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

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Generating very low noise control voltage from an MCU?

I want to control the THAT Corp. 2180 VCA using an MCU. I'm using the positive VC input (it has one positive and one negative and they are symmetrical). The range that I want to generate is +/-540mV. ...
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75 views

Analogic Audio via Arduino [on hold]

I need to make a project with Arduino. I would know how take an analogic signal from a Arduino's shield (if exist) and send via wireless. Sorry for question I am new. Thanks for answers.
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34 views

Reading analogue input using digital GPIO

I'm using soil hygrometer to measure soil moisture. Since I don't have adc I'm using This method. Please tell me how to connect resistor and capacitor along with amount of resistance and capacitance. ...
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2answers
72 views

How to analyse this diode circuit

what will be the voltage at Vx if D1 and D2 are practical diodes This is not a problem from some text book. This circuit came in my mind while i was studying differential amplifiers.
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0answers
75 views

Would this JFET+op-amp circuit work?

This is Figure 9-3(b) from Motchenbacher - Low-Noise Electronic System Design, so I would expect it to work, but I don't understand it: The addition of a discrete common-source stage at the input ...
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2answers
65 views

Voltage Controlled Second Order Low Pass Filter

First time poster. Please be kind! I'm working on an analog synthesizer project and recently started looking at Voltage Controlled Filter designs. I've scoured the internet for a low pass ...
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0answers
27 views

Analog to digital converter for PIC18F2420

I am trying to get digital value in PIC18F2420 from analog input. The analog input is connected to RA0 port. Following is the code. I am getting 0 value for my interger "myvariable" when i look in ...
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0answers
48 views

MC34063 issue. Switches off every cycle

I am using MC34063 in step down configuration but the converter switches off every cycle. Following are the calculations and specifications: Vin - 9 to 12V Vout - 5V Imax - 0.3A Rsc - 0.36 ohms L - ...
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1answer
47 views

Insight on analog and digital Lock-in amplifiers operation principle?

As far as my knowledge goes, in the analog case, the discrimination of the, low S/N ratio, signal is done by (demodulation) comparing it to local oscillator with almost identical frequency and then ...
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45 views

Reading analog value in PIC18f2420 [closed]

I am kind of new in C programming and learning it at the moment. I want to the read the voltage signal at RA0 pin of PIC18f2420. Following is the code, I am not ...
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4answers
73 views

Max potential difference that can be created in an analog signal using a microphone

I am a total newbie. The main idea behind all this is that microphone produces analog signals which are fluctuation in Voltage.. So can I use an amplifier to amplify these Voltage? And after it can ...
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1answer
38 views

What is this process called: Analog input, with a analog output with setpoint

What is this process called: In my example the analog input represents line current. The analog output represents voltage. this is a closed loop with a target set point. The behavior would be that ...
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1answer
89 views

How design a circuit to control a switch?

I would like to know how I can design a circuit that can control the switch in the diagram below? Output of the circuit should provide TTL operant to open close the switch that control a 12 V DC.
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2answers
35 views

Instrumentation amplifier and op amp V+ and V- shorted internally

I have an INA2126 instrumentation amplifier and an OPA277 operation amplifier. I was trying to check if it is busted or not by using the continuity test of the analog multimeter. I'm not sure if it's ...
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1answer
41 views

PWM vs Analog Signals

Oftentimes in EE classes we learn about AC analysis and phasors and other stuff heavily based on analog signals. I also know that many digital applications approximate analog signals using PWM. But ...
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0answers
66 views

Circuit Analysis Confusion

Circuit (Mosfet Active Load Differential Amplifier): Note: This is not homework. I want to be able analyze circuits well, and currently my understanding of circuits is weak. In my textbook, I do ...
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0answers
57 views

Interleave two analog signals

I am trying to interleave two similar but not identical pass-band (analog) signals (i.e., both have a center frequency of 15 MHz, and a bandwidth of 200 kHz) on a sample by sample basis. The idea is ...
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1answer
70 views

