Hobby Electronics Basics

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current limiter / voltage regulator question

Hello I need to deliver a variable current between 0-2 Amps to a small load (15 Ohms).... At first I was thinking about...
12 comments posted 19yrs
posted by panfilero
12 comments posted 19yrs posted by panfilero

Simple op-amp summing junction question

This question arose from the typical "what do I do to protect an op- amp when the input voltage is higher than supply?"...
2 comments posted 19yrs
posted by waynelittle
2 comments posted 19yrs posted by waynelittle

Transformer Help

I am looking to replace a transformer for a rechargeable razor which was plugged into 220V by accident, not me the kid....
6 comments posted 19yrs
posted by james.douglas
6 comments posted 19yrs posted by james.douglas

softwares: electronic circuits

Guys what r the good softwares that analyses circuits and which has got a good library of components....
11 comments posted 19yrs
posted by libintr
11 comments posted 19yrs posted by libintr

LED Array

I am interested in building an LED array with about 40 LEDs. They take 3.3 volts at 20mA. Does it make sense to make 20...
6 comments posted 19yrs
posted by ganjatoker
6 comments posted 19yrs posted by ganjatoker

Lighting up the inside of a subwoofer

Hey everyone, I am an undergrad in ECE and I am working on building the box for a double vented 500W subwoofer. I want...
12 comments posted 19yrs
posted by Jacob.Block
12 comments posted 19yrs posted by Jacob.Block

A single fault safe design for a LED

Please see http://anders.sagevik.com/beregninger.jpg for circuit details. I have a unit with 4 LED diodes (HFBR fiber o...
0 comments posted 19yrs
posted by gisly
0 comments posted 19yrs posted by gisly

A single fault safe design for a LED

Please see http://anders.sagevik.com/beregninger.jpg for circuit details. I have a unit with 4 LED diodes (HFBR fiber o...
4 comments posted 19yrs
posted by gisly
4 comments posted 19yrs posted by gisly

LED driving; MOSFETs or Transistors?

Hi all, I am new to this newsgroup but have been doing some back reading and this looks like a great resource. I hope t...
5 comments posted 19yrs
posted by jvonnieda
5 comments posted 19yrs posted by jvonnieda

My SAMSUNG Digimax V4000 wont switch on !!!!!!

Was working fine, but this morning it wouldn't switch on, even with new batteries. It is out of warranty. I believe it...
1 comments posted 19yrs
posted by NOspamMZBEG
1 comments posted 19yrs posted by NOspamMZBEG

voltmeter

I was just wondering if someone can recommend an inexpensive voltmeter that can measure the RMS voltage of a 70 MHz wav...
4 comments posted 19yrs
posted by mike7411
4 comments posted 19yrs posted by mike7411

Name that component!

Hi everyone, I'm looking for a component that would have three leads, is a switch in nature, and acts ultimately like a...
10 comments posted 19yrs
posted by james.merry
10 comments posted 19yrs posted by james.merry

Opto coupler

hello, I have bought the MCT6 chip (opto coupler) I grounded pin 3 and 5 If I put a voltage a cross pin 4 should I get t...
7 comments posted 19yrs
posted by lerameur
7 comments posted 19yrs posted by lerameur