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

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ECG Signal Measurement using Plessey PS25201

The above said sensor measures the change in the electric field. Data sheet link : Click here When I measure the output from the sensors directly on the CRO with finger placed on the sensor; the ...
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4answers
101 views

Methods for converting PWM to +/- 10v Signal

Suppose we have a PWM signal which controls the speed of a motor and a digital pin which specifies which direction a motor is travelling in, how can we convert these signals into 1 +/- 10V signal ...
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26 views

Can you use a PLL to suppress a carrier

I am trying out a simple ultrasound Doppler system , where I transmit a 40KHz signal and receive it with micro-Doppler modulation on it. As opposed to regular radio channels, the returned carrier is ...
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1answer
32 views

Integrating Gefran Linear Potentiometer PY1 with Beaglebone Black

simulate this circuit – Schematic created using CircuitLab I want to connect one Gefran Linear Potentiometer with Beaglebone Black for displacement measurement purpose. The signal ...
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2answers
74 views

what is the maximum output voltage from an opamp in general case?

In general, what is the output voltage that an amplifier (not rail-to-rail output type) can provide,if it is supplied for example Vdd=+24V and Vee=-24V which is the maximum value I can get "for sure" ...
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1answer
28 views

Calculate the parallel value of resistors at base of common emitter amplifier

I don't know if questions can be asked like this here but if they can I want this question. In an exam paper I saw a question to determine the parallel value of the R1 and R2 resistors in the image ...
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1answer
50 views

How to reach 20MSPS with a 20 MHz clock in SAR? [on hold]

What does this 20MSPS actually mean? Also, an n-bit SAR ADC takes n+2 clock cycles to complete a calculation, then how will I be able to reach the 20MSPS rate using a 20 MHz clock? I have be given a ...
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3answers
58 views

Gain vs Output Impedence

I am currently trying to improve my understanding of analogue IC design and my textbook kind of brushes over this problem. It is made quite clear that a low output impedance is desired so that the ...
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0answers
29 views

High Performance Analogous Computing [closed]

Could we use DAC -> some element -> ADC as a digital function core(sine,power,division,...)? Assuming "some element" here could be: has an input to imitate "point charge" Q has an analog pseudo ...
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3answers
51 views

Linear Rise exponential fall pulse generator

For a neutrino detector related experiment, I need to design a circuit which generates the pulse similar to the detector. This is required to test the front end electronics. Here are my final goals: ...
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3answers
70 views

Voltage proportional comparison (division?)

I'm looking for a circuit that produces an output voltage which represents the voltage between A-B compared to B-C here. IE if AB is 10V and BC is 1V, the output is 10V, and if AB is 10V and BC is 2V ...
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2answers
212 views
+100

Unexpected Sensor Output Voltage Rise

I'm using a Shinyei PPD-60PV particulate sensor in a product and I've noticed something very odd in testing, and I don't know how to explain it. It's connected to a WildFire board by way of cabling to ...
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1answer
30 views

Design of the two stage amplifier with p-type input

I have to design the two stage amplifier with p-type input (p-type diff pair), the schematic bellow: However, mostly tutorials discuss the same architecture but with n-type input. My main ...
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1answer
39 views

Analog signal vs. Alternating current

I am seeing that both of the analog signal and alternating current is represented by the same graph: As far as I think I know, an alternating current travels back and forth with gradual changes in ...
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0answers
95 views

I need ANY Analog Multiplier schematic?

I need a working schematic for an Analog Multiplier (the device output is the product of two input voltages) as a small part of a university project. Have searched the internet heaps, but cannot find ...
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1answer
44 views

Safety considerations when using LED and a comparator

I want to make a simple circuit, it uses two comparators to drive two LEDs, it should turn the LED (green) if the voltage is higher than let's say +2.5V. If is lower then turn the first one off and on ...
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1answer
61 views

I/O card couples analogue ground to 0V - how can I work around this?

