Electronics Forum / Basics / August 2008

Does anybody know why this would oscillate?
Schematic 5.1V LDO 2Ma - 15Ma
http://i36.tinypic.com/fk78ub.png
According to the bode plot this loop should be stable (85 deg PM, 74

Thank you everyone for your input to my earlier thread for my need of
a one chip solution that directed my application to using a PIC.
As a new PIC learner can you give me a PIC choice & part # (kit) that
has the flexibility I need for my application? Also a good webpage for

I downloaded some stuff on how to use
USB from:
http://pe.ece.olin.edu/ece/projects.html
I want to make a PIC act as an HID

I am learning morse code. There are software available which convert
any text into morse and give the output to the headphone jack. I was
wondering if this sound output at the headphone/speaker jack can be
used to power a LED or incandescent bulb? Would be thankful if anyone

I am working on a hobby project and would like to find a "single chip"
solution or "circuit" for a sample & hold frequency to voltage
converter with a no drift output.  
I have a generated audio range of 50 Hz to 300 Hz

1.  The Super Irrigator
a.  The Super Pivot:  tractor wheels powered by an electic motor slide
radially and rotate the pivot for spiral furrows.   Easiest low tech
fully automated field.

If you are saintly like me then the public record is your friend.
On the other hand, if you are a delusional liar, then the public
record is your enemy.
Bret Cahill

I thought this would be easy, but I'm struggling with the details.
I have some lights (12VDC 200W) I want to turn on when the water level
in a fountain reaches a certain point (i.e., the fountain is on).
If I use a level switch and trigger a relay, I have the problem of

oh yeah!
http://blog.makezine.com/archive/2008/08/bread_circuit_board_blink.html

SndScopePro 1.5
Dual Trace Sound Card Scope
Professional Dual Trace Oscilloscope
AC DC Triggered Input

If you get a lot of responses under different handles, all with
nothing to say, is it any better than having zero readership of people
with somethig to say?
Bret Cahill

I've found this circuit:
gnd------voltage source-----current source------resistor----gnd
all sources are ideal
I shoud calculate the voltage across resistor....how can i do?

I am looking to purchase my first oscilloscope use from eBay.  I have seen
many recommendations for the Tektronix 465 series of analog scopes.  I have
also seen several 100 Mhz Tektronix digital storage oscilloscopes such as
the 2232 and 2236 for prices in my range.

OK  I can solder, and 50 years ago took an RCA Electronics course so I could
fix b&w TV's.  Since then, not too much electronical has happened around me!
I now fly some lightweight, foam Radio Controlled airplanes  Every now and
then, due to "operator error"... I put one down in a ...

I am looking at digikey web site the IRFZ44 TO-220AB, there are many
chips available.
I am a bit confuse concerning the resistance Vs  Watt coloumn.
I Will take two randomly