Hobby Electronics Basics

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when to use polarized caps

I was just wondering... when should I use polarized caps? What's the benifit here over a regular one? I'm setting up a...
48 comments posted 17yrs
posted by panfilero
48 comments posted 17yrs posted by panfilero

toyota camery electrical problem

the problem vehicle is a 1990 toyota camery. this problem occured after lightly(meaning i tried to stay away from the d...
2 comments posted 17yrs
posted by cai.jude.houston
2 comments posted 17yrs posted by cai.jude.houston

motor speed controller for kids' electric car

I've got an electric car for the kids that has only an On-Off switch for speed control. I was hoping to add a better sp...
60 comments posted 17yrs
posted by mrdarrett
60 comments posted 17yrs posted by mrdarrett

Open-collector

Hello, I read a web page about ps/2 mouse and keyboard protocol [1] with the intention of doing a few experiments with...
4 comments posted 17yrs
posted by none
4 comments posted 17yrs posted by none

Mystery voltage regulator

In a Siemens Gigaset cordless phone, a voltage regulator is defective. The phone is very similar to this picture: http:...
9 comments posted 17yrs
posted by not
9 comments posted 17yrs posted by not

Getting the Screen to Fit Left-Right

I have a 12-15 year old 27" Panasonic TV that we use with DirecTV. When I'm on Video 1, the left and right view are off...
1 comments posted 17yrs
posted by wolftracks
1 comments posted 17yrs posted by wolftracks

Tranformer question ?

I salavaged some step-down tranformer from pcb which has ac 220 volts input, ac 23 volts output. I want to use them in...
5 comments posted 17yrs
posted by mowhoong
5 comments posted 17yrs posted by mowhoong

What do the LED spec mean?

Apologies for asking such basic questions but Vf means forward voltage and that is the maximum voltage to be applied? T...
11 comments posted 17yrs
posted by biz
11 comments posted 17yrs posted by biz

Is this LED hookup correct?

I am a beginner and I would appreciate if someone confirmed that this is correct: There are 2 ways of hooking up a larg...
9 comments posted 17yrs
posted by biz
9 comments posted 17yrs posted by biz

Simple Telephone Circuit

Hello, My nine-year-old son is building an "old fashioned" telephone switchboard, where you have some phone extension b...
9 comments posted 17yrs
posted by tim
9 comments posted 17yrs posted by tim

Good place to buy MCU boards

Hi, I'm interested in MCU evaluation boards, and would like to buy in north America for faster shipping but more import...
4 comments posted 17yrs
posted by energymover
4 comments posted 17yrs posted by energymover

Breakdown voltage of PETG in Homemade Capacitor

I'm working on building a high voltage capacitor. I have heard that PET has a very high voltage breakdown. I came acros...
3 comments posted 17yrs
posted by ngdbud
3 comments posted 17yrs posted by ngdbud

Ideas for electromechanical resonance?

I'm wondering if anyone has done this and how: I want to resonate a high carbon steel bar at its fundamental frequency...
8 comments posted 17yrs
posted by default
8 comments posted 17yrs posted by default

elementary transfer function with ngspice

Hi, I am a spice newbie and I'd like to plot the transfer function V/I (f) . Here is the scheme : Transfer function : I...
2 comments posted 17yrs
posted by cedric_libre
2 comments posted 17yrs posted by cedric_libre