All Questions
203,942
questions
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How does an ethernet controller work?
How does ethernet controller or a network interface card work?
I'm a software engineer so have little background on electronics. I've seen some videos from Ben Eater to understand some basics. How ...
- 1
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0
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24
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MAX98357A creating popping noise/Understanding I2S for STM32
I'm trying to learn I2S on STM32. In this case I'm using the MAX98357A I2S amplifier breakout board from Adafruit, a NUCLEOF411RE, and an 8 ohm speaker
I found an example for I2S in general and I'm ...
- 15
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3
answers
28
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32 MHz Xtal network MB1874_HP
I'm designing a PCB heavily based on ST's MB1874_HP. It utilizes a type of crystal I've never used before (NX2016SA 32 MHz EXS00A-CS06465), and the provided schematic has left me somewhat confused.
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1
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65
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How is Hyperterminal Working, regardless of port settings?
I am trying to connect to a Quectel GNSS device that creates a virtual COM port in windows. I have always assumed these virtual devices work like a standard RS232 port with a fixed baud, however I ...
- 165
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This driver for LED bulb cannot output enough current, and the light flickers. Why? How to repair it? [closed]
The driver shown in the pictures below, is for a little 7-watt LED bulb with 9 2835 SMD LEDs.
The IC used in the driver is MT7828C whose datasheet and "Typical Application Circuit" you can ...
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2
votes
5
answers
72
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Linear Regulator Pass Transistor vs Parallel Regulators
I've been looking into using linear regulators to create a variable DC supply.
The two ways I've seen to increase the output current for linear regulators is to place multiple in parallel with small ...
- 29
3
votes
2
answers
73
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Can a "sharp turn" on a trace with an SMD resistor also present a risk of reflection?
I'm aware that in transmission lines, taking sharp 90-degree angle turns are a bad idea. Below is an example of different current behaviors of high-speed transmission lines from various shapes of ...
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In Altium Designer 23, is there a way to set a clearance rule that is measured from the center of a TH pad to the copper of any SMD pad?
The need for this rule is to have a proper clearance for a selective solder nozzle. When a selective solder machine puts solder on a TH pin, the nozzle is at the center of the pad. I need to make sure ...
1
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1
answer
80
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What is the reason for 29.9kW PV inverters, when there are 30kW rated ones?
I have noticed various inverter manufacturers offering 29.9kW PV inverters as well as 30kW units. I assume this is due to a regulation or norm for inverters rated below 30kW, but I cannot find ...
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1
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49
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SCR relaxation oscillator does not oscillate when it should
I am studying this SCR relaxation oscillator and I cannot predict when it oscillates and when it does not.
The idea seems simple: as soon as the cathode voltage drops below SCR's gate trigger voltage,...
1
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1
answer
42
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Should the 120 ohm termination resistor in a RS-485 transmitter circuit for DMX be infront of the surge protection resistors or not?
I'm building a DMX transmitter, and follow the Texas Instruments guideline on IEC ESD, EFT, and surge resistant RS-485 circuits, having the following configuration at the moment:
The MOVs clamp the ...
- 15
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2
answers
75
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Why does a vehicle's GPS tracker go offline when a metal chain is attached with vehicle chassis?
From my colleagues, It has come to my knowledge that attaching a 5-6 feet metal short-link chain under a truck (Mazda T3500) that is installed with a GPS vehicle tracker can suddenly cause the tracker ...
- 67
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1
answer
30
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How to safely use a 110 VAC Solenoid Valve in a water system?
I am using 110 VAC solenoid valves linked here, to control the water flow in my system.
https://www.electricsolenoidvalves.com/1-8-110-120-volts-ac-electric-brass-solenoid-valve/?gad_source=1&...
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3
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52
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Is it correct to say that a D Flip Flop only stores a given value for a single Clock Cycle?
With respect to D Flip-Flop's, is it correct to say that a given value is only stored for the duration of one Clock Cycle?
I'm completely new to the topic of Flip Flops, but I believe I have a solid ...
- 113
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SD Card Writer Attached to ATmega328P Not Working Despite Success Using Arduino Uno [migrated]
I've designed a custom circuit board using an ATmega328P, which I intend to use for writing data to an SD card via a reader/writer module. When I initially tested the SD card reader/writer with an ...
