Hobby Electronics Basics

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Optimum electromagnet dimensions

Using an air core electromagnet with a given length of wire, what dimension s would be optimum for maximum force agains...
6 comments posted 12yrs
posted by bperryb
6 comments posted 12yrs posted by bperryb

Buck-boost DC-DC converter online simulation

Online simulation of buck-boost converter DC-DC converter is ready. Buck-boost DC-DC converter has special feature that...
0 comments posted 12yrs
posted by pchung705
0 comments posted 12yrs posted by pchung705

HF design approach

Hello to all, I am designing an amplifier for frequencies between 500khz to 5Mhz. (+/-40V ) a couple of watts. I am a n...
16 comments posted 12yrs
posted by lerameur101
16 comments posted 12yrs posted by lerameur101

Windows Log In Question

I have my wife's computer set up so that, after some length of time of no usage, it logs her off, requiring password en...
7 comments posted 12yrs
posted by To-Email-Use-The-Envelope-Icon
7 comments posted 12yrs posted by To-Email-Use-The-Envelope-Icon

Random Timing Echo Noise Reduction

Downwardly mobile types in apts may have noticed that it is 100% useless 95% of the time to tell the meth head next doo...
1 comments posted 12yrs
posted by bret.e.cahill
1 comments posted 12yrs posted by bret.e.cahill

Joule Thief inductor cores

What material is ideal for low-power Joule Thief inductor cores? Ferrite, or powdered iron? Is an air gap desired, or n...
14 comments posted 12yrs
posted by mrdarrett
14 comments posted 12yrs posted by mrdarrett

Protection for CMOS output?

I want to build a simple manual count-up system with a local as well as a remote 2-digit display. The system will be ba...
2 comments posted 12yrs
posted by Pimpom
2 comments posted 12yrs posted by Pimpom

Buck DC-DC converter online simulation

Online simulation of buck (step-down) DC-DC converter is ready. http://www.cirvirlab.com/simulation/smps_buck_converter...
0 comments posted 12yrs
posted by pchung705
0 comments posted 12yrs posted by pchung705

help fix my Lord Kelvin thunderstorm

trying to learn the kids (via discovery) about electricity and how to generate etc.. We were working through static ele...
19 comments posted 12yrs
posted by some
19 comments posted 12yrs posted by some

More Math for the "SETUP"

The ?setup? is a board that I'm testing to measure three items: Input voltage, Voltage across a 47.5 ohm sense resistor...
61 comments posted 12yrs
posted by nojunk
61 comments posted 12yrs posted by nojunk

A reliable light sensing circuit?

It's been a few years since I did any significant electronics in my shed/ w orkshop. But I'm going to have to get stuck...
6 comments posted 12yrs
posted by terrypingm
6 comments posted 12yrs posted by terrypingm

Any speaker experts here?

This speaker question kinda goes with my previous question(s) about tubes. I have been looking at tube stuff on the web...
32 comments posted 12yrs
posted by etpm
32 comments posted 12yrs posted by etpm