Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [analog]

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

1
vote
0answers
42 views

Arduino - Using NPN transistor as a switch to pull-up/down analog pin

I am new to this site. Usually, I find what I need by searching through... but not this time. I am sure most of you will answer this question in your sleep. I am building a capacitive sensor using an ...
1
vote
0answers
22 views

Sampling DC and AC components of capacitive sensor

I'm using a MEMS capacitive pressure sensor SCB10H. As I understand it, I can wire it up in one of two ways. Either I can measure the absolute capacitance using a chip like the TI FDC1004. In this ...
1
vote
1answer
64 views

Floating analog input using Arduino with 1m cable

I use an analog input from an Arduino to read the value from a piezo plugged in parallel with a 1M ohm resistor. I followed this tutorial from Arduino: https://www.arduino.cc/en/Tutorial/Knock Here ...
3
votes
1answer
64 views

Designing 4th order Butterworth Multiple feedback bandpass filter

I'm trying to design a 4th order Butterworth bandpass filter using Multiple feedback topology. The design requirements I am trying to achieve for this filter are; Q factor = 10, Av = 11, fc = 100kHz ,...
1
vote
3answers
71 views

How to obtain Input voltage from ADC value

I am using atmega328p for my project. I have to read my battery voltage and display it in my cloud. For that, i am using ADC. Now I am getting the ADC value for input voltage applied. But i need to ...
1
vote
1answer
59 views

Explanation of 3 Tone Control Circuit

I'm building an analog drum machine and want to have a 3 tone control circuit to individually adjust the bass, midtones, and treble frequencies on each of my instrument channels. I thought it would ...
0
votes
1answer
49 views

Splitting an Analog Signal Without Adding Noise

I am trying to take a current measurement, run it into a PCB that splits the signal, and then output the signal in two places. One of the destinations is a RIO being used for feedback control, the ...
0
votes
0answers
19 views

What are the best (preferably modern) books on music applications of software and electronics? [closed]

I've been looking to learn some music on my own. As a computer engineering student I'm interested in combining my field with this interest and going over an engineering book focused on musical ...
1
vote
0answers
62 views

Overvoltage protection circuitry choice

I need to design a input overvoltage protection for a 45W DC-DC converter rated for a 9-24V wall wart input (so, 45W / 9V = 5A input current at max). So far I've seen two approaches (schematics below):...
3
votes
1answer
84 views

High-side vs low-side reverse polarity protection

I need to make a reverse polarity and over-voltage protection for a fairly powerful device (45W @ 12V input) and after some research I noticed a weird peculiarity. A typical reverse polarity ...
0
votes
0answers
34 views

Analog Switches for decoupled Signal

I am currently working on a small board just for learning about PCB-Design and some analog stuff. Hence, I am pretty much a noob in this domain. I want to measure the impedance of a device, however ...
-1
votes
1answer
51 views

How do you connect a device pin AIo when there is only AI0+ and AI0-

I am new to electronics and I faced this problem. I tried to search about it but got lost. Here is the sensor and the DAQ device https://docs-emea.rs-online.com/webdocs/13ec/0900766b813ecfc2.pdf ...
0
votes
1answer
27 views

What is the reference for High side IC with internal mosfet driver

In the schematic below (like many other) the IC (switcher) is on the high side. I was really curious how the internal circuitry of such an IC is referenced to. My first thought was that everything ...
3
votes
1answer
108 views

Reducing effect of MOSFET parasitic capacitance with resistor in series with gate

I have a MOSFET in series with the output of my amplifier to switch the amplifier output to the downstream circuitry. The MOSFET parasitic capacitance is seen as a load capacitance by my amplifier, ...
3
votes
1answer
88 views

5V (analog) to 3.3V (analog) for current measuring

I want to use an ACS723 current sensor and I would like to transform that signal into digital using the integrated ADC inside a ESP8266 (Wemos D1 mini). I'm not sure how can I do that. I think maybe ...
-2
votes
2answers
67 views

Gain of a feedback amplifier with base to collector resistor [closed]

I'm able to solve this problem using the concept of Miller resisitance however I'm having an issue solving this problem using the concept of feedback amplifiers. Can someone help me solve this problem ...
1
vote
2answers
36 views

How do the areas of the emitter, base and collector affect their respective currents?

