Hobby Electronics Basics

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Update-switching off car stereo speakers

Well, I decided to just try turning off the speakers without switching a resistor in at the same time because the stere...
1 comments posted 20yrs
posted by etpm
1 comments posted 20yrs posted by etpm

Portable battery charging in car

I have a small 12V lawn and garden battery that I can charge at home and take car camping for a couple of nights. I'm g...
3 comments posted 20yrs
posted by mhmiller48
3 comments posted 20yrs posted by mhmiller48

help with kids science project

Hi all, i'm new to the forum and need some help with my son's science fair project that I thought was going to be a no...
11 comments posted 20yrs
posted by rondog622
11 comments posted 20yrs posted by rondog622

Electronic parts

Hello, I am new to this group and I know next to nothing about electronics. But my 90 year old father, who just passed...
12 comments posted 20yrs
posted by cznative
12 comments posted 20yrs posted by cznative

What's wrong with this picture?

Trying to mess with an existing circuit to drive a stepper motor. I've got 4 "control" inputs (Take them to ground to t...
7 comments posted 20yrs
posted by dakidd
7 comments posted 20yrs posted by dakidd

Need help finding a couple parts

I am replacing a fuse holder in an audio amplifier and need to find a source for the following: 3.3 megaOhm resistor 10...
10 comments posted 20yrs
posted by tbone
10 comments posted 20yrs posted by tbone

Tiny Solenoid

X-No-Archive Hey, I'm new here and I hope I'm posting in the most relevant group. I'm looking for a way to create a tin...
12 comments posted 20yrs
posted by evsummers
12 comments posted 20yrs posted by evsummers

100Mhz Data Acquisition

We are seeking a compact/low-power Data Acquisition device for deployment in small sub ocean devices. We need to sample...
6 comments posted 20yrs
posted by sonnichs
6 comments posted 20yrs posted by sonnichs

circuit for separating ISDN from DSL

Hello newsgroup, we are three enthusiasted electronics amateurs and we got that idea into our heads to build our own sp...
2 comments posted 20yrs
posted by diebombeausdemwesten
2 comments posted 20yrs posted by diebombeausdemwesten

Infrared reflective sensor

Hi All, I'm looking for a part which provides an output signal when a reflective surface is placed in front of it. I'm...
7 comments posted 20yrs
posted by einenschatz
7 comments posted 20yrs posted by einenschatz

8:1 Multiplexer IC that's faster than 74HC151?

Hi, I am after an 8:1 multiplexer IC (in fact I have 6 inputs to route to 1 output) and the 74HC151 would be ideal, exc...
3 comments posted 20yrs
posted by me
3 comments posted 20yrs posted by me

LT Spice autotransformer

Just wondered if LT spice can be used to describe an autotransformer - and see the effects on its output with changing...
2 comments posted 20yrs
posted by dave
2 comments posted 20yrs posted by dave

Removing Gear Box from Dayton Gear Motor

I purchased a Dayton 5K942 gear motor. The motor had burned out--windings on one side. A friend took one look at it, an...
1 comments posted 20yrs
posted by wolf_tracks
1 comments posted 20yrs posted by wolf_tracks

spherical speaker enclosure

I remember reading somewhere that spherical enclosures are ideal shape..is that correct? debatable? Incidentally, I liv...
4 comments posted 20yrs
posted by suraj.joneja
4 comments posted 20yrs posted by suraj.joneja