# All Questions

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32 views

### Calculating and Simulating Voltage dependent source circuit in LTSPICE - What am I doing wrong?

I'm trying to calculate the total resistance seen by the source v1 in this circuit and we have a voltage dependent voltage source in this circuit with a gain of 0.1 (v1) which is the voltage across ...
36 views

### How to calculate the GDDR5 Capacity from this table?

How to get 4Gb capacity from this table? I understand it this way: (1) total address is 14 + 6 + 4 = 24. each address (atom) is 32bit. So total capacity = 2^24 * 32bits = 512 Mbit. I am not sure where ...
57 views

### What pins in Radar ECU and Camera ECU should be detected for OC, STG, and STB faults and why?

A typical Electronic Control Unit(ECU) performs Open Circuit(OC), Short to Ground(STG), and Short to Battery(STB) Diagnostics on selected internal and external pins in the ECU. For example, consider a ...
56 views

### Why is the rectifier (using diode bridge) and delay circuit (using IC 555) close together, and malfunction? [closed]

I designed a rectifier (using diode bridge) and delay circuit (using IC 555). When I tested both circles by connecting but separately connecting the two PCBs The end result is working normally. But ...
72 views

### Would there be any safety issues if the input voltage on the primary coil is bigger than what the rated voltage is?

I have a neon sign transformer that converts 120 V to 12 kV which is the rated voltage. Using the 1:100 ratio would it be safe to have the input voltage be 140 V converted to 14 kV when the specified ...
52 views

### How to factor roof angles and inverter efficiency in sizing a solar PV system?

I want to install a number of Mission Solar 420 W PV panels (pdf) on my roof. By estimating an average of 5 solar hours per day over the course of the year, I believe I need 9 kW of panels. So by a ...
57 views

### Can I use a 3.7 or 7.4v lithium ion battery to power 6 coin cell motors?

I am doing a project that involves 6 coin cell motors. I am looking to use a lithium ion battery but I'm not sure of what voltage so I'm reaching out to see if anyone has advice. Technical details on ...
53 views

### Theremin not sensitive enough [closed]

I have repurposed a mini theremin kit for a Paranormal research device. (search Rem-Pod) my problem is, you pretty much have to be touching the antenna to set it off. How do I increase the field so it ...
58 views

### How do appliances change their resistance when voltage changes?

Assuming all connections are DC (avoiding any RMS, phase, and impedance calculations), if the power of an appliance is constant, and I change my country from a 240 V to 120 V one, my appliance will ...
40 views

### How many different combinations of connections for 4 connections and 4 wires? [closed]

NUMBER OF COMBINATIONS OF CONNECTIONS 4 CONNECTORS [C1] [C2] [C3] [C4] 4 WIRES --W1-- --W2-- --W3-- --W4-- The catch! Each connector can have 1 of 4 wires or ...
45 views

### Can I connect a DC-DC step-up converter to a DC-DC step-down converter in series?

My problem is I need 3A at 5V from an 18650 cell. I bought a DC-DC converter that should do that, but they are garbage specifically the XL6009 it seems that they'd prefer to operate in high voltage vs....
48 views

### I2C seems to work but all register reads return 0s

I'm debugging an audio codec WM8962B via I2C. I wrote basic code for a manual I2C read operation of a given register. I'm using PSoC 5LP to do it. The 7bit slave address is 0x1A and I'm trying to read ...
108 views

### Are USB cables active circuits?

I always assumed a USB cable between two devices is just a collection of wires. I recently saw some pictures when shopping for cables indicating they have internal circuitry. Could someone clarify if ...
65 views

### How can the NSI45020T1G claim to "turn on immediately"?

The On Semi NSI45020T1G, a simple two-terminal inline current regulator, claims in at least two places that it "turns on immediately". However, it cites a capacitance between 2.5 and 2.7 pF....
83 views

### Amplifier diode circuit

I've made a circuit with the schematic: The output pulses are only 1.5 $\mu s$ wide; does it make sense? I also want to get wider pulses, increased to 100 $\mu s$, is that possible? Is it ...
47 views

### Connecting 2 batteries in a automobile [closed]

I have 2 batteries that I will be connecting to each other in an automobile with a common ground - the vehicle body. The first battery is an AGM deep cycle I believe and the second one is https://www....
35 views

67 views

### Connect IR LEDs to PC via 3.5m audio jack

I have a pair of LED IR emitters like the ones shown below I have connected them to my PCs audio jack but the IR is not turning on. Is there any way I can get them to continuously emit for a head ...
31 views

### Battery power for electric door motor

I am adding a motor to my door to operate a latch. The motor needs 12v DC and a third 12v pulse to trigger it to open. The power supply will only be available while the door is closed (it is a pivot ...
62 views

### Designing a sequence detector circuit in verilog, The circuit is supposed to have a one-bit digital input [closed]

I have the task of building a sequence detector circuit with 1 byte input and I need to provide last 2 digit of my ID to the input and it starts from least significant byte, output of circuit will go ...
47 views

### Using a power MOSFET for reverse current/battery protection

In the setup below, I am using an FQP47P06 power MOSFET for reverse current/battery protection. The picture doesn't show it, but the battery voltage is 36 V and the current passes through a 12 V ...
76 views

### Self resetting crowbar circuit for over voltage protection

I'm trying to design an over voltage protection circuit that doesn't rely on custom chips (the chip shortage has shown the danger of relying on this,) so I put together a crowbar circuit like this: I ...
59 views

