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

learn more… | top users | synonyms

2
votes
2answers
59 views

Issues related to multiplexed analog signals

I had an idea to transmitte a measured voltage of component X, from multiple slaves to one master device. Each slave's units would use the principle of time division multiplexing to set the data line ...
0
votes
1answer
41 views

AC supply to digital output

I need to sample 8 power switches connected to 230 Volt supply. I want to record the status of these switch every 10 seconds and send to cloud for which I am using arduino with ethernet shield. For ...
1
vote
2answers
47 views

Will EMI strongly affect my sensor reading

I'm using an Arduino to read analog values from my sensor running at 5V using a voltage divider. The sensor contains a force resistive sheet where the resistance of the sheet decreases as force is ...
1
vote
3answers
208 views

Can somebody please analyse this circuit

Can somebody explain to me how this circuit works? i understand that it is an audio amplifier circuit and it inverts the signal, and inverts it again, but i am not sure why this is the case. also ...
0
votes
1answer
45 views

Bipolar Voltage to Current Converter

I need a circuit or component which converts bipolar voltage to bipolar current. I have found the XTR111 from Texas Instruments and the 1B22 from Analog Devices. However, they only convert 0-10 V to ...
2
votes
2answers
127 views

Why there is no decoupling capacitors in analog IC

Here is a CMOS two stage amplifier. As you can see there is no decoupling capacitor at all. Also I don't see decoupling capacitors that are used in CMOS integrated circuits. Could you explain why? ...
0
votes
1answer
60 views

Splitting AC voltage based on phase

Is it possible to separate the positive and negative portions of an AC voltage wave into two separate lines, where one line has the positive voltage portion (and is neutral when the source is ...
0
votes
2answers
97 views

What are the differences between function generator and oscillator? (Specific design)

I design the attached circuit: 75 MHz Sine wave that connected to R and C in parallel: In the output, the amplitude of the sine wave is changing according to the C, more capacitance smaller ...
-8
votes
0answers
50 views

How does Caller ID work on traditional landline Telephone systems?

I was hoping you guys could help me out, I was recently thinking about the Traditional analogue Phone System that we use in our homes and wondered "How does a landline Handset receive the number from ...
-6
votes
1answer
49 views

microelecectronics doubt [closed]

I was going through Sedra and Smith (6th edition) and had a doubt. In example 4.11 (page-405), how do we know in a question if we have to join G and S terminals and there will be a current flowing ...
0
votes
0answers
3 views

how to connect multiple power speaker by using splitter [migrated]

I have 5 self power speakers.. I want to connect this speakers to my computer by using 3.5mm audio jack splitter...is this possible ? does it make any effect on audio single or sound quality? and ...
0
votes
1answer
51 views

How can I derive a voltage equivalent without affecting the output?

In the above schematics, I want to make the equivalent of the circuit on the left side. What I mean is I want to derive V2 from V1 and get rid of using two supplies. I want to derive V2 from V1 by ...
0
votes
3answers
93 views

How to reduce tape hiss while recording a cassette tape with digital data as source

I bought a few Maxell cassette tapes, a portable Sony cassette tapes recorder (with the possibility to record also from an external microphone: in my case, a jack connected to the PC) and - as already ...
0
votes
1answer
26 views

A small signal NMOS transistor

I am reading an application note entitled Using MOSFETs in Load Switch Applications This part says that Q1 is a small signal NMOS transistor. Could you explain what does it mean by "small signal ...
1
vote
1answer
23 views

How to using a 3.5 mm stereo plug mic with a EM11G LM 386N-1 amplifier

I have built a simple amplifier circuit using a EM11G LM 386N-1 amplifier chip which follows the following design (cap and resister values are slightly different): I connected this mic to the ...
0
votes
2answers
51 views

Keep a Relay ON until Switch closes

Im trying to fix an egg incubator, currently has a mercury switch (when the temperature reaches two points on the glass, the mercury completes the circuit, it has small holes and some metallic strips ...
0
votes
1answer
75 views

Analog pinouts of the ATTiny85?

