with highest SNR possible, at least 70-75 dB. IF is 10.7 MHz, max. deviation is 200 kHz but I can change those values if needed. Baseband signal ...
2
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0answers
49 views

How does the biasing work in a JFET based triangle to sinewave converter?

To those who haven't see this cool little circuit it employs the non-linearity and symmetry of the JEFET to clip a triangular signal to make it more sinusoidal Can someone please explain to me how ...
0
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3answers
59 views

Why my HB100's amplifying circuit can't generate more than a signal of 200 Hz?

I want to amplify the HB100's IF signal with the circuit shown below, but when I test my circuit I can't read more than 200 Hz, maximum 300 Hz. The circuit works with the OPA2365 integrated circuit at ...
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2answers
102 views

Ground, common, and Earth ground confusion

I am learning on transmitters and input modules nowadays. But the usage of word 'ground' is confusing me. What does 'ground' mean there (earth or power supply common)? If it is earth ground, why we ...
0
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2answers
124 views

What is the purpose of these diodes in this opto isolator circuit?

I came across this circuit which I think is to isolate a high voltage signal to a safe level for GPIO of a 3.3V micro controller. My question is that how on earth this circuit works...There are 2 ...
0
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1answer
51 views

PWM to analog RC based filter with minimum analog voltage level

I am trying to design a circuit to accomplish the following: 1) 5 V PWM signal is converted to 0 - 2.5 V analog voltage 2) The analog voltage should never drop below a certain minimum voltage level ...
0
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2answers
83 views

How can I make a phase shift in an audio signal without changing the frequency response too much?

I have the following problem: I have two amplifiers, one is a mono amp for a subwoofer and the other is a stereo amp for two two-way speaker enclosures. The subwoofer and two-way enclosures have a ...
1
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1answer
54 views

Characterization of an Amplification/ADC circuit

I build a small amplification circuit in order to amplify the low voltage signals of my passive sensors (the sensors have a source impedance of about 50-200 Ohm and they output a low voltage signal in ...
1
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2answers
89 views

Several Questions About Analog Input

I am new in the automation industry, and now I am focusing on learning how to wire correctly analog inputs in detail, since last time I tried I damaged the module input because of wrong wiring. Here ...
2
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4answers
473 views

Converting ADC output to real values [closed]

On a custom board I have an ADC which measures -5V to +5V. And outputs in Hex via SPI like this: ...
0
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2answers
76 views

In an AC coupled Op-Amp circuit where do input bias currents flow from?

If we have an AC coupled amplifier like the one below, i've read and been told it needs a DC path to ground to allow input bias currents to flow, though I just can't get my head around this, I bias is ...
3
votes
3answers
411 views

Difference between analog signal and battery voltage

I want to find out if using an analogue sensor is feasible in my noisy environment by running some signal integrity tests before I buy it. Because I don`t have the sensor yet, I need to simulate its ...
0
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0answers
34 views

HELP with analog input and PWM output

I am new to the forum and I have a very basic knowledge of electronics. I am trying to use a ready made bluetooth controller that comes with an app and generates a pwm signals. Then use that signals ...
0
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1answer
71 views

Starting point for DC/AC-inverter

What I have: 5VDC and / or 12VDC, a PIC micro What I want: Floating 9VAC 50Hz, able to output 1A. Googling details for this kind of inverter seemed to be a tricky case. There are a few DIY-pages ...
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1answer
52 views

Working of NMOS as a capacitor

I came across instances where NMOS was used as a capacitor in analog circuits. This is done by shorting the drain and source. The drain/source acts as one terminal of the capacitor while gate acts as ...
3
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1answer
120 views

Analogue (or digital) signal integrity with multiple sources of noise

tldr: Can I transmit an analog signal through a noisy environment without it being corrupted, or should I use a digital signal instead? My requirement is to transmit a signal from a MA3 absolute ...
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3answers
109 views

Is there any way to obtain linear or angular distance proportional to a voltage signal?

If we have a programmable arbitrary function generator as a voltage signal source and if we are able to output any waveform like a sine or exponential decay as output voltage versus time; how can this ...