Hobby Electronics Basics

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Countdown Timer to Turn Off Device

I'd like to attach such a timer (Subject) to a heater and set it for say 30 minutes. At that time, it would turn off th...
16 comments posted 19yrs
posted by wolf_tracks
16 comments posted 19yrs posted by wolf_tracks

difference amplifier input

I was reading up on op amp difference amplifiers http://www.analog.com/UploadedFiles/Application_Notes/9710169AN692_a.p...
7 comments posted 19yrs
posted by kellrobinson
7 comments posted 19yrs posted by kellrobinson

Frequency vs Phase modulation

I was just sitting here ruminating, and remembered something I'd read in some Ham magazine a millennium ago, about how...
5 comments posted 19yrs
posted by rich
5 comments posted 19yrs posted by rich

Input Voltage drops when use 7806

Hi, I have created simple oscilloscope circuit taken from magazine, when I use 6V battery (4 pcs AA type), the input vo...
6 comments posted 19yrs
posted by yanto2000
6 comments posted 19yrs posted by yanto2000

6V to 3V without a regulator

I want to "wall-wart" power a 3V battery operated device (2 C cells). The device is decorative LED display controlled b...
7 comments posted 19yrs
posted by N
7 comments posted 19yrs posted by N

emitter followers / Darlington - need help

Hello, I'm trying to use a low-voltage signal from my PC's parallel port (< 5V) to activate the gate of a mosfet, which...
23 comments posted 19yrs
posted by mrdarrett
23 comments posted 19yrs posted by mrdarrett

Digital display for pressure sensor help needed

I want to build a cuircut that will digitaly display air pressure (0-200+ PSI) from 4 or 5 different sources on one sma...
5 comments posted 19yrs
posted by erikred7
5 comments posted 19yrs posted by erikred7

1-in-4 sequencer freezes up--a noise problem?

I have a 1-in-4 sequencer (a Forest Mims circuit) that turns 1of 4 LED's on in a sequence over and over. I have the out...
25 comments posted 19yrs
posted by ehsratcliffe
25 comments posted 19yrs posted by ehsratcliffe

electrical interface problem LVPECL - LVDS multi-inputs

Hi there, I'm currently having a serious problem: I got an LVPECL clock synthesizer and I want to connect it to several...
4 comments posted 19yrs
posted by diebombeausdemwesten
4 comments posted 19yrs posted by diebombeausdemwesten

radio telemetry beginner

I need some tutorial for radio telemetry (free frequency, modulation ..., range) i am beginner in radio comunication, ne...
1 comments posted 19yrs
posted by hiroc13
1 comments posted 19yrs posted by hiroc13

Kenwood swc

What is a Kenwood SWC-1 and what is the color code on the cable? Thanks, AL
0 comments posted 19yrs
posted by w6wqc
0 comments posted 19yrs posted by w6wqc

Driving Dual MOSFETs From A NPN Transistor

Hi, I'm working on a circuit that uses a NPN transistor to drive (i think that's the right word) two MOSFETs. Could som...
27 comments posted 19yrs
posted by mqiqcqhqaqeqlqhqiqmqsq
27 comments posted 19yrs posted by mqiqcqhqaqeqlqhqiqmqsq

lamp ballast

Why is the power supply for a fluorescent lamp called a 'ballast'? Ballast is used to modulate bouyancy in submarines. W...
12 comments posted 19yrs
posted by r_delaney2001
12 comments posted 19yrs posted by r_delaney2001

How to make my transmitter and receiver circuit?

How to make my transmitter and receiver circuit? HI everyone!! any one hav idea how to make a simple transmitter and re...
2 comments posted 19yrs
posted by srvenkatraman
2 comments posted 19yrs posted by srvenkatraman

DPAK and D2PAK power dissipation

Hi everyone, I am trying to figure out which is the best way to make a GND plane act as power dissipation area for a DP...
22 comments posted 19yrs
posted by follia77
22 comments posted 19yrs posted by follia77