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

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Combining two joystick to control motor speed [on hold]

I am looking for circuit connection details and PIC compatible programming to control speed of two DC motors, for example left motor and right motor. I will use two analog Joysticks, one will be ...
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73 views

Analog computer using op-amp [on hold]

I have to design a analog computer using minimum number of op-amps to solve 4A+2B-3(A-C+D)=V equation(here A,B,C,D are inputs and V is the output) I know how to do simple adders but this one ...
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35 views

low pass filter and gain calculation

I am working on a data acquisition system project . I have used SMPS power supply and two pressure sensors(-5V to +5V input) and (0-20mV o/p) my analog circuit consists of one op-amp(OP07) and one ...
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1answer
28 views

Does anyone on here know why a camera's accuracy would drop when you reduce the delay time after the pulses?

I'm using a TSL1401R-LF Linescan Camera that reads in a 1 X 128 array of pixels. Here is the datasheet. When I used 170-microsecond delay the accuracy was pretty high and the camera's outputted values ...
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3answers
26 views

How does the ELPF and XTAL inputs on the ADV7180 recommended circuit work?

I am looking at the recommended circuit for the ADV7180 by Analog Devices and trying to understand some of the reasoning behind the design choices. I realize some of these questions may be a lack of ...
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1answer
109 views

Output type of incremental rotary encoder

I have been trying to choose incremental rotary encoder for speed control of three phase induction motor. My problem is that I am not sure what type of output should I choose. There is following ...
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2answers
108 views

Attiny85, reading analog values from PIN3, reports 654 on idle?

At first, I am not a hardware professional (starter) so be kind please. I try to reuse a DENON operation board of a DVD-player with 9 buttons with a Attiny85 Digispark clone connected to PIN3 (see ...
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2answers
39 views

Optimizing regulator power circuit for low noise?

I am trying to understand the attached circuit. It's an ADP3333ARMZ-3.3-R7 regulator to provide 3.3V to an analog system. My goals is to have a very low noise regulator and power circuitry for a 16 ...
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2answers
67 views

Overvolting a dc motor while keeping power constant

So i have 36v dc motor rated 70A at 2000w (mechanical output power) . I would like to run the system at 48v (same power) because i have a lot of accessories for 48v system ( battery chargers , dc/dc ...
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1answer
58 views

Light dependent resistor (LDR) switched LED-circuit

NOTE! The LDR has a minimum val = 2kOhm and a max. val. = about 5 MOhm Im trying to build this circuit for my radio station. I would appreciate som help. Your general opinion about the ...
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1answer
44 views

How does inductance change with presence of different directional magnetic fields?

If I design a coil driver for a certain application, I assume there is a fixed load right? It may have drive any inductance between an interval but you can not drive any coil, because the driver is ...
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35 views

How to arrange delays in this digital circuit?

I tried to design transistor level analog driver and here is where I stucked! I have four inputs: A, B, C, D and their NOT's. They are coming from a schmitt trigger. simulate this circuit &...
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3answers
254 views

Measuring current - shunt resistor or current transducer or something else

I have to measure current which is sine with 37Hz frequency 1350 mA(DC) + 190 mA(AC). The voltage in circuit is generated using PWM 27V, 600 Hz, PWM dithering adds alternating part of current. I want ...
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1answer
94 views

Choose DAC for audio

I am trying to play music from a PIC microcontroller using a DAC. I have seen other similar questions, but they use parallel interfaces and I am hoping to save pins with SPI as the interface. I saw ...
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4answers
122 views

Simple way to generate a two-level pulse?

I am looking to generate a two-level pulse as follows, where the adjustable parameters are \$V_1\$ and \$V_2\$ between 0 and ~5V, and \$t\$, ~5 to ~50 ms: The trigger pulse length may be anywhere ...
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56 views

Why does the collector current direction remain the same in saturation and active region?

