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

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help related to frequency of schmitt oscillator

I have seen the CMOS Schmitt waveform generator circuit (i.e. figure 2nd) from the following link http://www.electronics-tutorials.ws/waveforms/generators.html I tried to simulate the circuit in ...
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2answers
94 views

How to switch between two analog outputs with a digital output?

I have a circuit with a 74ls93 counter and I want to use one of its outputs to switch between two analog output, i.e., when the output of the counter is HIGH, the output of the circuit must be V1 and ...
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65 views

What is wrong with my guitar amp?

I found this 1W guitar amp design on the Internet: http://www.diale.org/punch.html And I am trying to build it on the protoboard. I could not find the IC TDA7052, instead I've got the a TDA7052B. ...
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1answer
28 views

Gain of a differential amplifier in PSpice

I am modelling a differential amplifier in PSPice using MOSFET. Here is the schematic: In this i want to track the gain of the circuit by changing the value of the width of NMOS. Now can anybody ...
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54 views

Is it possible to control the speed of DC motors with Arduino's analogWrite() using analog pins? [migrated]

I'm trying to control the speed of two DC motors that are connected to a dual H bridge. I always used digital PWM pins with analogWrite() to change the speed, but ...
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1answer
47 views

JFET Audio switch, does not work in simulation?

This is a circuit I've found online and apparently it is taken from the very rare audio book by National semi. The circuit is used to switch a signal on and off at a transition time that the user sets ...
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2answers
76 views

Why mosfet is preffered over voltage divider for voltage level shifting

Before writing this question I read several similar threads, but didn't found the answer I am looking for. When we need a voltage level shifter the first thing that come to the mind is a voltage ...
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1answer
60 views

analog error pcb

I am building a scale with a load cell and a INA122 equivalent circuit. When I build it in a breadboard I get very good readings but when I place it on the PCB I only get a -3.8V at the output of the ...
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4answers
86 views

What will happen when two capacitors C1 and C2 are added in series instantly by a switching mechanism, How the charge sharing will take place?

Suppose there are two capacitors ( of capacitance suppose C1 and C2 ) .There is a switch S1 between them which is open for lone time .Initially the capacitor C1 is charged to a voltage V1 volt .Now at ...
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84 views

Signal on top of PWR line

See edits at bottom: I'm trying to design a network of circuits (see example below), in which a modular circuit (non-static, can be change, with high variability in current draw) is connected on any ...
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13 views

Pspice: Trouble in modelling an inverter using Current Mode Logic in Pspice

I am using or-cad 16.6 for modelling an inverter using CML logic family. I need a swing of 400mv with this inverter. I want to build this by using MOSFETS. Following is the schematic of the inverter: ...
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3answers
96 views

How do I perform logical operations without a micro-controller?

I would like to build some (hopefully) simple logic circuits without the use of a microcontroller. I'm a software engineer primarily so I think of things slightly differently. To implement this with a ...
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39 views

Gain in common source amplifier

Let us consider the Common Source amplifier depicted below: We know that the gain \$A_v\$ of a such circuit is given by \$A_v=-g_mR_D\$, where \$g_m\$ is the transconductance of the MOSFET. We also ...
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1answer
44 views

How can you build a floating two-port VCVS?

I have a control voltage at one point in a circuit which I need to duplicate at various other points (3 or 4, if I remember correctly). I'd like to use one potentiometer to control these voltages, so ...
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1answer
26 views

Value of Drain Current in BSIM3v3 in triode region

Here the value of drain current has been given as per the BSIM3v3 MOSFET model, but is there any reference where it has been shown how this value was calculated and what is the meaning of the ...
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20 views

Two different PMOS active load structure

The following is a extract from the book Model and design of bipolar and mos current-mode logic . Here we see one implementation of active load using PMOS. And this is how active load has been ...
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67 views

Analog Circuit Design

I posted this yesterday and it was deleted so first of all, let me apologize if i gave the impression that i was trying to get you guys to do my homework for me. i most certainly wasn't (sorry I'm ...
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1answer
40 views

Calculating gate resistor value for enhanced active-region stability

I'm working on an electronic load design driving an n-channel MOSFET with an op-amp. I'd like to consider adding a gate resistor (R3 in the schematic) to improve the stability. I've searched quite ...
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4answers
165 views

How to test analog component before mounting?