I'm building a system that has to measure analogue voltages accurately. This system is being tested using PC-based test equipment that has an expansion card in it generating both digital and analogue ...
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0answers
27 views

Stamp Errors in layout

I am working on layout. I have two power supplies. For this when I took a via from Metal1 to n well I got no issues. But when i consider another via from Metal1 to n well, I am getting the following ...
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1answer
40 views

analog shut down whilst turning on an LED

I am a EE student from Denmark, in the middle of making a class D audio amplifier. In this matter, I have stumpled across a needed circuitry. I need a way to shut off my gate driver (essentially the ...
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57 views

Level Shifter working

I am trying to understand the working of a latch based level shifter as seen in the attached image. Input Signal (In) ranges from VL to 0 & the output signal (Out) ranges from Vi to VH, where ...
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1answer
86 views

Make an analog pulse generator [closed]

I'm working on a project that requires an pulse voltage with a frequency of 50 Hz and a duty cycle of 5 to 10%. How can I make that with analog circuits? I've a DC voltage input from 0 to 5 volts and ...
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1answer
36 views

Thin film SMD resistor reliability

I am hoping someone can point me toward some clarity regarding the durability of thin film SMD resistors. Google pointed me toward a number of pages that indicate they are sensitive to humidity and ...
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3answers
60 views

Chain 16-channel analog multiplexer/demultiplexer

I'm trying to figure out how to chain six 74HC4067 or similar 16bit multiplexers. My goal is to read multiple analog inputs one after another with Arduino. I have only 1 analog pin input and 7 ...
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2answers
52 views

Is it OK to combine passive and active filters?

I am a newbie to filter design. I would like to know: is it common to use a first step active filter followed by five or six passive LC-filters for very high orders? Or do people usually don't combine ...
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1answer
77 views

How to find the resonant frequency of a human body?

I've read that the human body has resonant frequencies somewhere around 50MHz. I also think it would be interesting to look for values in other ranges like 10-100 kHz. I'm wondering how to build a ...
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1answer
39 views

External Power Supply Grounding Scheme

The following are two possible grounding schemes for a sensitive instrument that contains high gain analog circuits and potentially noisey digital circuits: This circuit is connected to an external ...
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1answer
52 views

status equations of 2° order circuit

I have a problem with this circuit I can't write the status equation because the system that characterizes the circuit is coupled respect to derivatives of the difference of rings currents. Let ...
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1answer
29 views

BJT gain.Width of base region vs collector current

We know that in active region Ic=beta(Ib),so it means that as Ib decreases the Ic should decrease proportionally,but the early effect states that as we increase Vce the width of the base region ...
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0answers
25 views

What causes Arduino UNO to burn out with analog input of 4V and no power to board? [closed]

I have an arduino UNO R3 board and a Keyes SD card data logger shield operating on a 12Vdc wallwart supply that we are using to monitor battery voltage on a 24Vdc off-grid solar system. We collected ...
3
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2answers
89 views

OpAmp: Calculating A - MAX(B, 2V)

I require an opamp-based circuit that calculates the expression OUT = A - max(B, 2V), as shown here: There are no strict requirements on the shape or exact position of the transition, however in the ...
2
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2answers
55 views

Analog circuit for multiplying in the frequency domain [duplicate]

I have an idea I want to experiment with - doing boolean logic with analog (OFDM) signals. Each frequency component represents a different 'bit'. A key factor is performing the AND operation. I would ...
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1answer
53 views

Voltage Conversion Module

So firstly i'd like to say I'm relatively new with electrical engineering, nothing more than backyard experience. However I am a computer programmer so I can grasp the concepts fairly well. One of ...
3
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1answer
46 views

Can we determine if a filter is butterworth or chebyshev from its physical topology?

Can all analog filters be classified as Bessel, Elliptic, Butterworth or Chebyshev? Given a physical ladder topology of several stages of {L, C or LC} in {series or parallel}, is it possible to ...
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1answer
50 views

Inductor's self-resonant frequency: Do we want it to be high or low?