The collector current direction remains same in both active and saturation state where the former puts the base collector junction reverse biased and the latter puts the base collector junction ...
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3answers
591 views

What is T1 in this circuit for 'Mains power failure alarm'? [closed]

I know it is a transformer, but is it a transformer that looks like an IC? Or just a regular step down transformer? (Transformer 12V (1A)). This will be built on a breadboard. Also can I use 1n4007 ...
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1answer
46 views

isolated high voltage H-bridge

I want to control on isolated H bridge that powered with 100V and can drive up to 0.5A low frequency 3HZ but Pulse width of 200uS . the response times should be is US so i cant use Solid State Relay ...
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3answers
219 views

Is it reliable to use Li-ion battery + LDO for analog circuits and 3.3v digital circuits?

I'm doing a project measuring ambient light with 'photodiode + op-amp + ADC + cortex-M0+.' For a while, I used stable DC source for providing 3.3v to every components. The next milestone is making ...
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1answer
127 views

Solution for adding around 60V dc-offset on digital signal(0 and 5v) of 10MHz frequency

I thought of using Opamp adder for this but the problem is high offset value which can saturate the Opamp. Can you please suggest some other solution ?
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136 views

Why is saturation region called so in BJT characteristics?

I understand base-collector (current) linear relationship is lost in saturation region and collector current will be lesser than \$ \beta * Ib \$ . Hence,at max, we can call such a region as non-...
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79 views

eliminating audio hum

I'm working on a circuit that feeds a microphone into the ADC of the STM32F4 Discovery and then outputs that exact signal out of the microcontroller's DAC and then to a headphone jack. I am able to ...
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46 views

Syntax Errors in VHDL-AMS

The following code results in the error under determined model and the simulation breaks off. How should I remove the error. I have coded in Hamster Vhdl. I would appreciate any help. ...
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2answers
68 views

Composite video (one channel) to RF input of an old CRT TV [closed]

I want to convert HDMI signal to RF signal(antenna input) for my old TV (AV is input broken). If I connect Composite video (one channel) to RF input of an old CRT TV, does it work? Audio to TV is not ...
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1answer
32 views

Channel-Loss and Channel-Insertion-Loss

Read many time about Channel-Loss and Channel-Insertion-Loss, but confused that, is that same thing or opposite? Which has +ve or -ve values in dB? In reference to equalization of USB3.1.
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32 views

Beaglebone PRU PWM to Audio Signal

I was wondering if its possible to convert the high frequency PWM output from a Beaglebone Green's PRU into an analog audio signal. I was looking at building a low pass filter and I was wondering if ...
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1answer
37 views

Need for inverter chain to decrease rise and fall time in a comparator

I was designing a MOS comparator for my laboratory and I could not understand how an inverter chain helps in increases the slew rate across the load capacitor. And why an inverter chain ? why cant a ...
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2answers
72 views

What causes the common mode gain in MOS differential amplifier

I went through many of the past questions in this forum and also a lot of other sites but none answered my question, so I made up my mind to post it here. What exactly causes the common mode signal ...
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4answers
111 views

About using a crystal as notch filter

I am looking to create a high q passive notch filter using a crystal. I am not very familiar with crystals, hoping that someone who's had a similar experience can enlighten. I know crystals are mostly ...
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53 views

Peculiar voltage spikes in triangular waveform generator circuit

I recently made a triangular waveform generator circuit using LM324 op amp. But the output of the generator had some sort of periodic spikes in it. However I was able to suppress the spikes by ...
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4answers
82 views

Advantages of filtering signals using analog or digital methods?

