Electronics Forum / Design / March 2005

FYI, I've put 2 of my PIC projects (chronograph and rechargeable
lantern) on a webpage at:
http://www.geocities.com/pest3125
Hopefully, I can add more projects later. Note that there is only

John Larkin wrote...
See John's fast rise/fall-time 50V pulse with a 2n7000, on a.b.s.e.
That's pretty good, 1.9ns rise and 2.5ns fall, how'd you do that?
Hmm, how short can you make it (without using a PFN)?

Hi - I'm trying to simulate a circuit with spice (which I'm very new to). I
first set a DC sweep on the input (V3):
https://netfiles.uiuc.edu/mnoone/www/Electronics/iviewcapture_date_30_03_
2005_time_11_38_36.jpg

I have a small question. I want to make a simple tone
(10MHz)transmitter cct from a 1Vp-p 10MHz input signal. I can drive a
transistor(NPN) from this signal. But my question is, to get maximum RF
output, should I get the maximum voltage swing @ the collector? or

I use Protel 2.8 and it would like to print the drawings PCB in negative.
How to do that?
TIA
Fernando Carvalho

I'll be selling my house soon and will have a small billboard-shaped
"For Sale" sign (about 4 feet wide) by the side of the road. I want to
'attract the eye' of passers by, and thought of the idea of putting
some flags on the top of the sign and having them rapidly flap back and

Pardon my posting but I'm trying to get in touch with Kevin Brace. He use to
but not recently posted to these news groups. In his signature he asked that
if you wanted to get in touch with him, to not EMailo him but respond to the
news groups.

Ok, I forgot that they are starting to charge from april1
and they dont take paypal:(
Which server are you going over to?
Nope I wont use google groups

http://www.jcil.blogspot.com << The Greatest News Ever!

I'm posting this to a few electronics newsgroups poking around for a
possible answer...
For years the pinball companies used a small .047 uf capacitor across
some switch terminals for switches that could be closed and reopened

I'm still using the Pspice student version at home that I
got for free from MicroSym back in about 1995 or so...
 I've noticed that it will no longer pick up the symbols and
will not run.  This started about a year or two ago......

i need an application note describing a schematic for a linear position
sensor, in "time of flight" mode. The range of sensing is from 1 mt  to
1 cm, and the resolution less than 1 cm
thanks

characteristic impedance of a line is square root of L/C. It does not
depend on the length. But the losses occuring in resistance, no matter
how small, is dependent on the length. Any literature to read on how
the length affects the charactristic impedance.

I am design a PIC programmer and i am using a strp up converter to
convert from 5V to the required PIC programming voltage of around
13.6V.
Does someone know the ammount of current the PIC takes during

  I want use the (2s1815)or( 2n2222) as a switch for a video signal
when I bias it with (~4.5v) it connect the signal I know that the input
& output must connect to an cap withabout 33uf & aresistor of 75 ohm
but when I try to do this the picture on the monitor become bad but