Hobby Electronics Basics

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battery power supply

I would like to build a portable power supply for a 11" digital picture frame. The 9volt supply would need to last 6 ho...
5 comments posted 18yrs
posted by osbo47
5 comments posted 18yrs posted by osbo47

transformer resistances

I have an transformer from a old power supply. It has 2 red wires and 2 yellow wires. I think the red wires are the hig...
11 comments posted 18yrs
posted by dav1d
11 comments posted 18yrs posted by dav1d

resistance of various metals

I have seen charts that show how the resistance of various metals compare. What I haven't seen is a way to make determi...
4 comments posted 18yrs
posted by 1qazse4
4 comments posted 18yrs posted by 1qazse4

Please explain about UTP/FO

When I read about home automation in wikipedia. I found that the transmission medium for ethernet and IEEE1394 was UTP/...
3 comments posted 18yrs
posted by aungkokothet
3 comments posted 18yrs posted by aungkokothet

Help: Making Electrical Contacts

Can anyone direct me to a materials chart for referencing materials for electrical contacts?(Providing something like t...
12 comments posted 18yrs
posted by Searcher7
12 comments posted 18yrs posted by Searcher7

Automatic Wind for Mechanicl Clock using solonoid?

I have an old clock (30 day windup) I want to power with a weight that automatically raises a couple inches every 4 hou...
4 comments posted 18yrs
posted by wrongaddress
4 comments posted 18yrs posted by wrongaddress

Simple phase-shifter?

Hi guys: I know there must be a super-simple way to do this, but I keep getting caught up in PLL stuff. I have a simple...
9 comments posted 18yrs
posted by eromlignod
9 comments posted 18yrs posted by eromlignod

Store Li-ion batteries at 40% charge?

I've often seen the recommendation to store li-ion batteries at 40% charge for maximum life. Wikipedia states "However,...
1 comments posted 18yrs
posted by martinrubenstein
1 comments posted 18yrs posted by martinrubenstein

a basic dc power supply question

hi all, if a device ( in this case a 12V LCD screen for a car installation ) is rated 600mA can you use a power supply...
4 comments posted 18yrs
posted by calfran
4 comments posted 18yrs posted by calfran

Anyone Needing a 68HC11 Based Board?

I'm switching to a new project with new needs. I have a Mekatronix MRC-11 which is 68HC11 based. You can look at the in...
1 comments posted 18yrs
posted by nwmomike
1 comments posted 18yrs posted by nwmomike

Way to revive tired gel-cell batteries?

I have acquired some 12v gel cell batteries, some of which have been left in an almost discharged state for several mon...
2 comments posted 18yrs
posted by JakeD
2 comments posted 18yrs posted by JakeD

PIC Project

Any PIC users in Palmerston North or Ashhurst New Zealand ? Need help on a very small project. Thks Charlie
1 comments posted 18yrs
posted by railroads
1 comments posted 18yrs posted by railroads

Putting Red LED's In Osram Dot it light

I want to put 16,000 mcd red LEDs in an Osram Dot it light for working outside when I don't want my night vision affect...
15 comments posted 18yrs
posted by the1930s
15 comments posted 18yrs posted by the1930s