Hobby Electronics Basics

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Weight of electronic equipment

I'm importing some electronic parts/equipment (1kg worth) and wanted to compute a reasonable estimate of shipping costs...
22 comments posted 11yrs
posted by vek.m1234
22 comments posted 11yrs posted by vek.m1234

Trying to cheat ohm's law

For a circuit I described here recently, I want to be able to cause a brief , temporary, high current draw on a 12v pow...
15 comments posted 11yrs
posted by scott.a.mayo
15 comments posted 11yrs posted by scott.a.mayo

OT: Junk Science

...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Sy...
31 comments posted 11yrs
posted by To-Email-Use-The-Envelope-Icon
31 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

Robotics and electronics Blog

Hi All, Please go check out my blog which relates to Robotics and Electronics. http://killerrobotics.me/ Thanks
3 comments posted 11yrs
posted by jamesvdberg
3 comments posted 11yrs posted by jamesvdberg

Circuit design needed

I need to build an inexpensive circuit to open and close a 3volt DC power source at about 15 minute intervals. The circ...
5 comments posted 11yrs
posted by markmartino2
5 comments posted 11yrs posted by markmartino2

Minimum component efficient voltage regulator

Hi, I'm playing with AVR microcontrollers (I'm more a software/digital person). I'm after a simple efficient on-a-chip...
17 comments posted 11yrs
posted by tw_usenet
17 comments posted 11yrs posted by tw_usenet

OT: Photoeye

Where can I find a simple "photoeye" device that works by shining on a reflector and simply operates a relay when the b...
6 comments posted 11yrs
posted by To-Email-Use-The-Envelope-Icon
6 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

book?

Hi, I seek recommendations for an introductory text on optics. I have an engineering degree, but no coursework in the s...
5 comments posted 11yrs
posted by mark-t2
5 comments posted 11yrs posted by mark-t2

One-shot triggered rising and falling?

Hi all, I'm sure someone has an quick answer for this. I'd like a simple circuit or a part that produces a pulse -- bas...
14 comments posted 11yrs
posted by c.difficile
14 comments posted 11yrs posted by c.difficile

Math Problem

A math problem over my head... Would some math whiz solve this for me? Thanks! ...Jim Thompson -- | James E.Thompson |...
10 comments posted 11yrs
posted by To-Email-Use-The-Envelope-Icon
10 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon

What does this circuit do?

If anything. http://reliablehomeenergy.net/wp-content/uploads/2015/03/scheme.png They claim that $49 for instructions,...
20 comments posted 11yrs
posted by perilmung
20 comments posted 11yrs posted by perilmung

dead unused NiMH AA cells

I recently opened a pack of NiMH AAs that I'd had lying around for a while, & some of them wouldn't charge at all. I tr...
6 comments posted 11yrs
posted by a24061
6 comments posted 11yrs posted by a24061

RE-Tube amp questions

Thanks everyone for your answers. I guess I can see some of the reasons why tube amps tend to be low power. I am going...
19 comments posted 11yrs
posted by etpm
19 comments posted 11yrs posted by etpm

OT: RC Analog Servo?

I'm not up-to-date on RC servo's. Where might I get... ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovati...
12 comments posted 11yrs
posted by To-Email-Use-The-Envelope-Icon
12 comments posted 11yrs posted by To-Email-Use-The-Envelope-Icon