Questions tagged [analog]

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

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39 views

How does this circuit ananlyze?how does this buzzer work?

simulate this circuit – Schematic created using CircuitLab
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2answers
62 views

Can we use both FFT and PSD to obtain a random signal's frequency domain representation?

I always encounter random noise frequency domain representation as PSD(not FFT), something like in the below plot: Without diving into math too much, practically speaking can we always use FFT ...
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32 views

Practical examples to determinism and periodicity of analog signals?

What I understand from deterministic signal is that we can define it as a function. Same thing is valid for a periodic signal. But periodicity and determinism are are treated as independent categories ...
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50 views

Stable PWM during Control Voltage Loss

I have a system as below, controller runs at 200 kHz. I have a requirement of interruption at the controller voltage PWM signal for 5 μs, still during that I need to have the PWM running. So I was ...
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86 views

How to limit current while almost keeping voltage same

I am supposed to design a power supply to a project. I have 3 alternative power supply designs for this purpose. However, one of them sucks huge current while giving enough current. My design is given ...
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50 views

How to find the RMS value of a sine wave with DC offset and retain the negative sign

I'm trying to build a Quadrature setup where an input signal is mixed with a reference signal that is in-phase and another one out-of-phase by 90deg. The idea is to extract the real and imaginary ...
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4answers
59 views

Momentary Over-Excitation Voltage Circuit

I want to control an electromagnetic brake (fail-safe brake) used along with servo motor. Microcontroller will control the trigger signal for the electromagnet coil. Electromagnet Requirements: ...
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1answer
35 views

feedback loop component dc converter

Consider the schematics below, the switching frequency is 250KHz, So, The cross over frequency be 250/5 = 50KHz. My ADC is able to sample at 1MS/s which is good as from the SNR perspective.Now, the ...
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1answer
48 views

Colpitts oscillator: how to reduce amplitude thermal drift?

I have built this circuit, supply ±12V: I am using a LM6172 amplifier. I have found the transfer function of the filter involved: \$H(j\omega)=\frac{1}{1 + \frac{R_3}{R_1} - L\omega^2(C_2+C_1\frac{...
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1answer
45 views

Lithium Ion Battery Charger and Power Path Management IC

I am to analog electronics. I am building a circuit that has a lithium ion battery. I understand the importance battery charger in battery management. My question is how does a designer set ...
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1answer
50 views

SENT (Single edge nibble transmission) signal to analog signal conversion

I'm currently getting a SENT signal output feedback(IC MLX90367 used in the simple actuator) from an actuator. For closed loop control, I have to feed this signal back to the motor controller. ...
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2answers
53 views

Dual slope edge detection for a phototransistor

I want to detect sudden changes in light level using a phototransistor. The goal is to transmit information optically using the timing of the transitions, ideally using an LCD screen. LCD transitions ...
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1answer
39 views

Logic gates for relay coils analogic control signals

I have 2 external signals arriving to my board, A and C. B is generated inverting A. They 3 will be used for generating 3 switch control signals: A', B', C' at every point (there will be 8x3 24 switch)...
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1answer
35 views

Parasitic insensitive switched capacitor circuit

I'm trying to simulate the parasitic insensitive switched capacitor circuit shown here: I am using cadence virtuoso. My input is a sine wave of 1 V amplitude, 0 DC and 1 kHz frequency. I am using ...
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1answer
46 views

PIC12F675 ADC not working properly

I wrote a code that takes an analog input from a potentiometer and controls the frequency of a clock pulse. So, the idea is to increase the frequency when I increase the pot and decrease the frequency ...
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2answers
120 views

LED to switch ON when an analog signal is outside the range of -10V to +10V

I would like to make a simple circuit to detect when an analog signal goes either above +10V or below -10V, and switch on a single LED if either of these cases occur. I have available only +12V and -...
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52 views

How to get analog input using PIC12F675

everyone. I'm new to embedded systems and I want to program a PIC12F675 for a project. I have most of the code figured, and there is only one thing left. It's the analog input. I tried some tutorials,...
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3answers
92 views

Colpitts oscillator : having trouble while respecting Barkhausen criterion, is this criterion insufficient there?