Non-inverting op-amp with DC offset

I'm trying to amplify an AC wave (from an audio input) with a maximum amplitude of about 1.8v to a DC oscillation between 0V and 5V with the centre (what would be the zero-crossing on the input) at ...
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2answers
70 views

Analog vs Digital attenuation for an ADC

I'm designing a digital parametric EQ that will go in front of a high gain guitar amplifier. I want to have the option to boost signals up to 12dB. I plan on implementing this either by attenuating ...
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2answers
141 views

Circuit Implementation of Dynamical Systems - Lorenz Equations (Failure Analysis)

Let me begin with the disclaimer: I am a mathematician and not an electrical engineer. That being said, surely I am missing something simple. For classroom demonstrations in dynamical systems, I have ...
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3answers
76 views

Schmitt trigger

Why does feedback on the inverting pin and input on the non-inverting pin result in an amplifier (non-inverting amplifier) while feedback on the non-inverting pin and input on the inverting pin result ...
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1answer
32 views

Partial load failure detection circuit

I'm working on the power supply of a temperature controller which sends about 5kW of power maximum (230VAC 50Hz) into 3 sets of 12 heaters (actually, 3kW + 1kW + 1kW). I'm at the stage where I need to ...
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2answers
77 views

How to measure current with an analog multimeter? [closed]

I need measuring the current through a dc motor with an analog multimeter, but I don't know how to select the correct function to that. The meter is a FT-360TR. I know it can measure currents of ...
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1answer
41 views

strange temporary shorting

I was testing a board of mine. I was testing the boards for any shorts. I have 3 Voltage planes 12V,5V and 3.3V. I was using a multimeter in the connectivity/short mode to test if the Vcc and GND are ...
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2answers
55 views

How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
2
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1answer
105 views

Ohmmeter not working as expected

I am trying to build a simple ohmmeter by creating a voltage divider and then using an analog pin on a PIC18F2550 to read the output voltage and determine the ohmic value of one of the resistors. I ...
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1answer
79 views

Sigma Delta ADC for “quasi-DC” signals

I am designing a \$\Sigma\Delta\$ ADC. Most of the high level specs are already set: order = 2 1 bit quantizer OSR = 256 (or 512 if needed) signal band: 100/200Hz We expect some 16bit output, i.e. ...
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2answers
47 views

johnson counter sine wave resistor network

I saw one schematic which uses an 8-bit shift reg to produce a sine wave with a resistor network. I am guessing the resistors will be voltage dividers, but how are the values calculated? I tried to ...
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1answer
72 views

Log amp with vacuum tubes

is there a way to build a log amplifier using vacuum tubes? I would like to have a VU meter (with the proper log response), but do not want to use solid state components. The output would be to a ...
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1answer
76 views

Multiplexing analog signal

I want to read 4 analog signals (coming from 4 pH sensor, generally said 16HZ freq.) With one buffer op-amp circuit going into a single ADC channel. Is it possible to achieve this using analog MUX ...
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1answer
68 views

alternate astable multi vibrator design

Is there any alternate way to design Astable Multi Vibrator with use of only Resistor & capacitor ? ( avoid 555 Timer ) , avoid BJT if possible. my aim to make most compact Astable MV.
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1answer
39 views

electret microphone dynamic impedence

how much is the dynamic impedance/resistance seen from a electret microphone? I am trying to design a microphone preamp and need to know seen resistance in small signal from the signal source ...
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2answers
58 views

Replacing a tactile switch with an ultrasonic ranger

I'd like to have a switch activated when something gets near it. Today it's just a pushbutton, that's active as long as it's depressed. I'm going to use an analog ultrasonic ranger, using its analog ...
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27 views

Using the thermal expansion as the driving mechanism for an analog switch

I'm not sure if this is the right place for this question or if physics might be better suited... I've been trying to solve for an analog switch engaging when an element reaches a temperature of ...
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2answers
74 views

