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# Electrical Engineering : Recent Questions and Answers

## Iv'e designed a space elevator using a series of lasers. do you know anybody i could submit the designs too that could manufacture the concept and put it to use

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Asked on 04/15/2022 by Thomas Moss

## Power supply and motor drivers problem.

I have a 24 volt 6.5 amp power supply which I am using to power a stepper motor driver which is rated to 3.5 amps max. Will directly connecting the...

## Bypass Gate-to-trigger-converter via switching jack

GoalI like to trigger a LF398 Sample-and-Hold IC via a 3.5mm Jack (modular synthesizer). The desired behaviour would be: if a cable is plugged in, incoming...

## 500 mW RF amplifier for 170 MHz design

For a new project I need to build an RF amplifier for continuous-wave with about 500 mW (27dBm) output at 170 MHz. It doesn't need to transport data, it is...

## How to calculate d-axis and q-axis inductance from line to line current?

I'm wondering how to calculate the d-axis and q-axis inductances for a BLDC motor given the line to line inductance L. My hunch is to use the Park and Clark...

## can I also use phasors/concept of impedances for non sinusodial signals?

I know that phasors are great to solve circuits driven by sinusodial input signals but I was wondering if I can incorporate phasor concepts(like impedance) to circuits driven by input...

## Can I share a single pull resistor on multiple enable pins to save space?

I am using this Schmidt trigger IC SN74HCS125 which has 4 channels I would like to save some board space by hopefully using only one resistor to...

## Calculating Antenna Directivity Numerically

The equation for peak directivity of an antenna is this (example source) {D = frac{1 }{ displaystyle frac{1 }{4 pi} int_{0}^{2pi} int_{0}^{pi} |F(theta,phi)|^2 sin(theta) ,...

## Driving Stepper Motor with Sine Wave

I am attempting to drive a stepper motor where each phase draws 1 A at 3.5 V using a sine wave oscillator that outputs two signals 90 degrees out of...

## DC backup battery switching module

It is common to find these cheap Backup Battery Switching on the internet. But the issue I have with these ones is the load gets reset when switching from the...