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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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1answer
60 views

Transmitting audio signal over long wire

If audio signal needs to be transmitted over long wire say 50 meter length (and needs to be heard through a speaker at other end) , what parameters needs to be taken care of? If we send signal over ...
0
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0answers
39 views

Analog power question

This is a homework question but i would like some assistance in this. Thanks. An A/D converter with a sampling frequency of 100 Hz is used to digitize an input analog signal in a video game ...
5
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2answers
506 views

Is it safe to make a dual supply out of two wall adapters?

I am trying to design a guitar distortion pedal circuit and I need +9 / -9 V dual supply in my application. I have two 9 V adapters: https://www.phihong.com/assets/pdf/PSM03A-XXX.pdf Would ...
0
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1answer
18 views

LTC1966 Sallen-Key post-filtering application question

Just a quick question about an application circuit in the LTC1966 datasheet. Figure 13 on page 18 shows a third order (when considering output resistance of the LTC1966) Sallen-Key filter, with a ...
0
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0answers
50 views

Audio power amplifier circuit explaination

This circuit: My goal is to modify this circuit to operate in DC mode. Got this circuit on the web, but there is some part of it that I still don't get how it operates. T4/T5 is an adjustable ...
0
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3answers
48 views

Negative Voltage Shift from Blocking Cap for Amplifier

Recently I have been working with the Analog Devices AD797 op-amp in LTspice, and have been getting poor performance from the amplifier when using a low-amplitude signal. This is my circuit in LTspice:...
0
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2answers
40 views

Closed current loop control without H-Bridge, PWM

I am trying to find a way how to control the Voice Coil Motor (VCM) or PMSM motor with a closed current loop without the use of an H-Bridge & PWM. Does anyone know how to make an analog closed ...
1
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1answer
97 views

USB shield for analog and digital ground?

I'm new to Mixed-signal design and I'm having trouble deciding how to connect my digital and analog ground. I'm doing a 4 layer design, so I have a split ground plane. As I understand, since I'm ...
0
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1answer
38 views

What matters, the rms or peak value of the Analog signal to choose appropriate ADC for digitization?

i have an 23 bit ADC with voltage reference of 1.4 V. If my input Analog signal is AC with frequency 50 HZ and its rms ranges from 0.2 Vrms to 1.3 Vrms. Then its peak voltages will vary from 0.28 V to ...
13
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7answers
4k views

Is it possible to send multiple data bits on a single wire at once?

Is there an existing protocol or modulation method where multiple data bits are sent over a single wire at once or maybe an additional ground line (like serial communication)? I know there are ...
0
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2answers
74 views

How can I convert a pulsed signal to an analog voltage?

I would like to measure the speed of a DC motor using a phototransistor and get as an output a voltage which varies linearly with frequency. The motor speed can vary from 0 to say 3000 RPM. Using the ...
1
vote
2answers
60 views

Analog Bistable Memory

I am looking for a device which I do not know exists. I would like to store the state of a number of analog switches, perhaps driven by a D Type Flip Flop. I'd like to drive the flip flop and set ...
0
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1answer
27 views

Protecting voltage sources against pushing or shorting into each other

I am designing a PCB where there is a load with peak power of 15 Watts to be powered from a user selectable voltage source. There are a 35V and a 24V sources and it should be only one of the voltage ...
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0answers
29 views

ENOB vs Effective Resolution [duplicate]

Please explain the difference between ENOB and Effective Resolution. I read that ENOB is used when we measure an AC quantity using ADC and Effective Resolution is used when measuring a DC quantity (...
1
vote
1answer
44 views

Measuring input voltage with 3.3V ADC MCU

I am designing my very first DC motor driver circuit. Right at the start, I want to be able to measure the input voltage to the system. The system supposed to work with external DC power supply from ...
2
votes
2answers
105 views

Old-school pseudorandom pulse generator (requesting assistance with hardware design)

I would like to design an old-school pseudorandom pulse generator to trigger various types of events (hardware suggestions only please - no programmable ICs). The events that I want to control need to ...
0
votes
2answers
59 views

A low power circuit to measure large resistances

I am trying to measure resistances in the range 20 kohm to 1 Mohm. Initially, I was using a constant voltage source, but the power consumption when the R = 1 Mohm is very large. I want to use as ...
0
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2answers
34 views

Should analogue multivibrator and comparator pullup circuit have separate supplies?

