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30 views

LMK03318 Programming Data Failure

I am trying to program the LMK03318 clock generator using the CodeLoader IDE from TI and the USB2ANY programming module. I am seeing issues with the SDA and SCL lines. When I probe the SDA and the SCL ...
4
votes
4answers
163 views

Are solar panels ever used to remove energy?

Solar panels convert energy from the sun into electrical energy. Following the first law of thermodynamics, this means they remove some of the solar energy that would otherwise most likely be absorbed ...
1
vote
1answer
46 views

Charge unspecified battery pack through 2.5mm DC output cable

I recently bought a new bike/cycle that came with a BBB Highpower 2.0 torch/lamp. The lamp is attached to a battery pack with no specifications on the outside through a 2.5mm DC connection cable. I ...
4
votes
3answers
271 views

Spartan-6 -- Map failed due to using a non-clock pin for a global buffer instance

I'm trying to use Spartan 6 (TQG144) PLL to generate a high speed clock. I used IP core generator to config the PLL. Here is the simple VHDL code I have to use the generated component: ...
0
votes
2answers
59 views

Transform linear acceleration from frame of reference of IMU to vehicle

I'm using a 6-axis IMU (accelerometer + gyro) and collecting lateral and longitudinal acceleration (Ax an Ay) when in my car. But this device (with IMU) is positioned at an angle when plugged into the ...
0
votes
1answer
53 views

Microcontroller MOSFET-driven RGB LED strip controller

I'm trying to DIY a very simple RGB strip controller, nothing fancy. The goal is that it has to be driven from a 3.3 V / 5 V microcontroller output, using some N-channel MOSFETs. Since I've never ...
0
votes
0answers
73 views

Does an eFuse exist that latches off immediately (and does not reactivate) in case of a short-circuit?

I've just discovered eFuses (from Texas Instruments + Toshiba + STMicro). In case of a short-circuit on the output, MOS can be disabled in 150-500 ns by detecting a surge of current (called "fast-...
0
votes
3answers
59 views

Unusual Polarity Symbols on Universal Adaptor

The polarity symbols on my universal adapter look a bit different to ones I have seen. Which setting should I use to power the device shown please, top or bottom position for the switch on the adapter?...
1
vote
2answers
67 views

Frequency domain design of a PI controller for a first order system with transport delay

Let's say I have following first order system with transport delay $$G(s) = \frac{4563}{s + 64.77}\cdot e^{-0.000455\cdot s}$$ My goal is to design in the frequency domain a PI controller in the form $...
-1
votes
0answers
58 views

Help identify an SMD component

I am having trouble identifying component in this circuit. I suspect this is a diode. This is on the Harman Logic 7 amplifier motherboard.
1
vote
1answer
64 views

Appropriate circuit for activating relays

I am trying to use two G5V-2-DC5‎ relays to switch four wires at the same time between two different outputs. All signals are 5v. I've gotten this to work fine with a simple physical switch but want ...
-2
votes
1answer
67 views

Why is the capacitor filter in parallel with the load and the choke in series in a choke input filter?

What will happen if we interchange them? In a capacitor filter, the capacitor discharges through the load, it was connected in parallel to load. From what I have concluded, if the capacitor is in ...
0
votes
0answers
53 views

I2C bus slave powered before raspberry pi master

I have a number of I2C slaves (PCF85063AT) connected a Raspberry Pi, which acts as master. For various reasons the I2C slaves are powered at all times, where the power to the Pi can be controlled on/...
1
vote
2answers
57 views

How to interpret S parameters on a Smith chart

I am trying to understand S parameters on RF transistors. I chose the BFP840ESDH6327XTSA1 as my RF transistor, to operate it at 10 mA, 12GHz. The design should be optimal for simultaneously matching ...
0
votes
0answers
17 views

Resource/Materials suggession for WRSpice tool

I am new to the WRspice tool and just have the manual for reference. Is there any platform or any other resources that can be referred to for the WRspice tool?
0
votes
0answers
31 views

What is SystemVerilog equivalent for VHDL fixed_pkg and float_pkg?

