Hobby Electronics Basics

  1. Home
  2. Hobby Electronics Basics
9387 Threads Posts
to

Worth reading in Hobby Electronics Basics

4-20ma controls

Ive seen a lot of industrial controllers such as plcs and they all seem to use a signal of 4-20 ma in proportion to rel...
5 comments posted 21yrs
posted by cornytheclown
5 comments posted 21yrs posted by cornytheclown

5 Volt Supply

I am building a radio control remote for a camera requiring a 5Volt 13 m/a supply and using 4 x AAA Are any smaller bat...
5 comments posted 21yrs
posted by sirslhawks
5 comments posted 21yrs posted by sirslhawks

Efficiency of a transformer with increasing frequency

Why does the effciency of my low voltage transformer very much decrease (to eg 10%) when increasing the frequency to ar...
7 comments posted 21yrs
posted by charles.macleod
7 comments posted 21yrs posted by charles.macleod

A question about 555

I have seen in some analog circuits that if we need a 2.5 V supply there is way to do it that generate a 5V square puls...
5 comments posted 21yrs
posted by aman.bindra
5 comments posted 21yrs posted by aman.bindra

A question about capacitor

When I think of capacitor I can see there are two conducting parallel plates seperated by an insulator dielectric. So a...
13 comments posted 21yrs
posted by aman.bindra
13 comments posted 21yrs posted by aman.bindra

12 LED resistance circuit help

Hi, I want to make a simple LED circuit with 12 LEDs running off a nine volt battery. I've managed to dig up enough inf...
52 comments posted 21yrs
posted by Brilla
52 comments posted 21yrs posted by Brilla

Purpose of Modulator for a CATV Ampifier

I am going to install an amplifier to connect 8 TV in my home. The amplifier has a Cable-IN post, A DC12V Cable Pwr Pos...
0 comments posted 21yrs
posted by jgartley
0 comments posted 21yrs posted by jgartley

Parallel Port and VB part II

First, I would like to thank everyone who helped me with my initial post. Using your suggestions, I decided to use a th...
3 comments posted 21yrs
posted by zuckuss
3 comments posted 21yrs posted by zuckuss

4013 Flip Flop Toggle Start up

Hello- I am using a 4013 as a toggle to control a LED. Simple school project. I have Qbar connected to Data, Q is to a...
10 comments posted 21yrs
posted by aleve
10 comments posted 21yrs posted by aleve

Need help understanding how to use opto-isolator

I want to build an automatic garage door closer with an alarm clock and my garage door remote. I realize that I could j...
29 comments posted 21yrs
posted by crvmp3
29 comments posted 21yrs posted by crvmp3

Circuit Analysis Question

I am taking an electronic circuit analysis class via correspondence and one of the questions on the homework assignment...
6 comments posted 21yrs
posted by ndbarnes
6 comments posted 21yrs posted by ndbarnes

externalizing GPS antenna

Got a Garmin Etrex - I want to put it on a goat's collar. Track where they go all day. Since satellite acquisition thro...
2 comments posted 21yrs
posted by invalid
2 comments posted 21yrs posted by invalid

In Rush Current

I posted about a SBC P4 that randomly failed to boot (Power up) and want some ideas how to get accurate current measure...
5 comments posted 21yrs
posted by REMOVE AT-DOTrwskinnerAT
5 comments posted 21yrs posted by REMOVE AT-DOTrwskinnerAT