Electronics Forum / Basics / July 2008

Are there any schematic capture/board layout applications available
for Windows that don't cost an arm and a leg, yet are reasonably
functional?
EasyPCB is the only one I'm familiar with, but I'd rather have

What capacitor should I use on my AC adaptor to boost 4.5 voltage to 5 volt or a
resistor to get it from 6 volt?
I know the theory but I would rather not test it on my ipod;-)
Thanks,

I want to solder one TQFP144, but do not have
any experience with anything more than DIP40.
This is what I'm planning to do. I will:
1. apply some tinnol on all the pins on the PCB

I have a RS small Optimus speaker (stereo pair). It operates on four AA
batteries. I plugged the powered speaker into my CC Crane radio's headphone
jack, and it easily played the music at various volumes. I then took it to
an elder neighbor's house to attach it to his TV. He's ...

Does anyone know what probes will work with the Heathkit IO-4105
scope? Its a 5mhz scope. Would 100MHZ probe work?
Thanks

I have a radio control transmitter that controls my r/c planes.
I also have a Simulator program ( FMS ) that allows r/c people to train to
fly before crashing too often!  Ha !!
The FMS simulator program works fine on my VISTA  notebook computer with a

I think that the AC in Europe is 220. Can't I just wire up something
from the outlet like oneside and the ground for 110 VAC.
Thanks
Rick

I need to have a 4-layer board made, a prototype, 2 boards, nothing fancy.
I did some research in this newsgroup and I narrowed it down to Sierra Pro
Express, ExpressPCB, and AC Advanced Circuits.  Do you think I made the
right choice?  Do you have any recommendations?  I would ...

I am moving into a home which was built in the late 1800s where
brownouts are common and no grounds are available on the outlets.  I
will not have the option of rewiring the home.
Does anyone have suggestions as to how I can best protect my home

http://en.wikibooks.org/wiki/Practical_Electronics/Resistors
So does R2 mean 0.2 ohms?  (0,2 ohms for those of you east of the
Atlantic)
Michael

If a circuit just calls for something like a 1 Ohm resistor, with no other
info, would it be bad to use a Current Sensing resistor there?  
What would be the best way to approach looking up one to get, when no other
info is oprovided at to type or brand?  

hai
i am using LM393 as output ON and OFF
It is showing ,the output will be ON at 12.2V input voltage and the
output will OFF at 10.9V input voltage at normal room temperature

What would be an easy way to turn on a relay by a digital signal. The
relay would be hooked to a 220 V AC device.

Is it possible to have a purely-analog chip that stores audio without
using any form of sampling?
If an audio cassette does not require sampling then why would an analog
audio chip?

Has anyone used the Analog Devices AD5301 DAC?  I'm trying to use it to
output a variable voltage based on an operator selection but can't get
anything out of the DAC.
I have confirmed the correct command sequence going into the chip with a