In my understanding, it seems that there are, broadly speaking, two primary ways in which signals are filtered for analysis by computers, which are software-side filters and hardware-side filters (...
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39 views

question on “Intercom” circuit I am planing to build

I am using Voice Record Module to save messages and then play them to one from selected outputs ...some kind of weird intercom system. My OA is LM386 [can only do 2 links but I'll post image relevant ...
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44 views

Measuring power with a microcontroller [duplicate]

I'm doing a project to control devices with WiFi. I'm using an NXP (Freescale) MKE02Z and a WiFi module (ESP8266). I'd like to have a measurement of the power of the device that I'm controlling, a TV, ...
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1answer
50 views

Analytic solution of a Graetz bridge rectifier with inductive filter

how could I solve the following circuit? In particular I would find the analytic expression of current on inductor. I tried to solve the differential equation (hps: S1 and S4 on): $$L \cdot \frac{...
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24 views

References on exercises in Analog circuits and Digital Circuits

Can you suggest me exercises' books (preferably with detailed solutions) on Analog circuits and Digital circuits as covered in Sedra and Smith's? I need as many exercises to practice to ace this ...
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4answers
104 views

Interfacing Analog signal to FPGA?

Okey, let's try this again. The board I am working with is the Smartfusion2 (M2S010-FG484 package) Starter Kit. Link-> here. My main question is If I can interface an analog signal to a pin of the ...
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29 views

ECG Signal Measurement using Plessey PS25201

The above said sensor measures the change in the electric field. Data sheet link : Click here When I measure the output from the sensors directly on the CRO with finger placed on the sensor; the ...
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4answers
126 views

Methods for converting PWM to +/- 10v Signal

Suppose we have a PWM signal which controls the speed of a motor and a digital pin which specifies which direction a motor is travelling in, how can we convert these signals into 1 +/- 10V signal ...
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1answer
42 views

Integrating Gefran Linear Potentiometer PY1 with Beaglebone Black

simulate this circuit – Schematic created using CircuitLab I want to connect one Gefran Linear Potentiometer with Beaglebone Black for displacement measurement purpose. The signal conditioner ...
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2answers
78 views

what is the maximum output voltage from an opamp in general case?

In general, what is the output voltage that an amplifier (not rail-to-rail output type) can provide,if it is supplied for example Vdd=+24V and Vee=-24V which is the maximum value I can get "for sure" ...
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1answer
28 views

Calculate the parallel value of resistors at base of common emitter amplifier

I don't know if questions can be asked like this here but if they can I want this question. In an exam paper I saw a question to determine the parallel value of the R1 and R2 resistors in the image ...
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61 views

Gain vs Output Impedence

I am currently trying to improve my understanding of analogue IC design and my textbook kind of brushes over this problem. It is made quite clear that a low output impedance is desired so that the ...
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3answers
56 views

Linear Rise exponential fall pulse generator

For a neutrino detector related experiment, I need to design a circuit which generates the pulse similar to the detector. This is required to test the front end electronics. Here are my final goals: ...
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71 views

Voltage proportional comparison (division?)

I'm looking for a circuit that produces an output voltage which represents the voltage between A-B compared to B-C here. IE if AB is 10V and BC is 1V, the output is 10V, and if AB is 10V and BC is 2V ...
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337 views

Unexpected Sensor Output Voltage Rise

I'm using a Shinyei PPD-60PV particulate sensor in a product and I've noticed something very odd in testing, and I don't know how to explain it. It's connected to a WildFire board by way of cabling to ...
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1answer
41 views

Design of the two stage amplifier with p-type input

I have to design the two stage amplifier with p-type input (p-type diff pair), the schematic bellow: However, mostly tutorials discuss the same architecture but with n-type input. My main ...
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59 views

Analog signal vs. Alternating current

I am seeing that both of the analog signal and alternating current is represented by the same graph: As far as I think I know, an alternating current travels back and forth with gradual changes in ...
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1answer
46 views

Safety considerations when using LED and a comparator

I want to make a simple circuit, it uses two comparators to drive two LEDs, it should turn the LED (green) if the voltage is higher than let's say +2.5V. If is lower then turn the first one off and on ...
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64 views

I/O card couples analogue ground to 0V - how can I work around this?

I'm building a system that has to measure analogue voltages accurately. This system is being tested using PC-based test equipment that has an expansion card in it generating both digital and analogue ...
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27 views

Stamp Errors in layout

I am working on layout. I have two power supplies. For this when I took a via from Metal1 to n well I got no issues. But when i consider another via from Metal1 to n well, I am getting the following ...