I'm trying to simulate a Colpitts oscillator. I've determined transfer function of the low-pass filter of this circuit: I reached this expression: \$H(j\omega)=\frac{1}{1-LC_2\omega^2+jR_3\omega(C_2+...
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45 views

Microphone input buffer circuit not behaving as in simulation

I have designed a circuit to interface the SPW2430HR5H-B microphone into a dsPIC33 ADC pin. The circuit has an active LPF and uses the AC coupling capacitor as a HPF to get an output on the frequency ...
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22 views

Difference between cutoff and subthreshold region of nmosfet?

I understand that some current does flow from drain to source when Vgs is below vth and Vds is greater than zero. But why this has a different name?(and a different region in Cadence virtuoso tool) ...
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18 views

Where do the electrons come from in nmos channel formation? [duplicate]

For a NMOS, when gate potential is increased from 0 to say 0.1V, the holes in substrate feel repulsion and moves away leaving negative ions behind. But what exactly happens when the gate potential ...
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52 views

Designing a 4053 IC robotic control circuit for interfacing with Sabertooth motor controller?

I am designing a control circuit for a robot and was recommended to use a 4053 IC to achieve analogue multiplexing. PROBLEM The Sabertooth 2x60 motor controller I am using is running in analog ...
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1answer
88 views

How to avoid signal interference between 5 volt analog video signal and 415 volt servomotor and drivers, when working nearby

I am using a 5V borescope analog camera (Sony CCD, PAL/NTSC) for visualization purposes. This camera has a 20 meter 4 core wire, which transmits power and video signal to and from the camera. Along ...
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2answers
71 views

Can I connect Analog and Digital Voltage Source together?

Is it bad if I connect the A_VDD and D_VDD Pins together if I want to use the same voltage? Or maybe I should ask: Why can I hook up different voltages other than galvanic decoupling? This is the IC I ...
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38 views

Emulating guitar pickup loading effects with a floating gyrator?

I'm looking to construct a high impedance buffer which emulates the loading effects of an electric guitar connected to a nonlinear, low input impedance amplifier such as the Dallas Rangemaster (...
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3answers
55 views

Quad voltage controlled resistance

In order to have a quad volume control, I thought of having a single log pot between a DC negative source and 4 gates of 4 matched JFET's as shown above. We're talking audio here, I haven't calculate ...
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1answer
49 views

Advise on developing (by self) in analog circuit design field [closed]

I am a fresh graduate specialized in analog design and would like to work for an industry. For sure, there are opportunities, however, most of the industries look only for the (industry) experienced ...
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1answer
81 views

How to generate a controlled frequency sine wave using a microcontroller like PIC18F4550?

I'm designing a phonic wheel emulator. I have a PIC18F4550 and the following power supplies: +5V, -5V, 12V. I need to geneate a sine waves from frequencies near 500Hz up to approximately 8kHz. The ...
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1answer
26 views

Arduino mega 2560 Analog max reference voltage

Each time I power up the Arduino, the max reference voltage which is represented by 1023 changes. I observed this by measuring the voltage from the Aref pin each time. Is there any internal function ...
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57 views

How to find the right (external) ADC for an Arduino project?

there is a specific project I am trying to tackle using an Arduino, but I'm fairly new to this topic, which is why I would appreciate your help on choosing the right components and overall circuit. I ...
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1answer
51 views

When using mA on analog devices, does the other wire go to 0V or Earth?

On the Schneider analog input module (link) we have IC, IV, IS, 0V and Earth terminals for a single channel. I've seen people connecting the signal wire from a transducer to the IC terminal and the ...
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1answer
25 views

Pressure sensor for breathing

Could anyone suggest the type of pressure sensor I need to measure human breath? When someone blows into the device I want to measure them blowing in and also sucking out. Could this be done with ...
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2answers
45 views

Assign one audio input to multiple outputs

I've been interested in electronics for couple of months now so my knowledge is still very limited. I like microcontrollers so I'm trying to include them in my projects. I'm trying to build a similar ...
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62 views

Avoiding signal interference in a cable that carries video signal and sensor signal

I am using a 6 core shielded cable. In this 3 wires are used for a sensor and 3+1(shield) is used for a analog camera. All the cores take DC supply. Sensor(3 wires) (+)24 volt supply, (-)minus, ...
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1answer
40 views

How to select resistance to cancel offset output voltage due to bias current?