### Finding a compatible EEPROM [closed]

I have a PCB which is almost like a computer that uses an EEPROM. I don't know much about EEPROMs so I have a quite simple question. The current EEPROM is a 24AA02UIDT-I/OT from Microchip Technology. ...
69 views

### Does an ideal voltage source go against Kirchhoff's voltage law?

Very new to electronics. Stuck on this topic: In a circuit with zero resistance an ideal voltage source of example 5 volts will produce 5 volts, since ideal voltages don't have an internal resistance. ...
41 views

### Possible fixes to a power supply thermals issue

The question applies to a buck converter design on my board: Here is a 3D view of this section: Layout of this section: L1: L2: Layer 3 is power and layer 4 is again a full ground plane. Here is ...
51 views

### Possible problems of AC energy metering using rectified waveforms

I'm building an energy metering circuit with discrete parts and precision is not a big deal in this case. One friend had the idea of rectifying both the voltage and current waveforms before sampling ...
45 views

### A6211 works fine alone, but when I merge two A6211s on the same PCB, there is a current leak

I need some help; I probably lack electronic knowledge here. I got an LED driver circuit from Allegro. It uses the A6211 IC. First I tested it on a protoboard and it worked fine; I controlled two of ...
57 views

### Using a voltage follower to stabilize the ground in a single supply op-amp circuit

I was building a distortion circuit using op-amps and had to figure out a way to power the op-amp using a single supply, in other words I wanted to obtain +half supply voltage and -half supply voltage ...
85 views

### How to make a controller for a universal washing machine motor?

I found a broken 2000ish Whirlpool washing machine called AWT4085 in a junkyard. I bought it for a school project like 'E Waste can be reused' topic. It was like 10 bucks or so. It had a lot of ...
37 views

### Finding Phase Angle

How would I go about finding the phase angle at different times? For example at 50 Hz with a full cycle time of 20 ms I know at 10 ms the phase angle would be 180°. What calculation could I use to ...
168 views

### Discrete amplifier not passing audio

I have a card that can receive two dual input opamp with feedback. The card is currently connected to V+ and V- only for taking measurements. The +24V rail is doing great. I also know for sure that ...
94 views

### Are there any fixed point calculators? [closed]

Is there a fixed point calculator that would convert something like, signed binary, 111.00100 to -0.875? For instance, does MATLAB have anything like that? Below are the steps I am doing manually. ...
78 views

### Can a push button with a single click using an Arduino have more than one function?

I've tried to google this and failed, but I am trying to figure out if I can use a momentary push button and some controller like an Arduino UNO (which I have) to activate two LED lights, one after ...
46 views

### ATX power supply: start up current over 500 W? [closed]

I just took an old ATX (computer) power supply, wanting to use it as a lab supply (it provides -12 V, +3.3 V, +5 V, and +12 V with plenty of current (except for the -12V)). At home, we have a dual ...
45 views

### To turn a ratioed circuit into non-ratioed circuit, what should be the transistor sizes for proper operation of this circuit?

The circuit is at the bottom. I know it is a ratioed circuit however, how can I convert it to a non-ratioed circuit without adding two more PMOS transistors between Vdd and the other PMOSs. Also, what ...
93 views

### I would like some feedback on my circuit design based on a DIY op amp circuit

I am following a design based on GreatScott's DIY or buy microphone op amp. I made some modifications and changes regarding the design, and made the schematic using Fritzing. This is my first time ...
27 views

### Powering brushless motor only works with separated power supplies

I have recently taken over for a guy who retired from my company and I am working on getting a prototype that he designed back in 2016 up and running. We are using two 3.6 V 18650 batteries to power ...
141 views

### Why are we using unpolarized plugs here in Europe?

The whole world is using polarized plugs and only Europe is using unpolarized ones. Why is that the case? Isn’t it better to use polarized plugs? Why aren’t fires starting when you plug in the plug ...
61 views

### Control system with one setpoint, one process variable, and two outputs?

I asked a version of this question before and got some unhelpful answers, I think because 1) the minutiae of my question distracted from the core concept, and 2) I didn't adequately describe the ...
27 views

### IGBT Power losses and thermal resistance

I just want to make sure if my method is right or wrong and have some questions about it. I want to calculate power losses and thermal resistance of IGBT module in PWM applications and all parameters ...
35 views

### Board to convert a composite video single to spi [closed]

I'm currently undertaking a project which requires a small (around 2.6 inches diagonally) lcd to function, however the only lcds at that size I have been able use an spi interface designed for ...
19 views

### ST-LINK/V2 in-circuit debugger/programmer for STM8 and STM32 issue with IAR Embedded workbench

I've been working with ST link v2 programmer/debugger for a while with IAR embedded workbench. Recently, each time I start a debug session or I appoint a break point and I arrive at the breakpoint, ...
23 views

### 2.5gbs PCIe to ethernet bridge: where to find? [closed]

I want to use this switch: https://www.microchip.com/en-us/product/VSC7410 I would like to use one of its SGMII ports to connect to a host via PCIe. Microchip does have one of these bridges, but it is ...
76 views

### TMC2130 Stepper Motor on Raspberry Pi. SPI issue?

For the last few days I've been struggling to get a NEMA17 (1.5 rated current) stepper motor to function with TMC2120 driver (vref = 1.0) and I'm all out of options now to try, so I'm here looking for ...
25 views

### Digital implementation of State Space

I have a question regarding a digital implementation of a State Space controller. I have some rules of thumb when designing; when implementing the observer as well as the sample frequency. I say that ...