Hobby Electronics Basics

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Laptop AC Adapter with fluctuating DC output

I have a dell laptop that won't power on or charge the battery but ran fine on battery until the battery lost its charg...
5 comments posted 19yrs
posted by slider123456
5 comments posted 19yrs posted by slider123456

Designing a powersupply for DVD-player

I have a DVD-player (standalone player from Philips, called DVD963 SA) where the powersupply has died. This is a great...
5 comments posted 19yrs
posted by news
5 comments posted 19yrs posted by news

Is this practical?

My neighbor and I were talking the other day about the frozen pipes in his shop. This is because he didn't insulate eno...
34 comments posted 19yrs
posted by etpm
34 comments posted 19yrs posted by etpm

Hobby electronics projects-- fire safety?

I'm a newbie to electronics, but I've come up with a project to cool a closed electronics cabinet. It uses an ac-dc 12V...
15 comments posted 19yrs
posted by etravenio
15 comments posted 19yrs posted by etravenio

Newbe needs help MOSFETs and PCB

Greetings everyone, I am a rank amateur with electronics. I have found a Battery Isolator schematic at Discover Circuit...
2 comments posted 19yrs
posted by "dhapp-at-wmis,net"
2 comments posted 19yrs posted by "dhapp-at-wmis,net"

Analog Switch question

Hello I have an analog switch question. For this example, I would like to use Texas Instrument's TS5A3159A SPDT Analog...
9 comments posted 19yrs
posted by mr.whatever
9 comments posted 19yrs posted by mr.whatever

building an H-bridge

Could four of these TRIACs be used to build an H-bridge? http://www.mouser.com/search/ProductDetail.aspx?R=Z00607MA_1BA...
7 comments posted 19yrs
posted by mrdarrett
7 comments posted 19yrs posted by mrdarrett

Q: Transistor as a switch with pull down ?

Hi all. I am interfacing an PIC microchip to a relay by using a normal NPN transistor. The relay is connected between +...
13 comments posted 19yrs
posted by benjamin.soelberg
13 comments posted 19yrs posted by benjamin.soelberg

electromagnet winding

hello I am winding an electromagnet with some 29awg magnetic wire. I want to make to electromagnet with the same streng...
3 comments posted 19yrs
posted by lerameur
3 comments posted 19yrs posted by lerameur

Why use a transistor to drive a motor?

Hi, I was looking at the following circuit: http://static.flickr.com/56/145174497_d31b603880.jpg and I was wondering wh...
8 comments posted 19yrs
posted by mentalray
8 comments posted 19yrs posted by mentalray

Good Semiconductor IC / Bad semiconductor IC?

When it comes to memory ICs, made by different manufacturers, can there be a low quality IC and a high quality IC.
5 comments posted 19yrs
posted by titani
5 comments posted 19yrs posted by titani

LED Reverse Voltage

Is there any problems with applying a reverse V that is
4 comments posted 19yrs
posted by jecottrell65
4 comments posted 19yrs posted by jecottrell65

who manufactures these flash memories?

Who manufactures SD, miniSD, and microSD memory? These memories are sold under many names, yet I am trying to find a man...
10 comments posted 19yrs
posted by titani
10 comments posted 19yrs posted by titani

Why am I so bad with op amp calculations?

Hello all.. I have this circuit: http://bayimg.com/aAclCaabB It's just a basic summer circuit in single supply mode. I...
9 comments posted 19yrs
posted by mr.whatever
9 comments posted 19yrs posted by mr.whatever