I have been in a small factory today, they produced 4 kind of PCBs that all are simple analog boards, each month they produce 1000 of them. The problem is that till now, after mounting them almost 10% ...
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1answer
28 views

Is ACS712 isolation sufficient for SELV?

Can the Allegro ACS712 current sensor be used to measure mains current with enough isolation so that the isolation between the mains (230V) side and the logic side of the sensor is enough to achieve ...
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3answers
202 views

4-20mA to 0-3V3 Converter

Looking for a simple design to convert from 4-20mA signals to 0-3V3, I'm thinkin about configuration shown at picture attached. And I would like to discuss its suitability. It is based on: - A ...
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1answer
76 views

Comparing industrial vs. off-the-shelf analog input

Industrial controls are expensive and my company current spends a great deal of money installing them to monitor some rudimentary signals on equipment. For instance, we're trying to monitor: ...
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2answers
60 views

Driving a solenoid with low voltage source

I have a 5V solenoid here, but my power source (battery) is only 3.3V . It's a pretty small solenoid, so it doesn't need huge amounts of power, but directly connecting it to the battery terminals wont ...
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1answer
41 views

Significance of -1 slope in CMOS inverter transfer characteristics

In the CMOS inverter transfer characteristics what is the significance of slope of \$-1\$ at the points where \$V_{IH}\$ and \$V_{IL}\$ have been shown? And how is this the occurrence of the values, ...
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29 views

Would an analog mux be able to output various voltages?

So from my understanding, an analog mux such as CD74HC4067E will be able to output diferent voltages based on its inputs. Thus for an example if I connect 4V, 3.3V, 2.2V and 0V to a 4:1 mux with 00, ...
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79 views

Analog power pins vs Digital power pins on chips

We usually have digital & analog power/voltage pins on our ICs. Analog power most probably for PLLs etc & Digital Power for Core. So, my questions are :- The different Analog & Digital ...
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39 views

Recommendation for Overvoltage Protection

I am now trying to design an adapter between an inverter and a simulator. I actually need to do some protection for the very expensive simulator on the design. I did my job for digital signals with ...
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2answers
117 views

Need to get more analog inputs Arduino Uno

Im making BattleShip on the Arduino: 2 x grid ((10x10 push buttons) + (10x10 led 5mm)) 2 x grid ((10x10 reed switches) + (10x10 led 5mm)) I made a 10x10 grid of push buttons by setting 10 buttons ...
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43 views

Capacitor used between DGND Vs CGND

In my project I was using Digital GND and Chassis GND. For Both GND connected with 1ME and 100pF ceramic capacitor in parallel. Due to PCB space constraints planning to use ceramic capacitor with ...
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1answer
53 views

Testing an Analog Front End prior to installing a Sensor

I've designed a circuit around the TI LMP91000, a configurable Analog Front End (amperometric potentiostat, for use with electro-chemical gas sensors). In addition the circuit includes a 2.5V ...
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1answer
40 views

Proteus VSM: digital vs analog resistor and LED

I'm a newbie to electricity and electronics in general. I've been reading about the principles and have a basic understanding of them. I'm also diving into creating my first basic circuits with ...
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1answer
71 views

Analog to digital conversion: are natural number values possible with an amplifier?

