Electronics Forum / Basics / December 2007

I have  a  600W modified sine wave inverter  and am trying to run a 70w bar
fridge.
It almost starts the fridge but overloads.
I have been told that a 600w pure sinewave inverter would probably do the

Okay, I was curious about the actual speed my controller
is running at, so I ran the following loop on it. If I'm not mistaken,
I've set OSCCON to 8MHz, so at 4 clock/instruction I should see
0.5 uS pulses. My scope on RB4 shows pulses 5uS wide!

Lets say we have a nice windy and sunny day and some discharged
batteries. Lets say 11V. I hook up the pv charge controller, its
putting out whatever V it thinks is getting max power. Lets say its
14V. Now the microcontroller on the wind turbine charge controller

How can a Schottky-barrier diode enhance frequency performance ?
Can someone here kindly provide me with some link or document that
talks in detail about Schottky-barrier diode's relation with frequency
performance.

Looking at datasheets for op amps that can take a large differential
input.
TLC271 says +/-Vdd
TL071 says +/- 30volts

I'm about to build an FM crystal radio, but the schematic calls for a
50 pF variable capacitor, would a 2 section 233/86 pF capacitor work,
if I only use the 86 pF section?
Radio page:

after diagnosing an old microcontroler board with lots of various
old caps i thought maybe an ESR meter to be a good tool for the
tool box ? yes/no or a better tool for the box
so i googled for some ESR meter plans and settled on this one

The television advertisement updates about latest products but at the
same time creates headache when they comes in the mid of some
interesting moment
http://tv-tv-television.blogspot.com

please check out the design @ NASA tech contest and comment on it.
http://www.createthefuturecontest.com/pages/view/entriesdetail.html?entryID=798
--thanks.

Who supplies?
R

Okay, new PIC issue causing premature forcible hair removal. The code below
is supposed to put 1's on the PORTB pins (PIC16F690). It's not happening;
what am I missing?
BANKSEL 0x01

A thread in rec.radio.amateur.homebrew about the Peter Dahl
transformer
company possibly closing down lead me to this unusall transformer
design.

I have just run cables around the house with the idea of sending audio
output to various powered speakers from the PC's sound card.  This
works well with the shorter leads which use standard cables bought
with jack plugs fitted.  The longer cables are made from high quality

Thanks to all for the ESR meter advice.
I had settled on building this *free* ESR meter schemat ...
http://www.qsl.net/iz7ath/web/02_brew/15_lab/06_esr/
however something troubled me about the schematic

I have this unbranded meter that has a setting to test continuity (w/
a beep) and I noticed a diode symbol next to it as well.
Putting the leads across a diode I think is good I get "1" (infinity)
one way and a cryptic "566" the other way, what do these readings