The VHDL fixed_pkg and float_pkg provide some very interesting functionality. The fixed_pkg is supported by some synthesis tools but the float_pkg is not supported at all. They basically provide a ...
-7
votes
0answers
50 views

What are the advantages and the disadvantage of the LT1215AM opamp and what type of op-amp is it? [closed]

I want to know the advantages and the disadvantages of the LT1215AM op-amp, and what type of op-amp it is. Thank you.
0
votes
1answer
46 views

What is the SystemVerilog equivalent of the VHDL "library"?

I have been writing VHDL for a while. There, we have the concept of libraries, which comes in handy. I cannot find something of this nature in SystemVerilog. Is it true that SystemVerilog has no ...
1
vote
1answer
23 views

Can phased-array (ULA) gain tapering effects be modelled using digital windows?

I am attempting to model the general behaviour of various tapering techniques. It seems applying gain tapering to a ULA has very similar effects to that of applying a digital window to a signal. In ...
8
votes
3answers
846 views

Pull-up and pull-down resistor on one trace

Does it ever make sense to have both a pull-up and a pull-down resistor on the same trace? Background: I'm designing a backplane to follow the OpenVPX guidelines and I saw this rule Rule 7-20: The ...
1
vote
1answer
69 views

4 pin round connector identification

Does anybody recognize this connector? I’ve scoured the internet, but can’t find any connectors with this type of keyway. It is for a data acquisition system.
1
vote
3answers
91 views

LED driver 3.5V 25A. Low voltage, high current

I need to make a driver for an LED that works at 3.5 V 25 A. My idea was to make a DC/DC regulator from 12 V to 3.5 V and then a current limiter, but I'm at a loss as to which IC to use or how to ...
13
votes
3answers
3k views

Scam? Does having this capacitor wired as shown provide any surge protection?

Bought this on Amazon as a dryer 240V SPD. I was trying to find out if this device is an outright scam. I found a similar post on here from several years ago but that did not answer my question. ...
0
votes
1answer
88 views

Novice looking for help with a current sensor circuit

I'm an electronics novice trying to figure out how to detect when current is flowing to certain tools in my shop so I can add some automation to my dust collection system. I essentially want to build ...
1
vote
1answer
46 views

PSFB - Asymetric current at the secondary

At the 3rd step of the PSFB cycle, the current at the secondary is not shared equally by the two windings that it would be if it were a full bridge. Does anyone can explain why it is not the case ? ...
0
votes
1answer
56 views

RTL to Gate Level Design - Verilog

I have written the following code for sinc3 flter in verilog (Vivado). I need to ask how shall I now convert this RTL design to a logic Gate level design in verilog (add AND, NOR, flip flops, etc.)? ...
3
votes
2answers
104 views

How to achieve constant current around 325mA for a 1W power LED with low headroom voltage

I built the circuit suggested by @MicroservicesOnDDD in their answer to this question: Low Overhead Constant Current LED Driver and had a play. Here's the circuit in the linked question: The most LED ...
1
vote
1answer
30 views

ESP32 - Idf Arduino QueueHandle_t as function paramater

I am using ESP32 module and coding it using Arduino. I am trying to read from Serial2 (attached to hc-05 bluetooth) and push it to FreeRTOS queue. There is one task(task4F) pinned to core-1. To ...
4
votes
2answers
725 views

Convert a 12 V DC motor into a 24 V motor

I have a trolling motor that is rated at 12 V. I want to double the speed of the motor. If I change the armature wiring by using a thinner wire with more turns, will I able to use it on 24 V DC to get ...
0
votes
1answer
15 views

How to change the pin type in Lattice Radiant

I'm using IP-core with slave-device clock in Lattice Radiant. On the Device Constraint Editor this pin determinated as clock-pin and I can't place it on correct pin on FMC. This question is similar to ...
1
vote
2answers
42 views

STM32 and ESP8266EX Flash Programming

I'm a complete beginner to electronics, I have done few projects using different modules, it's so easy to do with modules. Now I want to learn and do some advanced hobby projects. So I decided to ...
1
vote
2answers
46 views

Can I connect the pull-up resistors of I2C lines to 3.3 V on a 1.8 V device?