I'm looking to buy a ATTiny85 for a school project. We require 4 analog inputs for our LEDs which we're using as makeshift light sensors (this part of the project is sorted). I've read the the pin ...
0
votes
2answers
66 views

audio-taper potentiometer in 50-100 ohm range [closed]

Anyone know where to source an audio or logarithmic taper potentiometer in the 50 or 100'ish ohm range ? Mouser and Digikey don't show anything, even non-stocked. I'd like to build an adjustable ...
1
vote
1answer
52 views

How to build an Audio Spectrum Analyzer/Sensor?

I am designing a smart RGB LED strip driver based on a Raspberry Pi and an Ardunio. The Ardunio would controll the LED strip, and other LEDs connected to a shift register, while the RPi would manage ...
1
vote
1answer
57 views

Anolog signal amplification with single supply

I have to amplify an analog signal 0 - 0.3v from a sensor to 0 - 2.5v which the XBee's analog input accepts and onlt have access to one 3.3v and gnd power supply rail(no negative rail). I've tried the ...
0
votes
0answers
26 views

How does decoupling a photovoltaic module from the grid during freewheeling reduce common mode current in transformerless inverters?

Vcm = (Van + Vbn)/2 In Bipolar SPWM the common mode voltage is constant (Vd/2) but in Unipolar , the common mode voltage varies at switching frequency(Vd/2 and Vd).. In unipolar SPWM how does ...
0
votes
0answers
37 views

74HC4051 Analog multiplexer settling time

I have simple schematic for multiplexing single ADC input to multiple analog inputs, made from LMV934 buffer and 74HC4051 analog multiplexer. The problem is, after selecting desired analog input, ...
2
votes
0answers
25 views

Monitoring a large array of load cells

I have a large array of 8x8 load cells I'd like to monitor, and I'm looking for an efficient way to do that. Obviously, one option is 64 independent instrumentation amplifiers, but that's expensive ...
1
vote
2answers
141 views

Which method is better for liquid crystal overdriving?

Recently, I started to design a LC (Liquid Crystal) shutter glass. The question is which component should I use. This is the LC shutter I might use: PolarSpeed®-S However, there are a few more ...
0
votes
1answer
41 views

Choosing the bias components of a cascode amplifier

For a two transistor cascode amplifier, how does one determine the base bias resistor ratios? In the design case of a single transistor common emitter, one can use tricks like Ve = Vcc/10 for, from ...
-1
votes
1answer
37 views

how to construct an active high pass filter on breadboard

i am going to have an experiment on active high pass filters and i would like someone to tell me how could i construct / carry the experiment please i don't want be embarrassed. so tell me please ...
0
votes
3answers
40 views

Sample And Hold Adder

I've been playing around with a sample and hold adder circuit. Essentially, I am trying to sample a sine wave with a sample and hold circuit. I want to take that sample and add it back to the sine ...
0
votes
1answer
41 views

Hacking an RC car controller to implement a joystick (PWM)

My RC car controller (transmitter) has only 4 buttons (left wheel forward /backward, same for right) I want to implement a joystick using Arduino. The Arduino will use PWM on the transmitter ...
1
vote
2answers
45 views

Does transconductance (Gm) have 3dB bandwidth [closed]

The voltage gain of an amp is Gm*Zout, the bandwidth of the voltage gain is limited by the Zout as signal freq increases. I wonder whether the Gm also has 3dB bandwidth or not. And If Gm has 3dB ...
0
votes
2answers
39 views

Anti-aliasing filter as notch and lowpass

In order to reach a steep attenuation for an analog antialiasing filter, there are issues if a high Q notch filter is followed by a low order lowpass filter (or vice versa)? The notch resonance could ...
0
votes
0answers
18 views

Ways to improve saturation time in Multiplexers

I'm using max4708 multiplexer (operated as single supply 36V), when i tested the multiplexer- my inputs, for example +32V, +20V get well saturated at 20Khz.Later when i added to the circuit, for the ...
0
votes
2answers
36 views

SPICE Programs worth learning for [closed]

I was wondering what are the professional SPICE programs for simulating analog circuits in the industry now. For example, where the big companies like Atmel simulate their microcontrollers, or a ...
-1
votes
2answers
48 views

Switch on time limiter for a solenoid - will this circuit work?