I want to know what will be the effect on current if we change(increase or decrease) the area of the emitter, base, and collector. For example, if we double the emitter area what will be the effect on ...
0
votes
2answers
67 views

Wien bridge slowly decaying oscillator

I want to build a resonator that slowly (~3 seconds) decays without a stable oscillation. I've tried using a simple RLC circuit without luck - I've got ~1-2ms decay time at maximum; so, I've turned my ...
0
votes
1answer
34 views

Trigger an analog SPDT switch ONLY with a long button press

I'm currently working on project where I need an analog SPDT switch to be only triggered by a long button press. Long story short I'm trying to make a module that would fit inside a Game Boy. This ...
0
votes
0answers
47 views

What is the transfer function of the given opamp circuit?

Now, \$ v_2=\frac{(R/2)}{R/2+X_C}*0=0 \$ \$ v_o=0 \$ What have I done wrong?
0
votes
1answer
29 views

NMOS/PMOS Characterization

I have some questions regarding NMOS/PMOS characterization. I'm designing a common source amplifier using gm/Id method and since it requires characterization, I did so but using minimum lengths and ...
2
votes
1answer
166 views

Calculating the entropy rate of ADCs

Formally, the entropy of a normal distribution is:- $$ \frac{1}{2} \log(2 \pi e \sigma^2) $$ So if you're sampling a random (normally distributed) signal, that would seem to be the rate of entropy ...
1
vote
0answers
24 views

phoresistor vactrol tremolo noise

I made an optocoupler by shrink tubing a generic photo resistor and a cold white led. Then used it in the following setup to be able to control audio level to achieve tremolo effect: simulate this ...
0
votes
1answer
18 views
3
votes
1answer
61 views

Microcontroller PWM output volume

So I am designing a cheap and simple sound device using the Atmega32U4 uC and stumbled across one problem. I am using the 10-bit PWM output of the uC to output audio and I want the user to be able to ...
1
vote
1answer
50 views

LC Resonance circuit : output voltage

What I understand(FACTS) : In for example a LC resonance circuit the output can many times greater than the input voltage. At resonance the impedance of the inductor is the same as the impedance of ...
2
votes
1answer
57 views

Zero-crossing in AC with DC offset signal

Introduction I have a project about measuring the voltage, current and power factor of an electrical system. I had designed a system that allows the microcontroller to measure the peak of an AC with ...
0
votes
1answer
34 views

Analog logic circuit with adjustable threshold

I have a logic circuit currently consisting a few few AND gates and it's working fine (simulating) with if i use logic levels as the inputs. However my input levels might change in amplitude and I'd ...
0
votes
1answer
35 views

Why does DAC INL follow a pattern, with peaks repeating at certain specific intervals?

INL curves seem to have relation with "digital" effects from the codes,like a major carry transition. Could someone help me understand an electrical or rather an analog, explanation for this occurance....
0
votes
1answer
28 views

Removing/Subtracting Lead Resistance Using Op Amp Circuit

I'm working with RTD sensor, and need to use Op Amp circuitry. Can someone explain to me how this Op Amp circuit work to remove the lead resistance? So that Rw1, Rw2, and Rw3 vanish, hence the ...
1
vote
1answer
65 views

How can I determine a resolution of 4:2:2 YCbCr image?

I fetch data from 420 TVL camera, and now I just want to see this image, the only thing I need is resolution to draw it on my screen. How can I determine this? BWP M420MD -- camera, I'm getting DCMI ...
0
votes
1answer
44 views

Achieve -12~12V PWM Signal isolate

I have used IL300 to isolate 0~5V PWM signal before and it works great. The circuit is shown below. But now I need to isolate -12 ~ +12V PWM signal. Is there any possibility or suggested circuit to ...
0
votes
0answers
28 views

PMOS as a pass gate in SRAM

Can anyone explain why replacing the NMOS pass gate in SRAMs with PMOS would be a bad idea from a circuit perspective? Fast responses would be appreciated. Thank you!
0
votes
1answer
119 views

How are PWM IC's able to provide so many features in small footprints ? [closed]

If you look at the general pwm IC's for standard topologies (buck, boost etch) , they have tons of protection features such UVLO, overvoltage, cycle-cycle protection and overcurrent protection. They ...
1
vote
1answer
27 views
1
vote
1answer
61 views