I have managed to produce a design within the falstad circuit simulator for an analogue "LED chaser" using an analogue multivibrator and 3 comparators inspecting the voltage of one side of the ...
1
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1answer
58 views

Dealing with coupling of PWM noise into Hall-Sensors as spikes in BLDC driver circuit

I have designed the first revision of a BLDC driver board (based on STM32 and DRV8323 chips). Right out of the bath (after writing the firmware of course) I noticed that the coupling of PWM into the ...
0
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3answers
84 views

48VAC analog waveform [closed]

I want to make a circuit to drive out a 48VAC 10mA 60Hz sine wave signal. I was thinking that I could generate a waveform with a microcontroller to feed it to an opamp then to a audio transformer ...
0
votes
1answer
48 views

Negative Voltage Generator for Low Voltage ( +1V ) Input

I am working on an analog circuit. I can only use a +1V power supply. My design requires a negative rail, so that my level shifter will work. Attempts: I have already seen Build Your Own Negative ...
2
votes
1answer
80 views

Programmable Electronic Load Design

I am trying to design a programmable electronic load for testing the PWM outputs of PLC controllers. The outputs operate between 5-36 V and 10-2000 Hz frequency. The output is supposed to tested for ...
0
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1answer
17 views

Why does Channel Length Modulation Increase with Higher Vgs

I'm curious as to the physical reason as to why the effect of channel length modulation in an N-MOS actually increases when the Vgs voltage is increased? See the plot below: For a long channel ...
1
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1answer
27 views

DAC negative bias reference voltage

I'm using TI's 18-bit DAC9881 and need the output to go a little below 0Volts in order to account for offset voltages of following Op-Amp stages. The DAC allows to provide a "low reference" between -...
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3answers
94 views

How can a forward biased diode be off?

Give that Vx is 3v.Diode cuttoff V=0.7V.It is said that that the diode is in off state for a specific value of R1 and R2.What is the criteria for R1 and R2 such that the diode remains off?
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1answer
136 views

Analog Computer Wiring

I'm trying to implement the following schematic of a simple analog computer The inputs are x and y, according to the text where I found this diagram the circles represent voltage dividers or ...
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0answers
72 views

Removing DC from signal

I am using the MAX30102 sensor to calculate blood oxygen concentration and I am trying to understand an algorithm I found. Some background on SpO2:https://www.nxp.com/docs/en/application-note/AN4327....
0
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2answers
31 views

RGB LED common cathode with 3.3V GPIO +single transistor

You can control a RGB common anode like this with only one transistor and 3.3V GPIO sources: How can you do this with a common cathode LED array using only one transistor per LED and 3.3V GPIOs? The ...
0
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0answers
30 views

Beaglebone bad analog input channels

I am working with a group at Mote Marine Lab which is using the Beaglebone to control a specialized marine sensor. We are using several of the analog inputs and while things have generally worked well,...
0
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2answers
80 views

Adding large numbers in context of analog computing?

I have been reading about analog computing yet have not been able to find material about a certain issue; in reference to arithmetic, it is said that op-amps are used to perform these tasks, for ...
0
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0answers
27 views

Using a comparator in tinkerCAD circuits

For anyone familiar with the TinkerCAD circuit design tool I am trying to create a simple circuit for an 'LED chaser' pattern (this is what I have seen it called elsewhere). In order to create this ...
6
votes
1answer
591 views

Making a Hall effect sensor into a PCB

This question is related to Is it possible to “trace” a hall effect sensor on a PCB?. As far as I understand it, a Hall effect sensor consists of a metal plate, plus a current source and an amplifier....
0
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1answer
26 views

Sense Connector Presence On BMS

I have a bit of a challenge and was hoping to get some ideas. I have a BMS board that is connected to some batteries, and part of that BMS has an MCU. There are two connectors in the design, a data ...
2
votes
2answers
69 views

