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

learn more… | top users | synonyms

0
votes
2answers
30 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 ...
-1
votes
0answers
39 views

FPGA with integrated operational amplifiers?

Do you know of any FPGA/CPLD chip with embedded op-amps and ADCs? Or maybe another way to amplify weak signals ( <1mV) inside an FPGA, without using external op-amps (simulation using DDA maybe)? ...
6
votes
4answers
307 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 ...
0
votes
2answers
93 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 ...
2
votes
2answers
104 views
+100

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 ...
5
votes
1answer
127 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 ...
-7
votes
0answers
56 views

What's Cowan Modulator?

Please can someone tell me what a cowan modulator is and where i can get more information on it? I have searched every where online and even journal.
0
votes
0answers
41 views

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 ...
0
votes
0answers
61 views

selecting analog design or digital design [closed]

Generally speaking, what are the motivations that people to go with analog or digital design? Which one is harder to specialize? Which one offers more average to specialized designer? In future ...
1
vote
3answers
38 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 ...
9
votes
1answer
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 ...
0
votes
1answer
45 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 ...
5
votes
3answers
370 views

Use Cases for an External ADC

Most Microcontrollers (uC) have an Analog to Digital Converter (ADC) as part of their peripheral set, which is phenomenal as this integrates two components into a single package. These ADCs are ...
2
votes
2answers
219 views

Capacitor/resistor effect on audio signal

I have a pair of 20 years old electrostatic speakers that have an analog first order high-pass filter before the electrostatic panels, so there is a capacitor in the audio signal path. The original ...
0
votes
0answers
23 views

Compute analog signals as functions of two signals

I would like to hear your opinion with respect to the following architecture for a supposedly easy task. I need to “compute” the value of two voltages depending on two signals. Details: I need to ...
0
votes
3answers
71 views

Joystick interface

I need some advice for my project. I would like to create a joystick interface for my old Amiga computer. I have an analog joy with HID USB interface, I can read the position datas in digital format. ...
0
votes
1answer
49 views

sine wave generator circuit with OPA604 and LM3900

I am trying to generate a sine wave signal. I am following this guide http://www.ti.com/lit/ml/sloa087/sloa087.pdf from TI. The thing is I cannot find the IC that they are using (TLV2471) and I only ...
22
votes
5answers
2k views

Is analog signal arithmetic faster than digital one?

Would it be theoretically possible to speed up modern processors if one would use analog signal arithmetic (at the cost of accuracy and precision) instead of digital FPUs (CPU -> DAC -> analog FPU -> ...
0
votes
0answers
26 views

MEMS Accelerometer/Gyro 3-axis Conversion question

I'm not too familiar with the digital mems signal to analog conversion using a microcontroller. Can you still retain the signal intensity due to rotation of the gyro, or is the output always going to ...
0
votes
1answer
38 views

Arduino analog input higher than reference but lower than 5v [duplicate]

I'm going to use a very precise potentiometer that can measure angles from 0 to 3600 degrees (10 rounds), but I only need the first 180 degrees or so in this project and I need it to be more precise ...
1
vote
2answers
62 views

Taking the edge/ring off a clock signal with an RC circuit?

I'm designing a board for a hobby project where I am using a lattice machxo2 cpld as a system interconnect. The cpld needs to be clocked at 80-100MHz, and because I sprung for a cheaper cpld, it has ...
0
votes
1answer
59 views

How to measure power/energy with analog circuit?

I would like to measure either power (running average, for example exponential average with a certain time constant) or energy (power integrated over time) with an analog circuit. The setup I have ...
3
votes
2answers
87 views

Verilog data input

Hello I am relatively new to verilog and need help on part of a project am working on. I need someone to guide me as to how you read data from an analog device. I bought an analog temperature sensor ...
0
votes
4answers
85 views

Can an opto-isolated input be analog?

Title says it all: can an opto-isolated input be analog or are they intrinsically digital? Why: I am looking to purchase a relay control board and am deciding between a few options. Here is my ...
0
votes
1answer
46 views

Current Sensing with ACS712 on Beaglebone Black

I am planning to use my BBB to perform some current sensing and was wanting to use the ACS712 chip. The chip operates off of 5V, but the analog inputs of the BBB have a max of 1.8V. How can I wire ...
1
vote
2answers
64 views

Using Op-Amp for attenuation to give input to sound card

I know there is lot of question asked about this topic before, I read them but there are some limitation on those circuits which make me ask this one. I want to do analysis of main ...
1
vote
0answers
37 views

Digital to analoge voltage regulator

I am a complete beginner on electronics. I am trying to make device to control the voltage output according to a digital input. So basically what I need to make is to continuously increase the ...
0
votes
1answer
84 views

Determine best op-amp order for PCB design

In my current design, I use 3 op-amps from a quad package (DIL 14). One is not used. For the design, it doesn't matter which op-amp is used when, since they should be identical. For example, I'm ...
2
votes
2answers
75 views

Pass DC through (passive) highpass filter?

