Hobby Electronics Basics

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urgrent help needed: 8051 microcontroller project

my Project based on 8051 microcontoller i have to sense temperature then store the result in pc & dispLAY it on 7-seg....
3 comments posted 20yrs
posted by gagancool83
3 comments posted 20yrs posted by gagancool83

RCA 4501 Photomultiplier tubes

I have a pair of old RCA 4501 PMT's I would like to use. They were salvaged from a LS unit and appear to be in good sha...
2 comments posted 20yrs
posted by hbarwood
2 comments posted 20yrs posted by hbarwood

Car Chargers Keep Blowing Out

I got SIRIUS satellite car kit which plugs into the electrical outlets in my Honda Accord (2004) and the first one died...
6 comments posted 20yrs
posted by jeffy3
6 comments posted 20yrs posted by jeffy3

Resistive or inductive load and relay rating

I'm wanting to switch a 400W 240V electronic MH balast from a relay, and possibly a small switchmode 12V/5V supply from...
3 comments posted 20yrs
posted by nick
3 comments posted 20yrs posted by nick

LCD module on sale

Dear Madam/Sir: Glad to know you through the Internet! Are you in need of LCD products? SEAKO ELECTRONIC CO., LTD (HUAX...
1 comments posted 20yrs
posted by sophie_seako
1 comments posted 20yrs posted by sophie_seako

Capacitor V vs SV

What does SV mean on a capacitor? How does it differ from V?
10 comments posted 20yrs
posted by redaura
10 comments posted 20yrs posted by redaura

Soldering: Need Two More Hands(Part 2)

I'm in a *desperate* situation and really need a video of some sort showing the art of soldering. Six projects have hit...
11 comments posted 20yrs
posted by Searcher7
11 comments posted 20yrs posted by Searcher7

reading from printer port

hello I'm student of mechanical engineering. In a project I subjected with this problem : I want the computer to show i...
2 comments posted 20yrs
posted by shahin.gharagozlou
2 comments posted 20yrs posted by shahin.gharagozlou

Connecting bigger speakers to amplifer

My small Stereo says 4~16ohms by the speaker connections. I connected a larger speaker with a rated impedance of 8ohms....
14 comments posted 20yrs
posted by eswnl
14 comments posted 20yrs posted by eswnl

is this the place for a newbie question?

I have changed a 3 phase motor to operate as a stepper. I now want to control it from the printer port of my computer,...
2 comments posted 20yrs
posted by cstutt
2 comments posted 20yrs posted by cstutt

amperage question

I have a cpu fan which is rated 12v dc 0.06A can I run it in my truck or will it burn out?
10 comments posted 20yrs
posted by nospam
10 comments posted 20yrs posted by nospam

circuit to cause engine to run on briefly

This is for a waste-vegetable-oil diesel conversion. Before shutting down, you have to switch the engine over to "regul...
6 comments posted 20yrs
posted by kellrobinson
6 comments posted 20yrs posted by kellrobinson

Op amp noise from Inductors

Sorry for the double reply, but Google Groups isn't displaying this on their site because it associated the title with...
7 comments posted 20yrs
posted by pmlonline
7 comments posted 20yrs posted by pmlonline

Please help with OpAmp simulation problem!

I am taking a distance learning "lab" class in EE, using Multisim to simulate circuits at home. Unfortunately, e-mail c...
11 comments posted 20yrs
posted by null
11 comments posted 20yrs posted by null

Just to verify my reset circuit

My reset pin is active low, this would work right? Vcc |------- | | | - R10k 1N4148 | + | | |-------To reset pin | C10uF...
12 comments posted 20yrs
posted by vcteo1
12 comments posted 20yrs posted by vcteo1