Choosing correct DAC: DNL and INL

let me know what I state below is correct or not. Regarding the DNL and INL of a DAC, DNL is the error difference between actual step width and ideal value (1 LSB). INL is the deviation of actual ...
1
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1answer
61 views

Simple audio equalizer design: One filter is sending all the other signals to ground

I’m designing and building an audio equalizer with active frequency filters for my school project and I thought the base design was completely functional until I decided to simulate it on Proteus VSM. ...
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0answers
22 views

Transfer function of the next amplifier circuit

simulate this circuit – Schematic created using CircuitLab Hi everybody! I hope you can help me with this problem. Having the following circuit, the transfer function must be calculated. By ...
0
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0answers
52 views

Deboo integrator Query

I am trying to integrate a signal, to find out the area under curve in a particular time interval. However, I need to use unipolar sources and cannot use a normal inverting integrator. Hence, I am ...
0
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2answers
36 views

Negative Voltage Reference for Bipolar ADC

I am considering using ADS1258 - a bipolar ADC. It needs an external reference across REFP(+) and REFN(-). How do I generate precise -2.5V assuming I have +12V and -12V analog voltage rails? I can ...
0
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3answers
128 views

Area under curve within a particular time window

I am trying to make an analog circuit which would measure the area under the curve of a periodic signal within a certain time window (say, t2 and t3 in the image). I expect different voltages(say 50-...
0
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2answers
69 views

analog ground and digital ground question

I'm designing a CCD control circuit and have some questions. 1.Should the ground in the 1st and 2nd position in the oval be analog ground or digital ground? 2.If they should be the DGND, whether ...
0
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0answers
21 views

Lag/Lead Compensation in CMFB for LVDS Driver

The question is regarding using the Lead/Lag compensation (RC circuit) in an LVDS Driver. In the circuit given in the picture, I have considered the Bond pad load to be the dominant pole. But now ...
4
votes
2answers
578 views

How does a cross-over BJT's damp the distortion with help of negative resistive feedback in an analog audio amplifier?

I found an expression that explains how a circuit with op-amp responses to a distortion: $$y = \frac{1}{\beta}x + \frac{\delta}{A\beta} $$ Now consider the circuit: Here, the green, blue and red ...
0
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1answer
43 views

High Side Driver IC - Application Information

I have a question regarding VN5025AJ-E: High side driver IC. Datasheet link - https://www.st.com/resource/en/datasheet/vn5025aj-e.pdf In the figure you can see the application schematic. In the ...
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votes
1answer
100 views

Why does my amplifier turn sine waves into square waves? [closed]

All photos, schematics and the ltspice simulation file are in the folder. https://drive.google.com/folderview?id=1N1yKGnoWQoaGsuHla0DwJwF36_21ZBgX Hello! I have made a simple class A amplifier, but ...
6
votes
3answers
371 views

Floating voltage-controlled resistor with LM13700: How does it work?

1. The LM13700 The LM13700 is an Operational Transconductance Amplifier (https://en.wikipedia.org/wiki/Operational_transconductance_amplifier) converting a differential voltage into a current output. ...
0
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3answers
109 views

Interfacing with Transistors

I was reading the chapter of The Art of Electronics about bipolar transistors (chapter 2), and I came across this paragraph: But why should I use transistors, specifically, for interfacing? Why not ...
0
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2answers
128 views

Building a DIY Oscillocope

I have decided that I would like to design a DIY DSO Oscilloscope, the idea has been in my mind for a while, I just haven't had the time to look into it, I am surprised as there doesn't seem to be ...
1
vote
2answers
76 views

Absolute value circuit around a non-zero value

I have searched for a few hours on the internet and in some circuit design books, but have been thusfar unable to find a circuit that produces absolute value around a number other than zero. Does ...
0
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1answer
92 views

How to calculate Gas sensor PPM from analog readings?

I am new to Arduino and electronics in general.I am working on MQ 7 Gas sensor to test Carbon monoxide level. But the issue is i still can't grasp the concept of converting analog readings to PPM. I ...
9
votes
2answers
549 views

Identifying an old RF circuit

I got an old RF circuit (I guess), probably used for pedagogical purposes. Here's the schematic: I chose the positive and ground rails as it seems right to me, looking at transistors and resistor ...