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

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49 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
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2answers
69 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 ...
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4answers
72 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 ...
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1answer
22 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 ...
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2answers
52 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 ...
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0answers
36 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 ...
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31 views

AD8615 short circuit [closed]

I have an OPA AD8615 http://www.analog.com/static/imported-files/data_sheets/AD8615_8616_8618.pdf that i use for a analog signal feedback at 3V3 level. This circuit (AD8615) is powred by a 3V3 PS ...
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1answer
81 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 ...
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2answers
68 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
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2answers
108 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 ...
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0answers
41 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 ...
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2answers
42 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)?
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2answers
136 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 ...
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1answer
78 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 ...
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0answers
97 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 ...
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2answers
63 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 ...
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0answers
73 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
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1answer
30 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
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2answers
162 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 ...
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0answers
7 views

Arduino if else code [migrated]

I have made this If-Then-Else code, but it doesn't work. First I tough only the analog code is wrong, but if I take a digital port, the code doesn't work either. What did I do wrong? ...
0
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1answer
42 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 ...
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0answers
82 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
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2answers
108 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 ...
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4answers
124 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 ...
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2answers
80 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 ...
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1answer
53 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?
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1answer
72 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 ...
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24 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 ...
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2answers
125 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?
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1answer
83 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 ...
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5answers
170 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 ...
0
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1answer
34 views

How do I find the corresponding level of those audio samples?

I am trying to self-study this problem for a future exam. The writings in red are solutions to the question. I have a problem in number part e of the question where they find the corresponding level ...
2
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1answer
124 views

What does lumped element mean?

Can anyone explain me the meaning of lumped element and lumped circuit abstraction in detail. What does lumping or discretizing matter mean?
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104 views

PFET to turn on/off system power

I have a Raspberry PI board connected to some external circuitry, and am using Microchip MCP23008 I2C GPIO expander chips to control external LEDs and motor circuitry. One important part of this ...
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2answers
84 views

Pressure gauge with analog output [closed]

I have a circuit that needs to electrically output a pressure value and display it using analog dial gauge. First I wanted to use regular round ammeters but they don't look like "real" pressure ...
0
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1answer
36 views

Are NTSC and PAL affecting display rate

I understand that the NTSC TV signal is 30hz and PAL is 25hz, but if NTSC and PAL are TV signal standards how could they affect display rate(Hz) for input devices e.g. when you connected and old game ...
3
votes
1answer
83 views

Question related to Cascode Circuit

I am trying to solve the following question related to cascode circuit. Where T5 has Vbe=0.7V I have answered the questions as follows. - Explain how the circuit works? The circuit has a DC ...
2
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5answers
127 views

Calculating output impedance of Vbe multiplier

I am trying to calculate the output impedance of the following Vbe multiplier, simulate this circuit – Schematic created using CircuitLab I have calculated the Vout = 4.2V and now I am ...
2
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1answer
59 views

Free spice Model to simulate integrated circuits design

I am using ltspice and I would like to simulate integrated full custom circuits for educational purpose. I found the NMOS4 and PMOS4 models but there are not enough since there are too ideal there ...
2
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2answers
105 views

General impedance converter

Can anyone give an explanation about general impedance converter? This question might not be specific enough, but I will appreciate if someone could share as much as possible about this circuit.
3
votes
1answer
202 views

Understanding source and return current flow on PCBs

I'm looking for advice and tips related to PCB board layout and signal+ground trace/track routing. I'm designing a 2-layer analog-only PCB that has several I/O signals leading to and from other ...
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0answers
23 views

Precise power metering for small motor

We have a system that contains a DC motor (3 W nominal power, but generally running much lower) powered through an H-bridge from a single cell Li-Ion battery (range approx. 3.0 to 4.2 V). The motor, ...
3
votes
3answers
113 views

Using step-up converter in metering instrument?

I am designing a pressure calibrator (my first Real project), which is supposed to measure from 0-200.00 mmWC (20000 counts) using Silabs C8051F350 (inbuilt 24-bit Sigma delta ADC). Sensor used is a ...
2
votes
2answers
79 views

Input voltage for LM4862 audio amplifier

I just started working on an embedded side project that requires me to pump .wav files through headphones. My main microcontroller is a PIC32, and my audio amplifier is an LM4862. For the DAC ...
0
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3answers
69 views

Turn a load on with a pulse of power, keep on until (NO) button is pressed

I have a device that sends a pulse +12V when access is confirmed. I would like to keep a relay live until a button is pressed to close the circuit. This is used to start up a cars (acc) and allow it ...
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2answers
110 views

Need an optocoupler for getting directly proportional output galvanically isolated from the DC input

I want to use an optocoupler to linearly step down a DC voltage which willy vary from 0V to 400V. That is, I want the output to be directly proportional to the input and I want it to be galvanically ...
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votes
2answers
90 views

Simplest possible oscillator (with some constraints) [closed]

I'm interested in finding an oscillator circuit that meets the following constraints: Runs on 9 volts or less Periodicity 100-1000 Hz or so Non-sinusoidal oscillation No inductors 1 transistor or ...
1
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1answer
86 views

Automotive Sensor - Excessive Ripple Noise

I'm designing an automotive oil temperature sensor based around a 3-wire RTD. This is my analog circuitry: U1 and U2 provide a 1mA bias on the RTD which is measured by U3 and gained up by U4. R5, ...
0
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1answer
105 views

How to eliminate early effect in constant current source

When designing an differential amplifier it is important to have a precise constant current source (which I will abbreviate with CCS). It helps to keep out signal injections from the supply rails. A ...
0
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1answer
60 views

BJT small signal analysis, ignoring current sources

Question for you. Currently 'm in the middle of studying for an analog II exam. I've got the following midband small signal model: When analyzing for midband gain, more specifically VB2/VPi1, the ...