Hobby Electronics Basics

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How to make strong magnets?

I would appreciate if anyone can advise as to how to make magnets. I have an electronic engineering background, but hav...
7 comments posted 21yrs
posted by siliconmike
7 comments posted 21yrs posted by siliconmike

phasors and power calcs

Hello, I am studying an introductory electronics course and have been given the following problem: A small factory has...
8 comments posted 21yrs
posted by jan
8 comments posted 21yrs posted by jan

Radio Tuning

Hi All Where or What is the formula to calculate Radio Frequencies? Variable Capacitor (I assuming) as the tuning dial,...
1 comments posted 21yrs
posted by brif8
1 comments posted 21yrs posted by brif8

tree from A0?

I've the A0 matrix for a graph of a network. _How to calculate the tree from A0?_ In my notes (very confused :-( ) from...
0 comments posted 21yrs
posted by gooliverNOSP
0 comments posted 21yrs posted by gooliverNOSP

YAP-II programmer

Hello, Has anyone here built the YAP-II from "Programming and customizing PIC Microcontrollers, Second Edition"? Specif...
0 comments posted 21yrs
posted by martinb
0 comments posted 21yrs posted by martinb

Help designing a latching electronic switch

Hi there I am a novice at electronics so please bear with me! I need to design a latching electronic switch with a mome...
28 comments posted 21yrs
posted by priv
28 comments posted 21yrs posted by priv

electrocution by car battery

Hi... Just a question running through my mind. I know that a 12volt car battery can't electrocute you. What if i pass i...
38 comments posted 21yrs
posted by johnlee80
38 comments posted 21yrs posted by johnlee80

Liquid level indicator

For my home brewery I need to know if a container has liquid past a certain level, and if it is, turn on a pump. Can an...
35 comments posted 21yrs
posted by mmcnospam
35 comments posted 21yrs posted by mmcnospam

Environment-resistor temperature

Hello to everybody, first of all sorry for my English (I'm Italian). I have a circuit, enclosed in a plastic box, where...
7 comments posted 21yrs
posted by msignorini
7 comments posted 21yrs posted by msignorini

calculating emitter stablizied biasing sat current

Hi all: I have a simple emitter stablized circuit. with Vcc = 12V, Rc = 2.2k, Re = 1.2k I did Vcc / (Rc + Re) to find t...
3 comments posted 21yrs
posted by kelvinchan604
3 comments posted 21yrs posted by kelvinchan604

Signal noise?

Hi, I am trying to troubleshoot a problem with an electro-dynamic shaker. There is a coaxial output from a computer to...
1 comments posted 21yrs
posted by davidd31415
1 comments posted 21yrs posted by davidd31415

safety of lead free solder

I had thought lead-free solder was considered safe. I was prepared to let a 12 year old begin soldering (under supervis...
16 comments posted 21yrs
posted by jdamja
16 comments posted 21yrs posted by jdamja

Help with picking a power supply

It has been a while since I was in school working with this stuff so maybe someone out there can help me in this area....
10 comments posted 21yrs
posted by macrorodNOSPAM
10 comments posted 21yrs posted by macrorodNOSPAM

Transformer replacement

Can I use 12V, 2amp centre tapped transformer in place of a 24V/2amp. I will not use the tapped wire, so I'll get 24volt...
3 comments posted 21yrs
posted by nospam4u_jack
3 comments posted 21yrs posted by nospam4u_jack

Wire Wrap

I would like to wire wrap some small hobby circuits. I figure 30AWG is correct for me. I see Digikey (http://dkc3.digik...
7 comments posted 21yrs
posted by no
7 comments posted 21yrs posted by no