Hobby Electronics Basics

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IC LM317T

I'm currently troubleshoot a UPS (Uninterruptible Power Supply), for your information, I already replaced 4pcs of Power...
1 comments posted 20yrs
posted by kengloong
1 comments posted 20yrs posted by kengloong

USB hub boost input voltage

What is that circular socket on USB hubs for? A power boost? By USB hubs I mean the ones that turn one USB socket into...
2 comments posted 20yrs
posted by jidanni
2 comments posted 20yrs posted by jidanni

Wiring consistency check

I got a pcb-layout from a magazine, but since I've only got veroboards at home I had to relayout it to fit a veroboard....
10 comments posted 20yrs
posted by bos
10 comments posted 20yrs posted by bos

Couple of noob questions

Hi all, I've gotten into electronics thanks to a class I'm taking (only took until grad school to find out that I enjoy...
28 comments posted 20yrs
posted by dlenski
28 comments posted 20yrs posted by dlenski

making a 220v extension cord for my welder

Hi All, Need your input on the extension cord that I made for my welder (Lincoln squarewave 175). I did my reseearch on...
2 comments posted 20yrs
posted by tomsy01
2 comments posted 20yrs posted by tomsy01

Battery voltage as indicator of charge level

Is no-load voltage a reliable indicator of charge condition ? Are there universal voltage levels for a particular type...
4 comments posted 20yrs
posted by pjdd
4 comments posted 20yrs posted by pjdd

mobil phone conversion

I have a southwestern bell truck telephone and I want to convert it to CB use. What do I need to do to change it? Can I...
1 comments posted 20yrs
posted by clannorm
1 comments posted 20yrs posted by clannorm

Help Building a battery pack

Hi, I built a 7.2 V battery pack using two rechargeable 3.6V dc batteries. They eventually died and I purchased some di...
6 comments posted 20yrs
posted by electronics.z.optimizerone
6 comments posted 20yrs posted by electronics.z.optimizerone

Arc detection

Redirect appreciated if needed. How does an arc fault circuit interruptor work? What does it do in order to detect an a...
4 comments posted 20yrs
posted by quakeserver149
4 comments posted 20yrs posted by quakeserver149

Build your own calculator

Hello, I would like to build my own calculator. I am trying to build the most basic calculator that can simply add and...
2 comments posted 20yrs
posted by bbobbage
2 comments posted 20yrs posted by bbobbage

Help to transmit data with Radiometrix chip

I bought the receiver and transceiver from Radiometrix (tx1-173.250-10), and I need to transmit serial data through thi...
0 comments posted 20yrs
posted by brunomusw
0 comments posted 20yrs posted by brunomusw

LED Christmas Lights Question

Hello, I purchased several sets of Noma LED Faceted C7 - 50 light sets to decorate a large tree I have. I realize these...
1 comments posted 20yrs
posted by frredthecat
1 comments posted 20yrs posted by frredthecat

basic query

Can I use 6v DC relay as a switch in the circuit that passes 240volts. relay 6v 240 ac vol ------/ ----------| |--------...
2 comments posted 20yrs
posted by raghuyadav77
2 comments posted 20yrs posted by raghuyadav77

Help needed for simple robot control circuit

I'm working on the circutry for a fairly simple robot, and I think I've figured out most of it, but there's one bit tha...
9 comments posted 20yrs
posted by peter.mackenzie
9 comments posted 20yrs posted by peter.mackenzie

Clarification on RMS and frequency

Hi, As I understand it, RMS is calculated on the area under the sine or cosine wave for the AC supply and the peak volt...
14 comments posted 20yrs
posted by newspaper.20.broom
14 comments posted 20yrs posted by newspaper.20.broom