Consider the figure above how Rcomp was choosen. I know for simpler circuits like inverting amplifier and ideal integrator how Rcomp was calculated but following same procedure (that's using ...
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1answer
51 views

What is topology of feedback for circuit?

I am confused between Voltage Shunt and Current Shunt Also mention why R2 shouldn't be considered as feedback as it is emitter degeneration resistance Consider the above circuit why can't I consider ...
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1answer
77 views

How to proove if any circuit have negative feedback?

Queries regarding this circuit I am able to say that this circuit has negative feedback but my procedure is disorganized I want a step wise procedure to identify the polarity of feedback In this ...
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3answers
91 views

How to find input impedance of this OPAMP circuit?

Assume OPAMP to be ideal with infinite gain (a) and infinite input impedance I am clearly able to see that the input impedance of this circuit is R1 (correct me if I am wrong) but I am unable too ...
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1answer
26 views

Common ground b/w power supplies and analog pin for microcontroller

Referring to the schematic below, is it best practice to have the 5 V supply on the right powering the MC (arduino-esque microcontroller) share a common ground with the 24 V supply ? The 24 V supply ...
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1answer
36 views

2-time constant (On + decay) timer circuit

Required is a timer circuit to switch on an LED with 2 time constants, when a switch is depressed as follows: when switch is closed, light an LED 10 ~ 20mA when switch is opened again, keep the LED ...
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0answers
42 views

Improving effciency in medical implant with load switching

I'm trying to design and simulate the Q-modulation technique for a body implant. The technique involves two loops: one outside the body, with resonating LC tank producing a big voltage. Another loop ...
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1answer
63 views

36:6 analog multiplexor?

I'm trying to connect 36 analog voltage sensors to the 6 analog pins of an Arduino Uno and cannot figure out the simplest way to go about it, given that I need to be able to accurately read a voltage ...
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1answer
67 views

Detecting “quick falls” in signal

I am conditioning the input of a slowly drifting analog input sensor. The sensor is a phototransistor that will sink a small amount of current when "dark" and 50x more current when "bright," but the ...
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1answer
39 views

Earbud wire color shielding is red/white and yellow/black, which are the grounds?

All wires are white metal, no copper, and they run side-by side and not one inside the other, ground. I'm trying to - well, will - hack my laptop via the headphone jack (yuck) into a Yamaha YAS-71 ...
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1answer
39 views

Can the ADS1118 ADC converter accurately read a voltage close to GND?

1. About the ADS1118 ADC converter I'm using the ADS1118 ADC converter from Texas instruments to measure a voltage. You can find the datasheet here: http://www.ti....
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4answers
119 views

Why is frequency of a sine signal is equal to its “rate of change of phase”?

I want to learn more about PLL but I'm stuck with the concept of "rate of change of phase" which is said that is equal to frequency. At the moment I'm very ignorant at the topic so I need to ...
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2answers
55 views

Getting a specific voltage output depending on the difference of two voltages

Can someone please help me come up with a circuit with the following specification? I need to find out the difference of two voltages (can be done using an op-amp). Then, if the difference is negative,...
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3answers
32 views

Why is there a negative value on the scada when the analog input wire is disconnected from a field instrument?

I'm an apprentice electrician at an fmcg company. I've been seeing a trend recently, at the plant, where the scada actually reads a negative value instead of zero when a field device such as a ...
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0answers
54 views

1.5 bit pipeline ADC

How do we combine bits obtained from different stages of 1.5 bit pipeline ADC. Can it be generalised for k bit pipeline ADC ? each stage has three region - 00 , 01 ,11 in 1.5 bit pipeline adc
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1answer
50 views

Low pass to high pass filter conversion

Ripples from Mutable Instruments (open hardware) is a low pass 4th order filter. The schematic is found here https://mutable-instruments.net/modules/ripples/downloads/ripples_v40.pdf Can I swap ...