Hobby Electronics Basics

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Naked PC power supply

I am trying to get some PC power supplies to work with no computer attached. I know they won't start without a load so...
8 comments posted 21yrs
posted by jalbers
8 comments posted 21yrs posted by jalbers

Datasheet writing Software

Hi all, I want to write datasheet for a product. Is there any software support typical datasheet writing? Any suggestion...
18 comments posted 21yrs
posted by zhushenli
18 comments posted 21yrs posted by zhushenli

How to reverse resistance?

I have a (fuel level) sender that changes resistance from 0 Ohm (empty) to 90 Ohm (full). Fuel gauge, however, expects...
18 comments posted 21yrs
posted by peter
18 comments posted 21yrs posted by peter

What is the difference ?

Hi Good morning to group member.Can any member help me. I brough a hobby kit to build a 20 watts flourescent light by c...
5 comments posted 21yrs
posted by mowhoong
5 comments posted 21yrs posted by mowhoong

CMOS/CCD image Sensor?

Hi all, Is there any low cost color CMOS/CCD sensor support CIF(352*288) and YUV output? My friend recommend Omnivision...
2 comments posted 21yrs
posted by zhushenli
2 comments posted 21yrs posted by zhushenli

luxeon emitters

can you get away with running 3 luxeon emitters in series from a 12V supply? I know that 12V means 13-14V in practice,...
5 comments posted 21yrs
posted by news4
5 comments posted 21yrs posted by news4

Share negative between two power supplies?

I have a small 12VDC (130mA) fan that will normally be powered with an AC adapter. However, sometimes I want to be able...
8 comments posted 21yrs
posted by tylernt
8 comments posted 21yrs posted by tylernt

Help with simple LED sequence

Hi all, I want to make 4 LED's light up in the following sequence (looping): O O _ _ _ O O _ _ _ O O O _ _ O O O _ _ _...
37 comments posted 21yrs
posted by consultec
37 comments posted 21yrs posted by consultec

How to detect power cutout for PC?

I need a circuit that can detect when electricity goes out and sends a signal to the serial port of my PC, so that a pr...
57 comments posted 21yrs
posted by emre.sevinc
57 comments posted 21yrs posted by emre.sevinc

Maximum current draw from a battery

I have 2 12v 12ah lead acid batteries from an old scooter. They say they are 20 hour batteries on them. does this mean I...
3 comments posted 21yrs
posted by ngdbud
3 comments posted 21yrs posted by ngdbud

Inverter Fuses - Amps and VOLTS?

Maybe someone could give me a definitive answer on this: In my car I was using a 300-watt power inverter which provides...
9 comments posted 21yrs
posted by nospam
9 comments posted 21yrs posted by nospam

Switch on thump

I have a guitar pre-amp and separate power amplifier . When the power amp is already on for a while , should I then pow...
6 comments posted 21yrs
posted by sorry.spam
6 comments posted 21yrs posted by sorry.spam

Help on tranceiver design

Hi. I want to design a circuit to transmit binary data(NRZ) from one point to another by Frequency Shift Keying or any...
5 comments posted 21yrs
posted by sourav83
5 comments posted 21yrs posted by sourav83