# All Questions

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6 views

### Does DiSEqC require a DC bias?

The DiSEqC (Di[gital] S[attelite] Eq[uipment] C[ontrol] specification (bus_spec.pdf within https://www.eutelsat.com/files/PDF/DiSEqC-documentation.zip) describes a tone-based serial data bus that can ...
9 views

### Spark plug trigger with time delay

I'm currently working on a personal project where, a part of it, is having a spark plug discharge with a time delay after a signal is sent. Below is the schematic I've come up with so far but I'm not ...
17 views

### Transistor activation / deactivation voltage in

The capacitor was allowed to discharge completely when the transistor was activated with the 3.4 V. The capacitor is allowed to charge again when the conduction from the 5 V line through the ...
12 views

### Effect of electrical arcing on the system voltage

What will be the effect of Electrical arcing (between phases or between phase and neutral) in a 415V three phase system in the downstream voltage... Will it just act as a load ( let's say the arcing ...
25 views

### how to read this relay diagram

I am a little confused on how this W171Dip-7 relay works. I know 2 is pos 5v and 6 is neg 5v. Looks like the signal from 1/14 will go to 8 / 7 when closed. But i cant tell if 13 is tied to 14 or ...
20 views

### Finding a minimal cost function from a Karnaugh Map

Below is a problem I made up and did. Is my solution wrong? Problem: Attached is following map for the function $f$. We want a minimal cost expression using only and, or and not gates. The cost ...
44 views

### How small could Z80 microprocessor made with modern transistors?

If an 8,500 transistor Z80 microprocessor were manfactured using 7nm transistors rather than 1970s era 6µm, how small would it be?
27 views

### Help identifying a photodiode pre-amp PCB

Recently I found this PCB in a electronics junk bin. It's said that it's a photodiode preamp, but I was not able to find the datasheet or any information about the board. Since the PCB looks neatly ...
16 views

### FIFO Clock Setup for CMOS Detector

When attempting to construct a miniature laser beam profiler with the Omnivision OV7740 CMOS detector and an Arduino Due, I am running into some problems with FIFO reading/writing. From the datasheet, ...
27 views

### How to make a 5v to 8v boost converter

I haven't taken an electrical engineering class for about 2 years now and never thought I would need to use it again. Now I need to build a 5V to 8V boost converter and I need help. I have done hours ...
22 views

### Op Amp voltage output without source connection

How do I go about calculating the voltage output for an operational amplifier when the only connection to the the voltage source is through the operational amplifier itself? For example, the diagram ...
61 views

### How can I possibly get a 9600Hz square wave, for a serial baud rate?

I'm trying to create parallel to RS-232 serial converter using standard logic (serial transmitter only, no serial receive functionality). To get the clock signal my idea was to get a 7.3728MHz ...
60 views

### What the purpose of a diode in parallel with a power switch

I've come across a circuit that has a diode in parallel with a power switch that's controlling a BLDC motor circuit. I was told that it's a flyback diode to prevent voltage spikes from an inductive ...
22 views

### Gain margin and phase margin in Nyquist plots

Finding gain and phase margins from Nyquist plots is basically finding the margin of change in gain and phase beyond which the plot encircles -1, respectively, with the assumption that the Nyquist ...
51 views

### How Can I solve this Question?

One of my friends sent me this question but I have never seen anything like that, anyone knows what is it or how can I solve it? Question asks: what's the value of alpha and calculate the power of ...
23 views

### Getting trigger signal for 555 timer from elevator button

I want to turn a load like light on for a certain time when one of elevator buttons pressed say button 1 and while the button pressed the load should be on. In the figure below circuit 1 describe how ...
33 views

### Phase difference between resistor and inductor voltage in an RL AC circuit

In my textbook, it is given that $\mathcal {E} = -L\frac{\Delta I}{\Delta t}$. The graph of resistor voltage ($V_R$) and inductor voltage ($V_L$) in a series RL AC circuit is given similar to ...
25 views

### HX711 and 3 load cells

I am doing a small project with ESP32 and HX711 and I need to have 3 load cells. Like this one: I am totally newbie in electronics, my ground is programming. What I found are projects with 1, 2 or ...
55 views

### How can I map bits in a byte to turn on or off a pin?

I have a byte of data as input and each bit represents the state of an led. The pins that control the leds are spread out and on different ports. I have C code that changes the state of 6 leds. ...
34 views

### Calculation of noise in Non inverting Op-amp circuit

I have this non inverting op-amp circuit: I would like to calculate the output with the Op-amp noise impact. I can easily find the voltage output, but only if I assume there is no noise. How to do ...
34 views

### Charging three individual capacitors with one AC power source

I'm trying to charge three capacitors by using my country's net voltage of 230V (60Hz) AC. The net voltage is connected to a diode bridge, which thereby results in approximately 325V DC. Each ...
16 views

### 310 watt light bar on 12 volt car battery [migrated]

I am currently looking at a 32 inch 310 watt LED light bar for my 2010 Honda CRV. The light bar I am looking at is https://www.amazon.com/dp/B07MCNYXFT/ref=cm_sw_r_cp_apa_i_JpKPDbTR3J8R4. The wiring ...
17 views

### state space representation of system with a disturbance

my question is how you can convert the bloc diagram which have a disturbance input to a state space representation and how you can calculate the controllability matrix then if you can give me any ...
36 views

### DC brush motor EMI

What kind of frequency does a DC brush motor generate? There are a few explanations online as to what causes EMI in DC brush motors (commutator sparking for example) and how to reduce it, but no ...
12 views

### Baseline response vs tuned response in pidtool Matlab?

I am using pidtool in Matlab and it shows two graphs One is tuned response and other is baseline response as shown highlighted in linked photo So here what is meant by baseline response? Does ...
33 views

