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

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74 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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33 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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0answers
15 views

Composite Video over Fiber at DWDM frequency [on hold]

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
38 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
40 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
50 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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16 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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31 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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19 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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21 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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2answers
50 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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1answer
39 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
55 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
74 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 ...
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1answer
42 views

How long can 0-10V wires for valve control be?

I'm thinking about controlling a valve for fan coil coolant from a distance of approximately 10 meters. The control signal is 0-10V, and the impedance of the regulator is stated to be 100k ohm. ...
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3answers
77 views

How to calculate resistors and capacitors values for analog RC filters?

How to calculate resistors and capacitors values for band-pass RC filters based on LM348 operational amplifier? In this example, 3.2KHz, 4.3KHz are standard center frequencies, that are individually ...
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1answer
36 views

ADC output level query

This query is related to my old post: ADC outputs random values to constant input I made further tests, and still struggling. The reason I made a new post is, the query is different. I am using FPGA ...
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1answer
30 views

NO Relay Triggered By a Proximity Switch. I'm ignorant, don't know what to look for

I'm asking for help after spending a couple of hours trying to learn the proper vocabulary. Bottom line is a KISS 24v dc powered NO switch triggered closed by a 3 wire proximity switch. Or do I need a ...
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1answer
52 views

Sampling many low voltage analog signals

I'm trying to sample 128 low voltage (a few millivolts) analog signals at around 800 samples/second. My original idea was to hook up 128 instrumentation amplifiers to 128 ADCs, but that turned out to ...
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1answer
24 views

Polarity of feedback in a feedback circuit

How should I check whether the given configuration has a negative or positive feedback. I am stuck because, I know that as Vin increases the drain current will increase but after that I don't know ...
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2answers
62 views

What is the analog bandwidth of general purpose ADCs?

I am making use of the dsPIC33FJ64GP802's ADC to do Undersampling and for that, I need to know the analog bandwidth of the ADC of this Microcontroller. My signal is around a few MHz. I have already ...
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1answer
29 views

How much sensitive to thermal cycling are passive components?

One of my boards, which contain solely passive components, may be subject to high thermal cycling (up to +/-100°C, but tradeoff down to +/-30°C is possible). What sort of degradations can they ...
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1answer
60 views

Current regulator with controller?

I want to implement a circuit which allows to regulate the current flowing to the load. I have two use cases: Case 1 is the normal case where I would set the max. allowed current with a ...
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1answer
22 views

How to make a negative flank to a negative pulse from normal state not connected?

I have a reset signal which should be triggered by a falling flank from 5V to 0 volt. This flank should generate a low pulse (5V -> 0V -> 5V). This can be done by just adding a capacitor and a ...
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1answer
64 views

How to design a Design a 64 x 8 memory using two 16 x 4 RAM chip? [closed]

Can someone suggest how I would start this project? I want to design a Design a 32 x 4 memory using two 16 x 4 RAM chip.
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21 views

Sigma-Delta RC Filter

I am using a MSP430F427A to measure the voltage across a current shunt for coulomb counting stage of charge monitoring. Just looking at what kind of filter to put at the input of the SD16 ADC, and the ...
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1answer
59 views

Arduino analogue input from headphones

I want to use the electric signal from the headphones (2.5mm) of a NOKIA E51 phone as an input to Arduino. My intention is not to process the audio signal but rather to be able to detect when there is ...
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73 views

Why does a Colpitts oscillator oscillate at a particular frequency?

The feedback network used in the Colpitts oscillator is an LC circuit is shown below. I understand that the phase difference between the terminals 1 and 3 is 180 degrees. Also the amplifier output ...
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4answers
298 views

chopper-stabilized op-amp latching up, cheap op-amp doesn't

I have a simple pressure sensor buffer/amplifier that I'm experiencing some weird latch-up when using a fancy chopper-stabilized op-amp for U2. The pressure sensor is an MDPS-002 (the 700kPa ...
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2answers
66 views

Level shifting 8 output IO Expander from 0V-5V to -2.3V to +2.3V

I have a circuit problem that I'm trying to find a solution for. I have an 8 output IO expander which outputs 0V-5V. It is running analog switches which have a Vdd and Vss of +-2.3V. Using the 5V ...
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1answer
35 views

low dropout regulator output voltage

I want to use the DMOS low-Dropout regulator REG102 3V3, but in the datahseet REG102 of the regulator i found two configuratons. The first configuration is without resistors divider and by connecting ...
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2answers
33 views

Generate TTL-level reset pulse from RS-232 level signal

(My knowledge of analog circuit design is severely limited). I am trying to generate a reset pulse for an AVR microcontroller. The reset is active LOW, and the maximum threshold voltage is 0.9V, with ...
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29 views

Understanding Baxandall's tone control ckt

I am learning to understand and design filters.. I was unable to design a ckt to control bass as well as boost (passive)... which would have transfer function (for boost) H(s) = (s+k)/s I came ...
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67 views

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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40 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
77 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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101 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
85 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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31 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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62 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
57 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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4answers
78 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
42 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
92 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
37 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
49 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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92 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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62 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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83 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
75 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 ...