I drew this circuit up for a project in Multisim. The inputs for V1 are -0.25 to 0.25, and the outputs are 0v to 10v. When -0.25v is inputted the output should equal 0v. But its giving me an output ...
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44 views

Use of linear optocoupler to provide safety for analog input of BeagleBone Black

I need to connect a thermocouple (output 0 to 10 V) to a BeagleBone Black. I have planned for a voltage divider circuit to do that as BeagleBone accepts only 1.8 V as its analog input. Do I need to ...
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32 views

analog circuit nodal analysis

I had difficulty in evaluating following circuit's node analysis to find the transfer function. I had difficulty because of the ground in the middle of the circuit and the way the source voltage is ...
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1answer
15 views

initial state in s domain

in question below I couldn't' evaluate the initial state for inductors and capacitor in order to do the s domain analysis. If you can also show me how can I draw the circuit for inital state, I would ...
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1answer
33 views

Acs712 current sensor ic interfacing with ade7858(energy metering ic)

I am trying to interface Acs712 current sensor IC with an energy metering Ic(Ade7858),there are two problems am currently facing. 1) The energy metering Ic takes in bipolar input (± 0.5 V) which is ...
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2answers
121 views

How to design blinking LEDs circuit using analog elements only?

I want to design a circuit to blinking three LED in a row with 2 second delay for shifting/changing using analog elements only (using Resistors, Capacitors and Transistors and without Micro ...
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1answer
36 views

BC550 Darlington Clipping

Evening Guys, The amplifier shown below is clipping before the rails of my supply. I have narrowed the issue down to the Darlington pair before the Emitter Follower output stage and provided the ...
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16 views

Composite Video over Fiber at DWDM frequency [closed]

I am trying to set up an analog test system to demo the capability to transmit an analog signal over fiber at a specific wavelength (in DWDM ITU channel range). I would like to grab a video output ...
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1answer
57 views

How can I calculate time constant and charge time of RRC circuit?

This circuit is part of my time delay circuit. I want to calculate exact value of delay time. Please help me. simulate this circuit – Schematic created using CircuitLab
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1answer
51 views

PIC microcontroller DAC output incorrect

Using a PIC16F1825 microcontroller I was seeing incorrect values being output on the DACOUT pin. The setup stipulated using the fraction 8/32 * VREF+ where VREF+ was an external 2.5V reference. The ...
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2answers
54 views

Power measurement on neutral instead of line

what is the advantage or disadvantage of measuring the power on neutral insted of line in a single phase wiring. Generally I have observed that metering chip is given input from line to its Vin or ...
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0answers
19 views

Circuit to integrate BeagleBone Black with Pressure Regulator

I am using BeagleBone Black as controller to control a proportional pressure regulator (Festo VPPM-6L-L-1-G18-0L10H-V1P-S1) which is the actuator of my project. The pressure regulator has an input ...
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1answer
37 views

Analog Multiplexer

In what ways can an analog multiplexer i.c fail? I want to use this in our system ,so i need the complete details of it,so that even if the mux fails,the output should connect to one of the input ...
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1answer
24 views

BCD Switch Resistor Network for Proportional Voltage Output

My goal is to wire a BCD switch in a 5 volt system and get a voltage proportional to the 0-9 on the switch. My first thought was BCD -> R/2R network. That does not work because the R/2R network ...
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23 views

S domain analysis initial state

Hello, I have a question about s domain analysis. I couldn't handle the initial state part since there is both dc source and an ac one. If I could do the initial I will be able to solve the rest by ...
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96 views

Arduino analog interrupt LDR

I am using an LDR on an Arduino Pro Mini with an analog interrupt. The Arduino goes to deep sleep when there is no light or it's not busy: Sleepy::powerDown(); ...
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2answers
62 views

Analog Sensor of 0 to 10 v connection to BeagleBone Black

I have an analog sensor(Thermocouple) which provides an output voltage range of 0 to 10 volt. I want to connect it with a Beagle Bone Black. BBB accepts 0 to 1.8 volt as analog input. I thought of ...
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2answers
68 views

A circuit or an i.c that will give a digital output high or low based on whether the input signal which is analog and is around 3.3V

I need to check the performance of a DC/DC converter's output.The converter should give 3.3V and does contain frequencies upto 8kHz in it(after using low pass filter).The bearable range for output ...
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3answers
87 views

How to change analog sensor signal to appropriate levels for microcontrollers?

I have a FUTEK CSG110 amplifier, conditioning a signal provided from a load cell, providing a -3V to 3V signal. I can change this range to my liking, however I will be stuck with a +- voltage ...