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Electrical Engineering : Recent Questions and Answers (Page 34)

Find answers to your questions about Electrical Engineering or help others by answering their Electrical Engineering questions.

Reduce burning time for a toaster by changing resistor?

A good looking toaster still working, but I notice recently the bread slices went always too much brown/black even with the minimal time setting (stage 1). The time levels are...

Asked on 10/29/2021 by Kavendish

2 answer

How to choose the MOSFETs for BLDC motor drive?

How to select the proper MOSFETs for Brushless DC motor drive circuit? The Motor will work at 22.2V max. voltage and 40A max. current....

Asked on 10/29/2021 by bbbuuhh766

0 answer

What polyfuses protect USB ports in a typical modern PC?

I would like to know what is the typical rating of a polyfuse used on modern PCs (desktop or laptop) with USB 2.0 and 3.0. TE Connectivity apparently ...

Asked on 10/29/2021

5 answer

How to use motor drivers with H-bridge and PWM input, to control direction and speed of DC motors?

I'm running series of experiments using a 6V DC motor. I'm using desktop DC power supply to power the motor and regulate its speed and everything works just fine, the...

Asked on 10/29/2021

2 answer

Photodiode amplifier circuits - why use an op amp instead of just a resistor?

Beginner question here. I've built a photodiode light sensing circuit in class and internship such as this one: I don't understand...

Asked on 10/29/2021 by Eddie Huang

2 answer

What is this electrical symbol? T with overbar in down-pointing triangle

I'd like to use an old laptop AC adapter in conjunction with an adjustable buck module as a project power supply. It works, but I'm ignorant of some safety details;...

Asked on 10/29/2021 by Boann

1 answer

History question - why are logic levels inverted between TTL and RS232?

I'm just looking for a historical answer as to why TTL and RS232 don't transition logically in the same directions. The signals are the same, but basically level-shifted and inverted....

Asked on 10/29/2021 by David Carta

2 answer

LDO linear regulator output problem

I am using this LDOInput Voltage is 14VOutput Voltage is 5VMaximum Load Current is 150mASchematic : I...

Asked on 10/29/2021

4 answer

How is wafer dicing economical (for small ICs)?

Is my understanding that, for a given technology, the cost of making a silicon wafer is pretty much fixed, in the sense that it will not change no matter how...

Asked on 10/29/2021 by valerio_new

2 answer

Should I ground my body when working with 200V+?

I was working on a project converting 220V AC to 5V DC and I accidentally touched the underside of the transformer which gave me a big shock and I was...

Asked on 10/29/2021 by DeadSec

11 answer

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