Calculating drain current with series N-channel MOSFETs

When two N-channel MOSFETS are connected in series, with common gate connections, then how can I analyze this circuit to determine Id through these MOSFETS, as a function of Vgs and Vds? simulate ...
0
votes
1answer
26 views

Problem with Vout of Honeywell ASDX Analog pressure sensor

Few months ago I decide to bought an absolute pressure measure system using a Honeywell ASDX differential analog pressure sensor (Model: ASDX ACX 030PAAA5). The datasheet of this type of sensor ...
0
votes
1answer
50 views

How would I go about measuring an analog signal that has both positive and negative voltages on an arduino analog pin at a high sampling rate?

I have a signal that fluctuates between -70mV and 50mV. How would I get the arduino mega to read this on an analog pin at a high sampling rate? Ultimately I am trying to graph the data in real time so ...
1
vote
0answers
57 views

Problem with signal edge in schematics containing high speed IC switch

I am trying to design the following schematics: There are two kOhms resistance which are connected serially. One is load and another is device resistance. I need to apply the voltage in a the ...
1
vote
0answers
65 views

Make a double-tapping button (ideally without ICs or keeping ICs to a minimum) for a small “tiny cell” powered device

Conditions: small device, extremely space constrained (large caps are a no-go) Powered by a small battery (something like under 120 mah) Thus, adding a few more ICs like the 555 or "TimeBlox ...
0
votes
2answers
81 views

Why are my op-amp (LMC6484) output signals not independent of each other?

I am using a quad op-amp (LMC6484) in a non-inverting circuit. Using only one of the 4 op-amps I was able to amplify Vin = 80.3 mV to Vout =1470 mV. Rin=2.66k Rf=10k. V+= 9V… V- = -9V My problem is ...
0
votes
1answer
37 views

Simulating 3 phase mosfet bridge with LEDs

I have a commercial 3 phase BLDC motor driver board (TI DRV8323 BoostXL) and I want to write a firmware from scratch. For testing, I want to make sure I open/close the mosfets in correct order. I am ...
1
vote
2answers
88 views

Why are binary signals drawn continuous in time despite being a digital signal [closed]

The conventional definiton of a Digital signal is as follows: A digital signal is a signal that is discrete in time and quantized in amplitude. Almost all resources (textbooks, online sources,etc) ...
0
votes
1answer
42 views

In ADCs, what is the number of conversions per sequence?

I'm dealing with a microcontroller's Analog to Digital Converter (ATD_10B8C) that has a control register who's bit values determine the "number of conversions per sequence". What exactly does this ...
1
vote
3answers
65 views

Shield grounding for analog sensor

I have an analog sensor, a resistance temperature thermometer, which is essentially just a resistor (~50 Ω) which I apply a constant current to (10 mA) and measure the voltage of in order to ...
2
votes
0answers
56 views

Noise immunity of single ended analog voltage signal

I want to use a sensor with analog output in my design. The output of the sensor is a low frequency traingular wave (less than 300 Hz) and voltage vetween 0 - 5V. I need to carry the sensor signal to ...
0
votes
1answer
48 views

Is there an analog circuit or filter that can produce constant phase shift over a specific bandwidth?

I need to match the phase of two signals coming from a pair of transducers over the 10Hz to 4 KHz range, the difference between the two transducers is really close, however one of the transducer lags ...
1
vote
1answer
72 views

Simple analog circuit to simulate acceleration and braking behaviour in scale models

Background Scale-model road systems such as Faller https://www.faller.de utilise vehicles that follow a ferromagnetic wire embedded in the road surface. The vehicles operate at full speed and continue ...
0
votes
2answers
79 views

STM32 -ADC ERROR

I have make an STM32F030F4P6 board for reading analog values. When I connect the analog pin to vcc the value is 4095, instead when I connect the analog pin to GND the value isn't 0. How can I solve ...
0
votes
1answer
21 views

LTC1668 - COMP1 & COMP2

The LTC1668 is a 16-bit, 50Msps differential current output DAC. The datasheet say that the COMP1 pin and COMP2 pin should be bypassed to VSS (-5V) with 0.1µF. COMP1 is for Current Source Control ...