Hobby Electronics Basics

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How to measure mA draw?

Hi all, Have a newbie question for you. I have this burglar alarm that has some very specific current draw requirements...
9 comments posted 19yrs
posted by addiebspamnot
9 comments posted 19yrs posted by addiebspamnot

noise from mux-ing 7-seg displays

I have a 4 digit 7-segment display that I mux through a MPU (illuminate one digit, wait a couple ms, go to the next dig...
9 comments posted 19yrs
posted by none
9 comments posted 19yrs posted by none

Is there any diffrence ?

I am trying out a self made high voltage ferrite transformer for insect killer (mosquito),according to the mannal, the...
2 comments posted 19yrs
posted by mowhoong
2 comments posted 19yrs posted by mowhoong

Unindentify optocouple

I need to replace some optocouple ( round shape plastic casing ). The optocouple which trigger a triac and control by a...
2 comments posted 19yrs
posted by mowhoong
2 comments posted 19yrs posted by mowhoong

LED side marker lamps

Hi all, I am replacing the old bulb type side marker lamps on my trailer with the new LED ones. I purchased a tridon 2...
6 comments posted 19yrs
posted by bardenator
6 comments posted 19yrs posted by bardenator

cellphone vibration detection?

No, I'm not looking to set off bombs, but I was wondering if I could redesign this ridiculous thing: http://home.att.ne...
1 comments posted 19yrs
posted by tom.horsley
1 comments posted 19yrs posted by tom.horsley

Marchand balun in microstrip circuit design

Can anyone tell me a good book or reference that helps me out in marchand balun design. Where all it is used and what f...
1 comments posted 19yrs
posted by yttoh.etis
1 comments posted 19yrs posted by yttoh.etis

555 timer DSLR time lapse shutter release

I've tried to use a Velleman timer kit for time-lapse photography with my Pentax DSLR camera but the single relay outpu...
6 comments posted 19yrs
posted by dave
6 comments posted 19yrs posted by dave

current output vs voltage output

Hi, I would like to know why some DACs have current output instead of voltage output. Is there any advantage with one or...
6 comments posted 19yrs
posted by axr0284
6 comments posted 19yrs posted by axr0284

great pcb design software

I came across this pcb design software that I just finished a project with and found pleasant, www.diptrace.com -- When...
2 comments posted 19yrs
posted by pedroatncfdotca
2 comments posted 19yrs posted by pedroatncfdotca

want to know about transistors

Hello! every body, my name is prashant and i'm in BE Electronics Engineering, I want to know about the capacitance betw...
0 comments posted 19yrs
posted by prashant.h.tandel
0 comments posted 19yrs posted by prashant.h.tandel

cw vs pulsed power

Could someone explain to me if there is a rule of thumb to determine the peak pulsed power of an (linear class a/b) RF...
5 comments posted 19yrs
posted by pat.robertson
5 comments posted 19yrs posted by pat.robertson

Designing Current circuit for 64 leds

Hi everyone Dealing with leds..I have few questions.I am trying to make matrix of 64 leds,common anode and darlington p...
2 comments posted 19yrs
posted by m.mounteverest
2 comments posted 19yrs posted by m.mounteverest