Here is the problem i have: there is an electromechanical door chime (just a solenoid with a rod inside, which hits one brass pipe when switched on, and, propelled backwards by a spring, another when ...
0
votes
0answers
26 views

multistage transistor amplifier two requirements

for me to build a multi-stage transistor amplifier , what are the requirements that i have to consider ? i come across websites that say they must be DC coupled and i get that , and the second thing ...
-1
votes
1answer
65 views

Lead Acid Battery Voltage rises very quickly

I am working on a charger for the first time. m charging a lead-acid battery (6V) by supplying a voltage of 7-7.2V & 100mA. But the voltage rises from 6.10 to 6.30 in just 5-10 seconds. What ...
0
votes
0answers
30 views

How to reach this frequency while simulating this Colpitts oscillator?

I have designed the circuit with the values that are given in (figur1) and it works fine , the frequency is similar to the theoretical value.. However, the question is to redesign the circuit ...
1
vote
1answer
70 views

How much current will LM317 pass in this circuit?

The formula for the output current of a LM317 is: In this schematic, what will the output current be? simulate this circuit – Schematic created using CircuitLab MY approach: I ...
0
votes
0answers
46 views

DIY ultrasonic cleaner - will it work?

I want to build some simple ultrasonic cleaner and I wonder: is my idea going to work? The plan is: Build a container from metal sheets or just find/buy some container. Buy something like 60W 40 kHz ...
-1
votes
1answer
65 views

History — Analog IC Family Trees — Any references showing evolution? [closed]

Take an ancient and honorable IC, say the 741 opamp, or the 555 timer, or the 193 comparator. My historical memory is faulty, but I believe they were the first of their kind. Designs are always ...
-1
votes
1answer
105 views

Rtd Signal Output to 0-5v? [closed]

I have a constant current source and analog input channel but it seems I can not directly read rtd as resolution needs mv levels. I cannot use circuit so is there any product or solution help me to ...
0
votes
1answer
35 views

Open collector to high-z

Keeping it completely analog, is there a way to high-z an open collector output? An open collector always allows a path to or from a specific voltage potential and this is complicating a rather simple ...
0
votes
1answer
43 views

AD620 simulation Problem

I am doing my FYP in which I am using AD620. I have problem in simulation. Attached is the circuit which i am implementing. Basically I need a gain of 5000. i.e My input should be amplified by 5000 ...
0
votes
1answer
38 views

Power down current

I'm designing a Variable Gain Amplifier (VGA) for a course project. I'm using Cadence CMOS 180nm technology. One of the requirements is to find the power down current through simulation. I searched on ...
0
votes
5answers
73 views

Is it possible to use a potentiometer as a DP3T style control?

I'll try to be specific: I have an audio application that has 3 inputs and 1 output. The classic answer would be to use a DP3T to switch between the inputs. However, I would like to have a ...
2
votes
3answers
168 views

Why should we use LED driver chips instead of much simpler structures?

For example: I have two led driver chips: bcr321u and RT8474AGSP And think they both support to same output voltage and same output current etc. My question is about topological differences of ...
3
votes
3answers
103 views

Digital vs Analog signal for data transfer across boards

I have 1 board that reads data from a sensor, while another board wants to get data from that sensor. Is it better to have an ADC on the first board, then send that data via i2c to the 2nd board? Or ...
0
votes
2answers
61 views

How are conflicts between voltage sources or signals resolved?

I am trying to understand what happens when 2 supplies or voltage signals are tied to together as I come across similar situations where a Totem-pole output is also being pulled-up by a weak pull-up. ...
0
votes
1answer
28 views

Auto switching from bluetooth to aux

I'm building a project where I would have both a bluetooth receiver and an aux in line connected to the same speaker. One way could be to detect the presence of jack inserted in the aux in connector ...
1
vote
1answer
44 views

the voltage resolution for an analog signal with an amplitude

say,i have 16-bit DAQ that can read at a rate of 250kSamples/second. What is the voltage resolution for an analog signal with a 2V amplitude? For what value of signal frequency can I safely digitize ...
1
vote
1answer
36 views

multilevel storage elements

I've been experimenting with three-valued logic (yeah, I know) and have had quite a bit of success by using voltage comparators to implement the combinatorial logic. All 27 1-input gates and many ...