What is The Difference Between PAM And ASK

In Digital Communication can We use PAM in place of ASK The Diagram is Given as The Book Later Talks about Symbols. I Don't Understand, in PAM we don't have specific signal as input like in ASK ...
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1answer
31 views

Analog modulation trainer

i am making communication trainer as my FYP i am confused on analog communication module .. I have 2 options first one to make different blocks of analog like mixers, filters , amplifiers ,phase ...
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2answers
64 views

DC analysis of common source MOSFET circuits to find gate voltage using different power supplies

simulate this circuit – Schematic created using CircuitLab strong text I am solving problems on DC analysis of MOSFET circuits. We are supposed to find various parameters like Id(Drain ...
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1answer
21 views

How input and output multiplexers work in ADV7800?

I was going through IC ADV7800 datasheet, getting confused with the functionality of two multiplexers given in its block diagram. Attaching picture of the same. For first MUX there is 12 inputs and ...
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2answers
115 views

Need help with a VU meter analog signal

I am making an Arduino VU meter. I need to convert an analog AC audio signal to a varying positive DC signal. I would like the following outputs: 2.5 V output at 0 V input (from VM1); 5 V at maximum ...
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0answers
17 views

Sensor analog output changes while using Xbee

We are using a adafruit noise sensor for activity detection. We have setup it with Arduino Promini. It works well. But when we attached Xbee Pro S2B with our setup, the analog reading of noise sensor ...
4
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4answers
707 views

Building a short term analog memory. Would this work?

As an engineering student, I'm trying to think of an analog equivalent to a flip-flop. My goal is to have a short term memory of a signal, saturating the transistor being the trigger. Kind of like an ...
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6answers
149 views

Analog filter design

I have designed my analog low pass filter using LM358 op amp. I used r1=r2=330 Ohm and c1=c2=100nF. The cut off frequency =4.8 KHz. But i dont know where its going wrong , my attenuation which should ...
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1answer
48 views

Depicting Analog Signal Paths graphically

Is there a 'standard' way to depict analog signal pathways / chains that's simple, concise, and not too mathematical? I've been searching online, but can't seem to figure out what such a diagram is ...
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0answers
23 views

How to measure the QoS of an anlog wireless link

I am working with FSK transmitter and modulator on the 433 MHz band, I am wondering how can I measure the QoS of the resultant link given that The receiver reports the received analog data only with ...
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1answer
31 views

5v or 6v operating dc-dc for mobile battery?

For mobile battery, what voltage is suitable btwn 5v or 6v? What factor does influence on choosing different voltage for mobile battery?
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2answers
273 views

What is the steepest roll-off achievable for an analogue low-pass constructed with a single op-amp?

I was wondering about this question. What if the only design requirement is having the highest steepness of the roll-off but using only one op-amp? I know it's possible to construct approximations of ...
0
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0answers
51 views

Upper values of analog reading of sensor is cut off

We are using a dual element Motion sensor for our project. Here is the link of sensor we are using. Dual element Motion Sensor You can find the datasheet in the same link. This is our circuit ...
0
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3answers
77 views

Opamp Voltage Doubler Unstable (After Extended Operation)

I've been working on a circuit which would drive an industry standard pneumatic regulator (E/P transducer). The transducer takes a standard 0-10V command signal with a typical input impedance of 6.5 ...
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1answer
35 views

Simplest way to get a rising edge (0 to 1) for a digital input from a selectable value of an analog signal?

I'm trying to trigger an interrupt on a digital pin of a Raspberry Pi (although the question is valid for any microcontroller), based on an adjustable threshold value of an input analog signal (say 0 ...
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2answers
68 views

How can I make a log amplifier's logarithmic region span across the range of 0-5V input instead just working close to 0V?

I need to implement a log amplifier. Currently I'm doing it using a diode in the negative feedback loop but it only really gives me the log response close to the zero input, with the amps output ...