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

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How to measure current with an analog multimeter?

I need measuring the current through a dc motor with an analog multimeter, but I don't know how to select the correct function to that. The meter is a FT-360TR. I know it can measure currents of ...
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0answers
18 views

Accelerometer output transmitted via Bluetooth

I have a project in which I want to send the output of a standard(piezoelectric with analog output) accelerometer via Bluetooth to other devices. The sample rate of the signal that interests me is up ...
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1answer
41 views

strange temporary shorting

I was testing a board of mine. I was testing the boards for any shorts. I have 3 Voltage planes 12V,5V and 3.3V. I was using a multimeter in the connectivity/short mode to test if the Vcc and GND are ...
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2answers
50 views

How does a synchronous motor know to increase current when the mechanical load is increased?

Consider a very simple singe phase synchronous motor, such as the one shown in figure 1. This motor will not be self starting, but if an AC voltage is applied and the permanent magnet is given an ...
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1answer
98 views

Ohmmeter not working as expected

I am trying to build a simple ohmmeter by creating a voltage divider and then using an analog pin on a PIC18F2550 to read the output voltage and determine the ohmic value of one of the resistors. I ...
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1answer
65 views

Sigma Delta ADC for “quasi-DC” signals

I am designing a \$\Sigma\Delta\$ ADC. Most of the high level specs are already set: order = 2 1 bit quantizer OSR = 256 (or 512 if needed) signal band: 100/200Hz We expect some 16bit output, i.e. ...
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44 views

johnson counter sine wave resistor network

I saw one schematic which uses an 8-bit shift reg to produce a sine wave with a resistor network. I am guessing the resistors will be voltage dividers, but how are the values calculated? I tried to ...
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1answer
63 views

Log amp with vacuum tubes

is there a way to build a log amplifier using vacuum tubes? I would like to have a VU meter (with the proper log response), but do not want to use solid state components. The output would be to a ...
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1answer
71 views

Multiplexing analog signal

I want to read 4 analog signals (coming from 4 pH sensor, generally said 16HZ freq.) With one buffer op-amp circuit going into a single ADC channel. Is it possible to achieve this using analog MUX ...
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1answer
55 views

alternate astable multi vibrator design

Is there any alternate way to design Astable Multi Vibrator with use of only Resistor & capacitor ? ( avoid 555 Timer ) , avoid BJT if possible. my aim to make most compact Astable MV.
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35 views

electret microphone dynamic impedence

how much is the dynamic impedance/resistance seen from a electret microphone? I am trying to design a microphone preamp and need to know seen resistance in small signal from the signal source ...
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2answers
51 views

Replacing a tactile switch with an ultrasonic ranger

I'd like to have a switch activated when something gets near it. Today it's just a pushbutton, that's active as long as it's depressed. I'm going to use an analog ultrasonic ranger, using its analog ...
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27 views

Using the thermal expansion as the driving mechanism for an analog switch

I'm not sure if this is the right place for this question or if physics might be better suited... I've been trying to solve for an analog switch engaging when an element reaches a temperature of ...
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2answers
56 views

What is The Difference Between PAM And ASK

In Digital Communication can We use PAM in place of ASK The Diagram is Given as The Book Later Talks about Symbols. I Don't Understand, in PAM we don't have specific signal as input like in ASK ...
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1answer
28 views

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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2answers
46 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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1answer
18 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
98 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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13 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
699 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
145 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
47 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
28 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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272 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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50 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
64 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 ...
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1answer
33 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
61 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
60 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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1answer
40 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
66 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
32 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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105 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
73 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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1answer
43 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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2answers
79 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
58 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
52 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
97 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
48 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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31 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
102 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 ...
0
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1answer
74 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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0answers
74 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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0answers
45 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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2answers
138 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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2answers
277 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
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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
276 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 ...