Hobby Electronics Basics

  1. Home
  2. Hobby Electronics Basics
9387 Threads Posts
to

Worth reading in Hobby Electronics Basics

120V accurate current source - how?

I'm seeking opinions on the best way to generate an accurate current at 120V AC. I need to calibrate a power meter desi...
6 comments posted 21yrs
posted by kleptein
6 comments posted 21yrs posted by kleptein

Coaxial Audio Filter

Hi, I have a quastion to ask. It requires a bit of explanation so listen up! I have a very, very old television at home...
3 comments posted 21yrs
posted by mjdoyle
3 comments posted 21yrs posted by mjdoyle

household wiring

Hi, I am a bit confused about 240V/120V household wiring. If there are 3 phases on the big powerlines, ie. X Y and Z, a...
9 comments posted 21yrs
posted by jmorken
9 comments posted 21yrs posted by jmorken

GHz Oscope

If anyone has a GHz oscope laying around, and you will rent time on it to me, please email me. I'm in the South Bay area...
6 comments posted 21yrs
posted by letron_2000no__spam
6 comments posted 21yrs posted by letron_2000no__spam

design help needed

I want to build a preamp for my acoustic guitar, which will have a condenser mic and a few transducers as input. I woul...
56 comments posted 21yrs
posted by asleep
56 comments posted 21yrs posted by asleep

Need circuit to magnetize a magnet

I am a high school Physics teacher and I need a circuit to magnetize a magnet. Several years ago, I saw one in a book p...
13 comments posted 21yrs
posted by dabezinque
13 comments posted 21yrs posted by dabezinque

UL approval

I'm designing a smart home system, which will need to be UL approved. I never gone through this before, and have some q...
3 comments posted 21yrs
posted by notreal
3 comments posted 21yrs posted by notreal

lead acid battery charger design

What kind of circuit will reduce its output voltage as current into the load subsides? i.e. a battery charger with outp...
13 comments posted 21yrs
posted by kellrobinson
13 comments posted 21yrs posted by kellrobinson

Transistor H-bridge for bicolor LED?

I have a pile of 25 bi-color LED and I wanted to drive them all. I was thinking of using the H-bridge to control the di...
5 comments posted 21yrs
posted by impmon
5 comments posted 21yrs posted by impmon

Laser beam detector

I've been trying to build a circuit to detect if a light beam is broken falling on a CDS cell. I'm using the following...
6 comments posted 21yrs
posted by kasterborus
6 comments posted 21yrs posted by kasterborus

basic LED Blinker?

So I switched major from psychology to electrical engineering mid junior year. Yeah I'm crazy but so what. I'm really i...
3 comments posted 21yrs
posted by edhotchkiss
3 comments posted 21yrs posted by edhotchkiss

ballantine 1010a oscilloscope

Hello, I picked up a Ballantine 1010A this morning at a reasonable price. It appears to be functional, but the only pro...
6 comments posted 21yrs
posted by nospam
6 comments posted 21yrs posted by nospam

Hitachi TV power problem

Folks, Can anybody point me in the right direction? My daughter has a Hitachi model C1719T TV receiver with a problem....
4 comments posted 21yrs
posted by My.address
4 comments posted 21yrs posted by My.address

homebrew computer - where to start?

hi, i've been a dedicated computer nerd for about twelve years now. i started with a cast-off tandy "laptop" that ran B...
30 comments posted 21yrs
posted by racter
30 comments posted 21yrs posted by racter

[Q] basic electronics: Batteries

Hi all, I have a couple of basic questions on batteries. I only know very little about electronics, electricity, so ple...
11 comments posted 21yrs
posted by www_kk2
11 comments posted 21yrs posted by www_kk2