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

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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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25 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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17 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
69 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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10 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 ...
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4answers
653 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
126 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
43 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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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
26 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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22 views

why 5v or 6v analog cmos is general for dc-dc? [closed]

In BCD technology, why is general to use 5v or 6v cmos? What is difference between 5v cmos and 6v cmos when we design dc-dc? Which is better in these days? Do you think operating voltage is getter ...
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2answers
264 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 ...
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47 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 ...
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3answers
45 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 ...
0
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1answer
30 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
52 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 ...
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1answer
49 views

Is there a simple circuit which would behave similarly to a diode, but with a higher cut-in voltage?

I was wondering if there exist any relatively simple circuit which would have an I-V characteristic similar to that of a diode (i.e. exponential but small before the cut-in voltage) but with a higher ...
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39 views

Connect ground of system A to 1v6 of system B?

I have an embedded system powered by a 3.7V LiPo battery that will be connected to an iPod's headphone out cable. The embedded system will perform some DSP on the iPod's audio out signal and use ...
2
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1answer
63 views

How to write a code to create multilevel waveform using arduino

I need to make a 5-level multilevel(staircase) waveform for my major project from an arduino. how can i get 24 V supply form. I tried to change pulse width by PWM using analogWrite(),but it can ...
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1answer
29 views

Question about Audio signal trace layout (TLV320AIC3204)

I am using the TLV320AIC3204 in an audio project. The part is a stereo audio codec from TI. I'm curious about how the traces are to be laid out. With other chips such as the AD1939, you need to ...
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2answers
97 views

Finding inverse of a signal using analog circuits

How do I use an op amp to find inverse of a voltage signal? In other words, my output signal has an amplitude inverse of amplitude of input signal. My solution was to convert the signal to digital ...
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1answer
70 views

How far can I wire a Sensor or an electrical component that it would work?

I had this doubt in my mind. I wanted to know the range till which a sensor could be attached so that it works. Suppose I have a setup, in which my main circuit is in a room and I have a PIR sensor or ...
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Amplitude modulation using mixer SA602AN

-----------EDIT-------------- I solved the problem using a coupled inductor at the output. Now i got a nice am wave. Thanks for your contribution. -----------EDIT END---------- i've got quite ...
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35 views

Two Arduinos Send data via Analog Pin? [migrated]

What I want to do is allow Arduino A to send some constant value to Arduino B. I sense something inherently wrong with my approach, but I cant figure out what it is. So in the diagram below you will ...
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37 views

10V DC Linear power supply

Currently I am using an Allen Bradley Analog output card to get a variable -10VDC to +10VDC output as defined by the PLC program. However the PLC will only supply 100ma with that voltage. The device ...
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72 views

Analog circuit to check if an audio signal is present?

On the project I am working on, I have 3 line-level audio signals, and I need to determine on an arduino if a non-silent signal exists on each line and act appropriately (in my case, "unplugging" a ...
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1answer
54 views

What's the best phone cable for DSL? [closed]

I want to know what cable I should be using to connect my demarc to my DSL modem. When I plug in my DSL modem in the utility room (which is about 20' of wire from the demarc) I get a pathetic 4Mbps ...
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2answers
41 views

How can I convert a flow sensor's pwm output to logic level relay control?

I have a flow sensor with PWM output and I can't replace it with a flow switch due to mechanical restrictions. Is there any simple way to convert the PWM output to a logic / or analog signal and ...
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1answer
90 views

Unexpected dominant pole in active-RC circuit

Consider this active-RC circuit: simulate this circuit – Schematic created using CircuitLab it should exactly realize the RLC high-pass filter with one zero: simulate this circuit ...
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1answer
47 views

How to set modulation depth with modulating a signal with an analog multiplier?

For example, I have an AC signal V1 which I'm modulating with another AC signal V2. When V2=0 the output will be also 0 (since a simplified transfer function of the analog multiplier is V1*V2=W). This ...
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0answers
29 views

safely cutting power to ICs and analog subsystems

I'm developing a wireless sensor node, which will be deployed in very remote locations. I'd like to be able to cut power entirely to some power-hungry ICs or subsystems using a power mosfet with low ...
4
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3answers
94 views

Improve rise-time of NPN current mirror

I'm looking for a way to improve the rise-time of a current mirror. My problem is as follows: I want to interface with an obscure single wire protocol. I'm starting with a digital signal that has a ...
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57 views

RFI on the amplifier due to Wifi

I have a board with a sensitive analog amplifier. This amplifier is optical in nature and it has a gain of 6M times. On the same board there is a Wifi module. Somehow when Wifi is transmitting I see ...
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67 views

How do Dualshock 4 pressure sensitive buttons work?