I need to use the following sensor in my project : AS7341 (ams). It is a spectrometer whose data are accessed through an I2C inteface. The datasheet can be found here. It is stated that its power ...
0
votes
0answers
40 views

Intermittent USB Enumeration

I have a FS USB-powered device I'm working with. We have multiple different devices that all use the same USB circuitry, but for some reason on the latest build (700 pieces) of a particular device we'...
-2
votes
1answer
55 views

How to find gain k? [closed]

I was give this equation and I have simplified it, I calculated the CLTF but not too sure if it is correct. But I’m more concerned on how to calculate the gain value k. Can someone give some guidance ...
0
votes
0answers
37 views

How does SNR improve with impedance matching in a radio receiver?

I've seen basically every question and answer on here relating to impedance matching, and why you need it in RF but not in audio applications, and I'm still missing something. I initially was ...
1
vote
0answers
73 views

Lost Ethernet connection with temperature

I have designed an unmanaged Ethernet switch, and cameras that are Ethernet-based with a 100 Mbps connection. If I test my cameras with a commercial switch, they work very reliably up to 60°C or so. ...
0
votes
2answers
61 views

Charging by electrostatic induction

In the given figure, if we connect the positively induced side of the sphere to the earthing instead of connecting it to the negatively induced side, then will the sphere get negatively charged ...
0
votes
0answers
27 views

P-MOSFET driver

I need to drive a P-channel MOSFET from an output of a 74HC595 shift register which is controlled by an ESP32. The MOSFET load will be a high power LED. Once the register is latched the outputs will ...
1
vote
0answers
125 views

Why can't my kiln reach the needed temperature?

I'm building an electric kiln to melt metals like lead aluminum, and maybe even copper. I have no experience or professional knowledge on the subject. I want to be able to reach at least 1100°C but ...
0
votes
1answer
26 views

Package of Flash memory S25F064L

I need to use a SPI Flash from Cypress / Infineon to build a prototype for a future product. The exact model I have ordered is S25FL064LABMFM000. According to the seller page it is a SOIC16 package ...
0
votes
0answers
51 views

Equivalent capacitance and resistance [closed]

How could I calculate the equivalent resistance and capacitance of this circuit?
0
votes
0answers
32 views

Switching capacitors input stage

In the image below, when switch S1 is closed. CA1 and CA2 charge to VAINp and VAINn. And CB charges to VAINp - VAINn. Lets say VAINp is 5volts and VAINn is 4 volts at the peak transient voltage. If ...
0
votes
0answers
26 views

Analyzing circuit that cascades a pseudo NMOS inverter with a CMOS inverter

I have simulated this circuit in LTSPICE and it seems that the output is only High for A = 0 and B = 0. In other words, the circuit behaves similar to a NOR gate. However, I'm having trouble analyzing ...
-1
votes
0answers
49 views

Small range precise distance sensors [closed]

I am looking for a component that precisely measures deviations in mm. The component will be held at a distance approx 1cm from the area being measured. I am going to connect this device to a computer ...
4
votes
4answers
255 views

Limit inrush current for USB and large capacitors

I am building an ESP32 custom board (project link and full schematics/layout.) I want to add USB to it for programming only. Power Supply: USB to serial: During normal operation, the board will be ...
0
votes
3answers
44 views

Bode Phase Plot for negative transfer function

My question is relatively simple. Supposing that we have a transfer function of the type \$\frac{-Kj\omega}{\omega_0}\$. Then for the phase Bode plot, I should start from \$\pi\$ and then add \$\frac{\...
-1
votes
0answers
40 views

How can one connect external sensors to an Android device to receive data from the sensors on the phone?

I need to build a device which transmits data from wearable biosensors wirelessly to an Android mobile device. For example - How can we transmit data from a small ECG device connected to ones chest ...
3
votes
1answer
52 views

Risks of variable power loads on an offgrid inverter (zero-crossing PWM)?

My goal is to regulate loads in my offgrid inverter-powered system. I moved to a fully offgrid house with batteries and a pure sine inverter. I would like to control how much I dump of my solar ...
0
votes
2answers
79 views

How do embedded systems deal with virtual and physical memory addressing?

I'm referring to the Wikipedia page about virtual memory, the last paragraph in Usage section: Embedded systems and other special-purpose computer systems that require very fast and/or very ...
1
vote
1answer
59 views

How to specifiy my USB cable so there is no risk of fire?

I am making a USB powered device that draws very little power. It is powered by a USB 2.0 cable, with the power wires soldered to contacts on the PCB. The cable has to be about 3 meter (10 foot) long. ...

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