Inductor selection always confuses me. There is a spec for inductors as self-resonant frequency. For example, on digikey, as SR frequency of inductors increase, the price may increase or decrease. But ...
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working of operational amplifiers circuit [duplicate]

IN the Following Circuit, the opamp is neither working as buffer nor amplifier. kindly explain the working of the circuit. Its single supply opamp with 5 volt supply voltage.
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1answer
66 views

Reasons to use an analog temperature sensor instead of a digital one

I'm designing a microcontroller-based system that includes a thermostat. When choosing which temperature sensor to use, I noticed that analog ones have more or less the same power consumption, the ...
2
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1answer
59 views

Arduino's analog input pulling down voltage when off

I'm got a PCB manufactured, where a Arduino (Mega2560) is (via a 5V Buck converter) supplied by a 4S LiFePo4 battery which is secured by a custom BMS system. The system is measuring the voltage of the ...
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1answer
29 views

Independently toggling two series switches to multiply two pwm signals

Preface It is known that one can synthesize a signal into a train of boxcar pulses (pwm modulation), each with the same amplitude, if proper low pass filtration is applied to this pulse train before ...
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1answer
49 views

2 Layer power routing with mixed signals

I am working on a BLE Gamepad project using a module based on the Nordic NRF51822. This is the first project I have done that is more complicated then an arduino project so I am likely to make some ...
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1answer
83 views

0-5V PWM to analog 0-24VDC voltage with MOSFET

Im having trouble understanding how or if it even is possible to regulate a voltage with a MOSFET. I want to regulate an output voltage of 0-24VDC 0.5A(continuosly) with the duty cycle of a 0-5V 1kHz ...
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2answers
39 views

Thevenin Equivalent does not seem equivalent for me

The application of Thévenin theorem should give a equivalent circuit in terms of current and voltage of any linear circuit consisting of independent sources and resistances. Given this sample ...
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0answers
51 views

dc power isolation techniques

I need a circuit or a technique for DC power isolation. What i want to do is below; How can i do DC isolation between power and load? Can anyone suggest me several methods?
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3answers
59 views

Voltage divider output with analog voltmeter

I'm using a voltage divider to bring down 24V to 5V and attaching the output to an analog voltmeter gauge. So my question is should I be counting the resistance of the analog gauge into the value's of ...
0
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1answer
98 views

Help explain how this ac switch circuit works

Below is an ac switch circuit. COIL1_EN is used to enable or disable the switch. Does any one know how this ac switch work? I think it may be a standard design, can anyone give the related ...
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1answer
65 views

Will A Logarithmic Potentiometer Linearise A Capacitor Charge Curve?

I want to use a rising voltage on a capacitor to set more than one trigger points for events via comparators; that is when the voltage reaches a certain level, the comparator goes high. For ease I ...
0
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1answer
29 views

AC Analog Isolation

Please excuse my limited knowledge of electronics, my problem is I've a circuit which is driven by a variable AC signal using LabVIEW it ranges from 100Hz to 100kHz (I can lower this to 30-50kHz if ...
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2answers
84 views

I need some help with analysing this differential amp

I'm having some trouble with analysing a differential amp. The amp and its associated operating parameters are in this link (question 1) http://imgur.com/iS6fD5N What have I done so far? Well I've ...
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1answer
115 views

Are there any circuits to get output as a sum of a set of current sources?

I have 3 current sources (I1, I2 and I3) and I need to get an output of linear summation of the current of these sources. Iout = aI1+bI2+cI3 where a,b and c are gain factors (like 1 to 10 and are ...
2
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0answers
32 views

Help to translate jitter design constraint in a frequency synthesizer design with 4046 and 4017 ICs

I'm trying to design a frequency synthesizer with the old-school 4046 and 4017 ICs, with a scaling factor N = 1,5,7,10. The input signal is a square wave with adjustable frequency from 1 kHz to 10 ...
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1answer
71 views

op amp oscillation problem during chip measurement

I had an oscillation problem when testing my fabricated chip. As shown in these figures, the transient waveforms of the op amp outputs got severe oscillations. Ch1 and Ch2 are the two output nodes and ...