Electronics Forum / Basics / November 2006

Dimmer circuit for dc?
                                           12v
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I want to build an AM radio receiver by myself.
My question is: what is the right amplification that the first RF amp stage
should have ?
Is there any rule ?

I was looking to bu ysome solder braid from Digikey, There are many
shape and companies making them , anyone in particular that is
recommended and to stay away from ?
Chemtronics, Easy Braid , ...  color ? would that affect anything

I just started to play with wireless transmision. I used this kit that
I ordered:
http://www.rentron.com/remote_control/TWS-8-bit-combo.htm
I do get a signal  at the receiver but I do not know how to interpret

Anyone out there has experience to connect I2C devices with diferent
voltages, 3.3v and 5v respectively? I'm working on a project with
MCU(3.3v) to control three devices, one is 3.3v, other two are 5v, I
have trouble to get it work. my question are:

Hey all;
I'm driving a 2222 transistor with the 5v output high from a 4049 inverter.
I'm not sure which figure to refer to on the data sheet regarding how much
current I can safely draw from it though. I was hoping to use a 1-3k

I received this TWS-434A/RWS-434 8-Bit RF Combo Package and been
playing with it. I am  sending and receiving using pics.
My sending signal somewhat differs with my receiving signal. I hook up
both signals on the oscilloscope and I get this clear but different

I'm looking for an extremely compact thermostat for a 12-volt project.
It should have a temperature display on it, and the ability to activate
a 12-volt heating element when the temperature falls below a certain
point.

I'm getting small face tanning flourescent light bulbs.
Just the bulbs no ballast.  How do I know what kind of ballast to get
for them? (15 watts each, 4 bulbs).
How do I know how to connect the wiring?  And what type of ballast?

could anybody recommend am radio soldering  kit for 15 y. old ? It
shouldn't be a primitive one which I see everywhere.
thanks.

I built this circuit a little while ago and never got a chance to test
it:
http://www.uoguelph.ca/~antoon/circ/vps.htm
i di dsome test and something i do not understand is happening.

Can you please help me out with a few answers about modified nodal
analysis.
I have read the book by Kishore Singhal and Vlach.
1. Does MNA(modified nodal analysis) solve non-linear circuits too?

1. Hi guys! i noticed that every countries have their different
voltages supply..in my country we used 220volts other countries used
120volts... im just confused can u pls enlighten me...what is more
economical to used 120v or 220v? advantages & disadvantages using 120V

I'm getting small tanning flourescent bulbs.....
How do I know which ballast to get?  How do I wire a ballast to
flourescent bulbs?
All I'm getting is just the bulb.  I'm putting a total of 16 together

I would like to know if anybody tried these power supplies? they are
very cheap,  but are they any good.
http://www.abra-electronics.com/catalog/power_supply/abra.html
ken