Hobby Electronics Basics

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Explain odd digital clock behavior?

Greetings All, I have a digital clock that's at least 25 years old. I also have a machine shop that uses a rotary phase...
8 comments posted 17yrs
posted by etpm
8 comments posted 17yrs posted by etpm

Humidifier !

There are many china brand of humidifier found in the market. The purpose of the humidifier is to add water to the air...
3 comments posted 17yrs
posted by mowhoong
3 comments posted 17yrs posted by mowhoong

Garage door opener

The photocell at the bottom of the door; the emitter and the receiver are connected to the same 2 terminals. How does it...
2 comments posted 17yrs
posted by boobooililililil
2 comments posted 17yrs posted by boobooililililil

Fluorescent heating

Most fluorescent lamps emit light in visible range. Is it possible to build a fluorescent lamp that emits light in the...
37 comments posted 17yrs
posted by glucegen1x
37 comments posted 17yrs posted by glucegen1x

Increasing current handling of PWM motor controller

Hi, I have a nifty little motor controller for Arduino that can handle 12v DC motors up to about 1amp. I was wondering...
0 comments posted 17yrs
posted by kasterborus
0 comments posted 17yrs posted by kasterborus

ieee

send me jobs on ieee
4 comments posted 17yrs
posted by neelima.baghele5
4 comments posted 17yrs posted by neelima.baghele5

Replacement for BC557B and 547B which can handle 1 Amp

Hi All I'm busy changing an existing circuit, but requires equivalents to the BC557B and BC547B which can handle up to...
17 comments posted 17yrs
posted by linux.oracle.dba
17 comments posted 17yrs posted by linux.oracle.dba

Transformer winding insulation

Hello everyone, Am I correct in that the winding wire in a transformer is coated with a varnish that acts as an insulat...
18 comments posted 17yrs
posted by sbrehler
18 comments posted 17yrs posted by sbrehler

decoupling caps placement

Hey all; I've got a circuit that uses 3 4049 inverters. On this IC, the V+ is on pin 8 and the ground is on pin 1. I kn...
17 comments posted 17yrs
posted by toccata
17 comments posted 17yrs posted by toccata

robotix

Hi everyone I'm pleased to tell you that IIT Kharagpur will be hosting Robotix 09 this year on jan 29th. Robotix is one...
0 comments posted 17yrs
posted by rahul.d.dude
0 comments posted 17yrs posted by rahul.d.dude

Concept of Charge Density profile

Hello, I learned this from my electronics course. To turn on or turn off a transistor, you have to cater for the charge...
2 comments posted 17yrs
posted by jl
2 comments posted 17yrs posted by jl

really low power transistors

Anyone recommend any NPN transistors with around 0.1-0.3VBE sat. ? I did a mouser search but apparently Vbe sat. isn't a...
41 comments posted 17yrs
posted by mrdarrett
41 comments posted 17yrs posted by mrdarrett

Binary clock power consumption

hi i build a bcd clock shown in the page http://ourworld.compuserve.com/homepages/Bill_Bowden/clock.htm and all the cir...
2 comments posted 17yrs
posted by josegidayfin
2 comments posted 17yrs posted by josegidayfin