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213,169 questions
3 votes
2 answers
267 views
How to estimate power dissipated in LDO from datasheet?
I'm doing a thermal analysis and need to estimate the worst-case dissipated power in this LDO. My thinking is to do this: (input current * input voltage) - (output current * output voltage) But ...
1 vote
2 answers
80 views
LDO voltage regulator feedback ladder trim at 1 %
I`m working on a feedback ladder for an integrated LDO voltage regulator. I would like to implement trimming in it so that you can choose between: 1.867 V -1%, +1% +2% So that you can choose between : ...
2 votes
1 answer
79 views
Powering a 16 bit ADC present in wearable device using a buck boost converter
Basic Explanation of my System: The proposed design is a battery-powered wearable device that integrates advanced sensing and power management features. The system operates primarily from a single-...
-2 votes
0 answers
36 views
Measure DC Current and Voltage of Electronic Devices and send data over USB to PC [closed]
I am building a test rig for computer systems that would contain different single board computers running different software program that would change their power consumption during operation, now in ...
-1 votes
2 answers
56 views
Noise Reduction
I know how important it is to use capacitors to reduce noise in a DC circuit. I use them to ensure Vs is clean for any ...
0 votes
0 answers
54 views
Seeking Solutions for Turn-On Overshoot When Driving Large Capacitive Loads with CC/CV Supply via H-Bridge
I have designed a 9V, 2.5A constant current/constant voltage (CC/CV) power supply based on TI's TL431/TL431W reference design ("Designing CC-CV Feedback Circuits With the TL103WB"). The ...
3 votes
3 answers
122 views
How to achieve constant LED current when switching another load with transistors
I'm building a formicarium to have below my monitor. With a Pi pico 2 W as controller, powered by a USB3 port on the monitor. I'm a software developer, but new to electronics. The schematic below is ...
0 votes
1 answer
39 views
Automation of power transformer parallelism of single bus with breaker sectionalizer
In the following bus scheme, that contains one breaker sectionalizing the bus: How is the automation of TR1 and TR2 parallelism performed? I have read that the tap of a transformer must be changed (...
0 votes
1 answer
49 views
What is the advantage of the L0103DE triac versus two SCR's wired back to back, and how can the reverse-gate-current turn-on for Triacs be determined?
Following my LTSpice simulation of the L0103DE triac: I see that this Triac appears to act just the same as two SCR's wired back-to-back (see its datasheet link here). I am a little bit confused by ...
0 votes
1 answer
73 views
Ambilight with HDMI [closed]
I want to build an Ambilight analog on a Raspberry Pi. I need to use the HDMI input for this, but the board only has HDMI outputs and no input. Therefore, I decided to use an HDMI to Raspberry Pi 4B ...
5 votes
4 answers
447 views
Why would STM32 have a diode in series on the NRST line if it's supposed to get signals from STLINK?
Wouldn't the diode block any incoming signals? How does the NRST actually work? All I can infer from the datasheet is the pin is responsible for mcu resets, it has an internal pullup-high resistor ...
10 votes
2 answers
716 views
SPI bus layout with 8 slaves
It's my first time working on a board with more than 2 slaves on SPI bus and I'm not sure if I'm doing it right. Also, I can't find any clear instructions how I'm supposed to do layout. The SPI clock ...
2 votes
1 answer
51 views
LM5069 Soft-Latch Power Control Circuit
I’m designing a power control front-end for a 48 V (60 V max) system using the LM5069 hot-swap controller. My goal is to implement a press-to-turn-on / MCU-latch-ON / MCU-kill-power sequence using ...
0 votes
0 answers
42 views
STM32H723ZG - Can I receive 32 bits on a max 16 bit data size SPI receive only slave input?
I am working on a problem where I have many SPI devices and many populated SPI inputs on a STM32 H7 Nucleo board. SPI 1, 2 and 3 offer transmitting and receiving data of sizes up to 32 bits, but SPI 4,...
3 votes
1 answer
149 views
Zero-Cross Detector with LM393 + 9 VAC Wall Adapter
I’m building a zero-cross detector using an LM393 OpAmp (as that is readily available with me). My AC source is a wall adapter (plug-in transformer: 120 VAC → 9 VAC). The output block has three ...