Background: I'm a student, working on my final year project. I am designing a front end for a software defined radio. We have an IF frequency at 36Mz (and a BW ~8MHz). We are bandpass sampling this ...
2
votes
2answers
118 views

Analog oscilloscope triggers

I have recently received an old 70's era Tektronix 465b dual trace oscilloscope. Unfortunately I have close to no clue how to use it. I understand the concept of triggering but this scope has two ...
0
votes
0answers
45 views

pin connection added

I am trying to communicate 24 hall sensor via arduino & 8:1 Mux . I am using CD74HCt4051E 8:1 multiplexer. Instead of hall sensor i have used potentiometer 24 nos and connected to MUX IC devide ...
2
votes
3answers
63 views

Linear Phase Response

In many cases it is demanded that the filter has a linear phase response. (like in case of FIR ). Why linear is so important? Why not constant or anything else(any other shape)?
0
votes
2answers
144 views

How to get the square wave output at Photodiode

LED flashing light captured by camera Displayed image detected by Photodiode I have a 2V p-p square wave signal of 500µs. This signal drives ...
1
vote
1answer
94 views

Finiding composition of circuit from frequency response and bode plot

I have the following bode plot and nyquist plot result of an unknown DUT (it is a filter I asume!). I wonder what kind of arrangement it has in terms of being a series or parallel RC or RLC ...
1
vote
0answers
106 views

PNP BJT as a 'switchable' flyback diode?

I have an automotive ignition coil which I'm using as an ignition source for a project I'm working on. During normal operation, the primary coil current will be interrupted periodically to induce ...
0
votes
3answers
95 views

How to halve a frequency with analog circuitry while preserving signal integrity?

The question is simple, the answer I'm not sure... How could I pick up an analog audio signal, divide it's frequency by 2 (one octave lower) and send it back on it's way? I could do this by sampling ...
1
vote
0answers
77 views

How to learn circuit design if I already know some circuit theory [closed]

I'm a recently graduated electrical engineer, but my curriculum never focused on electronics, besides the standard introductory level courses. I specialized in telecommunications and I mostly work on ...
0
votes
1answer
32 views

Output Pin of Burleigh PZ-150 Amplifier Driver Analog High-Voltage Power Supply Unit

I have found a Burleigh PZ-150F Analog Amplifier Driver. However I could not locate the manual. What connector cables are compatible with the output port of this amplifier? It seems there are two male ...
2
votes
2answers
164 views

+5v and -5v power

I'm building an analog switching circuit which is controlled by an arduino. My circuit requires 25 4066 quad-analog switches. To get the required analog voltage range for the switched inputs, I ...
0
votes
1answer
44 views

How can I use the presence or non-presence of an 120VAC input to actively discharge a bias power rail?

I'm designing a power supply that has an input of 100VAC to 300VAC. On the primary side on the main transformer, I have a 15V rail to power the control chip (a FAN6920) and a gate drive chip (a ...
0
votes
0answers
117 views

ATTiny85. How do I use the reset pin as an analog input or digital output?

According to this datasheet, the ATTiny85 has 6 I/O pins if we include the reset pin. I used five of them to charlieplex 18 LEDs and I need another one to use as analog input. Would it be possible to ...
2
votes
2answers
120 views

Designing a stiff voltage source using an emitter follower

simulate this circuit – Schematic created using CircuitLab I am new to electronics, and I am trying to do Exercise 2.2, page 67 of The Art of Electronics. Use a follower with base ...
0
votes
4answers
141 views

Simplest possible way of latching the voltage peak?

I have an input signal like this. I wish to display the highest voltage for a period of time with LED. So I need to retain the highest voltage until the next new highest voltage comes. I tried D ...
1
vote
2answers
84 views

Converting mark space ratio to DC

I have a pulse which varies between 500 Hz to 100 kHz where the quantity I need is the mark space ratio, I'm not interested in the frequency here although it must affect the design. What I've come up ...
1
vote
1answer
60 views

Analog PWM generator from 0%

I have to prepare easy analog PWM regulator which can operate from 0% (0V). I know that one 555 can't do that... Do you know any circuit that can handle that?
1
vote
1answer
78 views

Compromise needed combining virtual grounds

This is a long story for which I hope my proposed solution to a problem I've created will be a stable one. But op amps can surprise you, so let me explain. The circuit is large and complex, so I'd ...
0
votes
0answers
25 views

Flex sensors and pinoccio Interfacing

So I'm planning to interface these flex sensors https://www.sparkfun.com/products/10264 with a Pinoccio: https://pinocc.io/ Since the onboard ADC accept voltages till 1.6 volt and i need to ...
1
vote
2answers
131 views

Why does an op amp need to be powered before applying the input signal?

I was taught that a power supply needs to be applied to an op amp before an input signal. I understand that doing that in the wrong order fries the chip, but why?
0
votes
1answer
103 views

Direct interfacing of analog MEMS microphone to microcontroller ADC

I would like to sample the output of an analog MEMS microphone with an ADC embedded in a uC, sampling rate up to 1MHz. I don't care too much about signal quality (as I'm more interested in ambient ...
0
votes
5answers
185 views

Simplest analog circuit to compare two song signals?

I am trying to build a simple analog circuit that compares how similar two song signals are. One signal is the song sung by me, for example, and the other signal is the reference song signal. Since ...