Hobby Electronics Basics

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Help with simple DC motor

I need help in designing and simulating a circuit on PSIM/Matlab/ PSpice for a simple DC motor going forward/stop/rever...
6 comments posted 18yrs
posted by jatans
6 comments posted 18yrs posted by jatans

7-segment display problem

Hi all. I'm just starting out trying to get my head round this electronics thing and am building a few simple circuits...
3 comments posted 18yrs
posted by cooper.tim
3 comments posted 18yrs posted by cooper.tim

Easy Question - I Hope

First finally dropped the $$ on the big screen and as I live in TX, which typically has huge thunderstorms this time of...
27 comments posted 18yrs
posted by pinkFloyd43
27 comments posted 18yrs posted by pinkFloyd43

Walkie talkie operation

I have an inexpensive walkie talkie (under $50/pair). It receives FRB in 400 MHz and weather stations in 160 MHz region...
1 comments posted 18yrs
posted by rlewart
1 comments posted 18yrs posted by rlewart

alarm switch

I require alarm systems for both personal and house. From seeing various alarm projects, there is no detail about how t...
6 comments posted 18yrs
posted by kvsteve
6 comments posted 18yrs posted by kvsteve

digikey components

hello guys, I usually find the parts I am looking for on digikey web site. I have not order from there for a long time....
7 comments posted 18yrs
posted by lerameur
7 comments posted 18yrs posted by lerameur

Electric home heat system?

A guy I work with kept complaining that his breakers were tripping. I went over and put an amp meter each of the two ci...
8 comments posted 18yrs
posted by clannorm
8 comments posted 18yrs posted by clannorm

Optimum RC values for crystal oscillator?

I made a low frequency crystal oscillator using a couple CMOS inverters (CD4069) and a very old 31.5KHz crystal. It's a...
7 comments posted 18yrs
posted by wrongaddress
7 comments posted 18yrs posted by wrongaddress

Garage Door Alert

A friend of ours bought a garage door sensor that has two LEDs and a beeper that goes off when the door is first opened...
4 comments posted 18yrs
posted by jjdkcnjs
4 comments posted 18yrs posted by jjdkcnjs

Part Search

Hello, anybody has the datasheets for the following two parts: T25089 and MK50981N both of them should be TELEPHONE DTMF...
3 comments posted 18yrs
posted by lerameur
3 comments posted 18yrs posted by lerameur

Driving two transistors with same signal

Hi, I have two common anode 7-segments displays, and only one wire to drive them. I need to achieve the following : whe...
21 comments posted 18yrs
posted by news
21 comments posted 18yrs posted by news

Tips?

I have plans to assmble a SIMPLE Date-'clock' Basic parts being; CLOCK CHIP, DISPLAY DRVR, LED, LIGHT-CONVER. (power sou...
2 comments posted 18yrs
posted by boswell6
2 comments posted 18yrs posted by boswell6

DTMF from a pic chip

Hello, I finally got my circuit working... well almost. I use a pic chip with picbasic pro, I output DTMF and this goes...
3 comments posted 18yrs
posted by lerameur
3 comments posted 18yrs posted by lerameur

cc at powersupply

we r doing one project based on uc.we want 2 supply voltages one is 5v,and another is 3.3v.we r using adjustable voltag...
4 comments posted 18yrs
posted by swapnapriya2020
4 comments posted 18yrs posted by swapnapriya2020

radio eats batteries

I purchased an armband radio recently, for jogging. Truetech, if that means anything. I inserted 2 new alkaline AAA bat...
2 comments posted 18yrs
posted by r_delaney2001
2 comments posted 18yrs posted by r_delaney2001