I'm doing a reverse engineering research about the PlayStation 4 controller. I want to know how do the analog buttons work (the triggers in the bottom, not the analog sticks). I've found a nice ...
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42 views

Oscillations in Master-Slave High Current Source

I am attempting to trouble shoot a circuit and I am a bit stumped. The circuit is high current source (10-20A) based on a master-slave configuration using OPA549 high power op-amps. There is one ...
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102 views

Thevenin Equivalent circuit for T feedback network of inverting ideal op amp

simulate this circuit – Schematic created using CircuitLab I am trying to reduce the T feedback network(R2 R3 R4) into a Thevenin equivalent circuit looking into the network from the v- ...
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256 views

Inverting buffer with op-amps

I know that it's easy to make a unity gain buffer with an op-amp (as a voltage follower): simulate this circuit – Schematic created using CircuitLab I also know that it's easy to make an ...
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3answers
130 views

Are there good free software analog filter design tools? If not, why?

I'm finding myself needing to do a fair bit of analog filter design. Mostly passive LC ladder filters. I honestly don't know much about how to design them by hand, I've been using the Genesys tool. ...
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2answers
219 views

How does this Miniature Solid State Tesla Coil work?

Here are the schematics What is the use of> -Transformer (I assume it is providing higher voltage? and what does it do) -Transistor (Is it common emitter? and what does it do) -LED (What does it ...
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124 views

How to analyze analog circuits with transistors [is this circuit immediately analyzable to anyone]?

I'm not experience in making electronics, but I do have a working knowledge of basic circuit laws and such, but we never covered something with transistors such as this BFO metal detector circuit I've ...
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1answer
46 views

4518 and Arduino

First off, disclaimer; I'm a computer scientist in the progress of my first baby steps in electronics. I'm trying to hookup a 7segment with a 4511, 4518 and an Arduino. The 45-series chips and the ...
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2answers
53 views

Arduino detects voltage on ground

I've been having a hard time finding a solution to this problem. I recently ordered a 5 Volt 2Amp AC to DC switching power supply from adafruit.cc When I connect my Arduino's analog sensor to the ...
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4answers
357 views

Tri-state output to three analogue levels?

Is there a circuit which can transform a tri-state (low, high-Z, high) output to three voltage levels? Ideally, the circuit will use only passives and diodes. Would a simple voltage divider across ...
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2answers
104 views

Class B power amplifier

In this circuit from (Grey,Meyer Analysis and Design of Analog Integrated circuits fifth edition) It is stated that : "In the quiescent condition,\$ V_o = 0\$ and \$V_1 = 0\$ ." What forces V1 and ...
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3answers
204 views

Analog preprocessing circuit (anti-alias/pre-amp) for driving ADC

Background Similarly to what Jeri Ellsworth did in her C64 Bass Guitar hack I am working on an audio-to-midi converter for my bass guitar. I am also planning to use piezo discs as sensors placed ...
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153 views

Properties of transitors used as diodes

Consider the NPN BJT. Normally, if you want to use it as a diode, you short base to collector and treat the emitter as the cathode. But in principle, you could also use the base emitter junction by ...
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Eliminating click/pop from analog switches

I have completed my first working prototype for a digitally controlled FX loop and, while it is quite well (no significant signal loss, fast switching etc.), I still have a nagging issue with it: the ...
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50 views

inverted input for adc

I am using ADC122S625 (Datasheet: http://www.ti.com/lit/ds/symlink/adc122s625.pdf). The ADC has a differential input per channel. My signal is from a RF devide with 3V peak to peak and 1.5V DC ...
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1k views

Why use a 0 ohm resistor? [duplicate]

My customer's schematic uses a 0 ohm resistor for connecting analog(AGND) and digital (DGND). I think it is for testing, current measurement , fuse, jumper, test point etc but is there another ...
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58 views

Single regulator to power mixed signal PCB?

I have a codec (ADC & DAC) with both analog and digital power and ground connections (upper half is analog, lower half is digital). By placing the device package in such a way that all digital ...