Sine to square wave converter

Alan B

On Thu, 17 Aug 2006 20:56:18 -0700, in message
<pgeae2d3dp6jffamugbcpo7f5oi4i9g244@4ax.com>, John Larkin
<jjSNIPlarkin@highTHISlandtechnology.com> scribed:

Alan B

On Thu, 17 Aug 2006 20:54:27 -0700, in message
<jdeae2d57588o1hihd3hvf97laujusdk61@4ax.com>, John Larkin
<jjSNIPlarkin@highTHISlandtechnology.com> scribed:

Mr. J D · electronics forum beginner Joined: 19 Aug 2006 Posts: 5

An Electrolytic Capacitor in series with a Resistor attachced to the
base of a transistor would provide a simple timing circuit, yes? What
is the formula to derive the needed Farads and Ohms?

Bill Bowden

DJ Delorie wrote:

John Larkin · electronics forum Guru Joined: 29 Apr 2005 Posts: 4320

On Thu, 17 Aug 2006 21:04:29 -0700, Alan B
<nannerbac@nothotmailbutyahoo.com> wrote:

Robert Baer · electronics forum Guru Joined: 25 Mar 2005 Posts: 1159

Mr. J D wrote:

Robert Baer · electronics forum Guru Joined: 25 Mar 2005 Posts: 1159

Mr. J D wrote:

jasen · Posted: Fri Aug 18, 2006 9:09 am Post subject: Re: 555 timer

On 2006-08-17, default <default@defaulter.net> wrote:

darkreality · electronics forum beginner Joined: 18 Aug 2006 Posts: 1

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Remember, play FAIRLY and HONESTLY and this will really work

John Fields · electronics forum Guru Joined: 24 Mar 2005 Posts: 3260

On Thu, 17 Aug 2006 18:58:42 -0500, "Abstract Dissonance"
<Abstract.Dissonance@hotmail.com> wrote:

Catch-22 · electronics forum beginner Joined: 17 Aug 2006 Posts: 2

Abstract Dissonance wrote:

default

On Fri, 18 Aug 2006 10:33:37 +1000, "Phil Allison"
<philallison@tpg.com.au> wrote:

Fleetie · electronics forum beginner Joined: 15 Jul 2005 Posts: 3

Look. For once, Radium actually has a point.

It is possible for DC current to flow through air without
producing a spark. I have done it myself.

Take a variable (~30kV) DC high-voltage source. The one I used was valve-
powered, by the way! Take two needles and clamp them so that each
point points to the other needle's point, i.e. they're pointing at
each other. Set the points 1cm apart. Obviously, the needles will
not be electrically connected. Each needle is connected to one
output of the high voltage generator. Start the generator at a low
voltage. Crank it up, and before it does spark (experiment to find
the voltage at which it does, if you like (if you damage your generator
if/when it sparks, that's your problem, not mine)), there will be an
"ion wind" between the needles. Sometimes you can even hear it, or
see bits of dust in the air being blown around. Current is most definitely
flowing, yet there is no spark. There is ionisation, but no spark as such.
In the dark, you will likely see a blue glow at the needles' points. But it
is still not a spark, in that it does connect the needle points.
Turn the voltage down a little, and stick a candle flame between the
electrodes.

Have fun. Don't kill yourselves.

Martin

Disclaimer: This in no way endorses Radium's other stoopid questions.
--
M.A.Poyser
Manchester, U.K. http://www.livejournal.com/userinfo.bml?user=fleetie

kfel · electronics forum beginner Joined: 15 Aug 2006 Posts: 6

T=RC, where R=Resistance in Ohms and C=capacitance in farads and T in
secs. Note that this is the time it would take for the capacitor to
reach 63.2% of the supplied voltage.

Mr. J D wrote:

kfel · electronics forum beginner Joined: 15 Aug 2006 Posts: 6

Chris, I did try out the circuit but went about the testing in a phased
manner.
Step 1:
I rigged up the 555 in astable mode. Provided it with supply from a 9V
battery. Checked the output pin for oscillation and found it to be ok.
Step 2:
Then I rigged up a simple DC supply circuit using a 5.2V zener in
parallel with a 470uF/16V capacitor. (This circuit is explained in the
application note 954A of microchip corporation). Using this as the
primary source of the power to the 555 i checked the output pin for
oscillations and found it to be ok.
Step 3:
Rigged up a circuit containing of a 40W GLS lamp in series with triac
BT06600 from ST Micro. Connected one end of the lamp to the MT2
terminal. Other end of the lamp was connected to Phase (240Volts AC
RMS). MT1 terminal was connected to Neutral. Connected a wire from gate
terminal but did not connect it to the output of the 555 as yet.
Step 4:
Switched on the power supply and checked the output at pin 3 of 555 and
found it to be ok. As the gate terminal was not connected the lamp did
not glow. Now when i connected the gate terminal to the output of the
timer the 555 went kaboom. So did the triac. Unable to understand what
went wrong. Any help would be appreciated.

Google