Hobby Electronics Basics

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little math help on schematic

I would like to see the math involved in calculating the current in the 4k resistor and the current in the 12k resistor...
19 comments posted 21yrs
posted by rspinks1
19 comments posted 21yrs posted by rspinks1

ascii dwg

I have a question I'd like to pose and I would like to draw the schematic here so as to communicate the problem. Can som...
4 comments posted 21yrs
posted by rspinks1
4 comments posted 21yrs posted by rspinks1

Schematic drawing program

I'm a little confused with the results I'm getting when I do a search on Google for this. Perhaps someone here can help...
5 comments posted 21yrs
posted by photosail
5 comments posted 21yrs posted by photosail

Anyone used ExpressPCB?

I read a lot in this group about making your own PC boards, but as near as I can tell by the time I buy blanks, echant,...
4 comments posted 21yrs
posted by tom.horsley
4 comments posted 21yrs posted by tom.horsley

How are PCB's made?

Hi guys: How are copper clad pc boards made? Is the copper somehow electrodeposited onto them, or is it a glued down foi...
3 comments posted 21yrs
posted by eromlignod
3 comments posted 21yrs posted by eromlignod

FM transmitter

Hi.So I try several years to build a smal FM transmittet. I built mani small transmitters, but no one of them can't wor...
4 comments posted 21yrs
posted by slav4o_1
4 comments posted 21yrs posted by slav4o_1

power comsumption in RJ45 jacks with common mode

I am taking over a design that I don't know too much about. It's a network card that has an RJ45 jack with integrated m...
3 comments posted 21yrs
posted by josepugmima
3 comments posted 21yrs posted by josepugmima

Repair of a portable computer battery pack

Hi, I'm writing from a Gericom Webshox portable computer of 2001, now the battery pack ( UN241S1 Rechargeable Li-Ion Ba...
1 comments posted 21yrs
posted by etantonio
1 comments posted 21yrs posted by etantonio

My PC speakers are too soft

My PC speakers are too soft We have a new XP PC. Lots of RAM, HD and 3 GHZ Intel CPU. But we can barely hear the sound...
20 comments posted 21yrs
posted by kimshapiro100
20 comments posted 21yrs posted by kimshapiro100

Socketed Chips

Does anyone have an idea on whether or not socketed chips are still in widespread use, and if so, whether or not the ne...
9 comments posted 21yrs
posted by Searcher7
9 comments posted 21yrs posted by Searcher7

Digital resistor substitution?

Working on a circuit to control a refrigeration compressor speed. The speed is set by a resistor in the thermostat circ...
6 comments posted 21yrs
posted by gashmore
6 comments posted 21yrs posted by gashmore

Looking for scematic for simple motion detector

I am looking for a schematic for a simple motion detector. It needs to be powered by 6vdc to 12vdc. I am going to conne...
7 comments posted 21yrs
posted by <elehman1
7 comments posted 21yrs posted by <elehman1

Simple Question

I want to build a simple cable that will mute the speakers on my computer when i plug in headphones. I guess i can do i...
2 comments posted 21yrs
posted by christopher.lewis
2 comments posted 21yrs posted by christopher.lewis

Simply question

I want to build a simple cable that will mute the speakers on my computer when i plug in headphones. I guess i can do i...
12 comments posted 21yrs
posted by christopher.lewis
12 comments posted 21yrs posted by christopher.lewis

Flip Flop madness

Maybe I am working under a misconception but I have tried everything and can't seem to get this to work. The problem I...
4 comments posted 21yrs
posted by gashmore
4 comments posted 21yrs posted by gashmore