### Low impedance voltage testing (LoZ)

Is there any issues with using low impedance mode on a multimeter for day to day testing on mains voltage 240Vac or if this mode should only be used when testing for phantom voltage? Is there any risk ...
80 views

### Over current Protection for Ne555 circuit?

I made simple frequency generator circuit with Ne555 but almost in every circuit Ne555 IC burns after few use. Ne555 starting to heat up then outputs weird signals , if I don't stop the supply Ne555 ...
16 views

### How to characterize a lower node transistor?

I am a fresh college graduate and have recently started working as analog design engineer. I am working on 22nm FDSOI technology, And characterizing this device has been trouble for me. The device is ...
36 views

### How to incorporate EL wire into a standard circuit?

I am trying to integrate some EL wire into a standard circuit but having trouble - I have some standard copper wire with a main supply and want that to run into an inverter (as I need one) and then a ...
57 views

### What is the impact of Earth's magnetic field polarity on consumer electronics?

Earth's magnetic poles are known to have inverted in the past. How are commonly used circuits or component of consumer electronics (from energy production/transportation to TVs, mobile phones and PCs) ...
10 views

### HV9961 led driver: trying 170V led output

I face to some issue with my prototype based on the HV9961 (see picture). I replaced L1 by a 1.8mH power inductor and R1 by a 68k resistor. Those values came from HV9961 datasheet formulas for a 170V ...
34 views

### RGB to YPbPr (YCbCr) conversion and bright picture issues

I'm working on a specific RGB to YPbPr (component) converter. It is supposed to connect old consoles to a modern flat 240p supportive TV. However I have an issue with luma Y output part. Here is the ...
32 views

### Confusion understanding transient behaviour?

I am trying to simulate PID controllers in MATLAB Simulink, but I am bit confused by the term "transient behaviour" in how its extreme highlighted forms (aggressive and robust) will affect the system ...
10 views

### What's that fan sink? Fan sink family dimensions [migrated]

I have a card with a Dynatron V35G fan sink on it. It looks like this: Now, this fan fits the card I'm using, but it is very noisy. I want to take the opportunity to try to improve my card and ...
19 views

### STM32F4DISCOVERY: problem with ADDR bit and receiving WHO_AM_I register value of MPU6050

I am doing I2C project with MPU6050 using STM32F4DISCOVERY board. The ADDR bit in SR1 register is clearing in one instruction execution without reading SR2 register. I am getting WHO_AM_I Register ...
20 views

### Designing transformer for uc3842 offline flyback power supply

I need help on how to calculate turns in flyback transformer for the above mentioned power supply. Now I know about designing Half bridge, full bridge and forward converters but I am unable to figure ...
25 views

### Common types of control logics/schemes? [on hold]

What are the different schemes/logics for controllers? Only these 3 Pid controller , on-off controller and fuzzy controller ? Or there are also schemes/logics other than these above 3?
35 views

### Auto-zero chopping op amps & ADC conversion

In our project, we developed and tested a auto-zero chopping op amps coupling with Sigma-delta ADC for low-frequency voltage signal measurement. Below is the FFT spectrum from the 1-bit data stream of ...
35 views

### DC Voltage Regulation - 5vdc output, 12, 24, 48vdc input [on hold]

I am designing a pcb that gets used in 3 different products with 3 different voltage supplies. One uses 12VDC power brick, another 24VDC, another 48VDC. I am working on the new design for this pcb. In ...
62 views

### Op - Amp: Linearity, Negative Feedback and Virtual Short

I need some explanations about Linearity, Negative Feedback and Virtual Short for an ideal Operational Amplifier. Precisely, I have been always told that an operational amplifier with negative ...
48 views

### Wireless game controller - polling vs events

I'm creating wireless game controller, but I have problem with sending data - should it be in polling mode or event based? For analog axes I think that polling is better. 100Hz or more polling rate, ...
34 views

### On-off controller open loop or close loop?

Are all On-off controllers used for close loop control systems or can also be used for open loop control systems?
103 views

### How to amplify voltage difference between transistors?

I have a Bottom Gate TFT transistor: W/l=320um Substrate: corning glass Gate: 60nm Molibdenum Dielectric: 350 nm Ta2O5 Semiconductor: 30nm IGZO S-D: Molibdenum 60nm It is wired like so (if anyone ...
31 views

### Sensor fusion using IMU sensor

How to do the sensor fusion using the 4 IMU sensors. Here, 4 IMU sensors are used to know the location of every point where the IMUs are placed? I need the location of the every point on a 3D graph ...
32 views

### Choosing Collector Current for Transistor Amplifer

I see in the guides to standard Bipolar Transistor circuits (emitter-follower, common emitter amplifier), they always say: Choose a quiescent current of 1mA. How is this value chosen? I look at the ...
52 views

### Running a 36V motor controller on li-ion

I recently bought a 36V BLDC motor controller (the \$10 ones from ebay) without taking into consideration that when fully charged my battery voltage is actually 42V. I found a similar question where ...
404 views

### Fiducial placement

I've read that fiducial should be placed on the corners of the PCB. And that no more 3 should be placed. Below are some questions I can't seem to find online. 1) Would it be a problem if there are ...
52 views

### Understanding Voltage/Power line arrows in complex schematic

I have some understanding of general electronics but now I want to learn about actual electronic schematics. For this I look at some complex reference designs to somehow get an understanding because ...
I have a task where I need to implement a filter circuit (active) for the following transfer function: $$G(s)=\frac{(s-5447)}{(s-961.3)}$$ So, we have one pole and one zero. The bode plot is as ...