Electronics Forum / Basics / March 2006

   When reading descriptions on the operation of JFETs, I repeatedly
see mention of "pinch-off".  Some books on JFETs describe pinch-off
as the point that the drain-to-source voltage (Vds) is just high enough
so as not to affect the drain current if Vds happens to increase; while

In the voltage-current negative feedback,what is the value of the
negative feedback voltage of the output voltage?
It says that "Vref=Vo*Re1/(Re1+Rf)" in the text book,why is that?
Should I consider the output resistance of the emission pole of the

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I'm like to buy some of these; http://www.retro.dial.pipex.com/2pole.jpg
That's the 2 pole version, but ideally I'd like single pole.  It's 0.1"
pitch by the way just incase the image is deceptive.  I know the single pole
versions exist since I've seen them on my travels.  The ...

   I have just started playing with electronics, this was because my
brother needed a device to do a job and I figured I could do it with a PIC
and a few components and modifying an existing device, his only other option
was to pay serious money to have a company do the role of the ...

Is that what you would call a device that takes the signal directly from
the antenna before passing it on the the rest of the circuit?
 My little one (11 years old) recently built a crystal radio but even
with my long wire antenna from my shortwave radio the signal is weak.

I'm pretty clueless when it comes to electronics....
If I have a stereo cable, with the ground, the red wire, and the white
wire, and I'm pretty certain the white wire is the signal and the red
wire is for supplying 5volt power to the receiver, is there a simple

I have to design a voltage source ( +/- 18volts, 13A ) using lead acid
batteries. My circuit draw is 700mA and requires plus minus 18 volts to
operate efficiently. I need batteries that can atleast run for 10 to 12
hours before the voltage drops to +/- 17 volts. I am thinking of ...

I'm looking to have a little music playing when I drive my brothers ICE
CREAM TRUCK and was wondering if there are any systems that are good
for this.
Like... do I absolutely have to have an external antenna?  I am not

anybody know what is tha exact meaning of 'aggregate' transfer rate,
which is often used to describe the bandwidth of a communication
system. Ah, i don't think i know the meaning of 'aggregate' :-(

I'm trying to figure out the current through each parallel branch of
a series/parallel circuit.  I can't draw the circuit so I'll
describe it.  We have a 100v battery, the current leaves the neg
terminal of the battery travels along a single path hits R1 5ohms, then

I have a Kenwood PB-39 9.6V NiCd battery for my Kenwood TH-G71.  It has
5 contacts on it.  On the side that is in contact with the radio, there
are 2 contacts labeled + and - so I will call them R+ and R-.  On the
back of the pack there are 3 contacts labeled, -, T and + I will ...

I'm going to try to program a simple keyboard translator using the PIC2455
which has a built in EUSART.  At this point I just want to get the keyboard
codes into the pic and I just want to run this by you guys to make sure I'm
on the right track.

hello, i want to start working with microcontrollers. i'v been
recomanded to use 89s52. i know c programming. i want to know where can
i download an assembely compiler. what information do i nead to program
89s52 and where can i found these information? thank u.

After I use Xilinx ISE do Place & Round and generate bit file, I am
confused with a DRC warning
"WARNING: DesignRules:7-Netcheck: An antenna was found on signal; this
means that a branch of this signal is partially routed or has a routing