with MS paint, Netscape Composer (comes
with 4.6) or FrontPage Express (coms with MSIE 4)
(to convert from *.BMP to *.GIF
)
you can make a diagram like the
above in just 1/2 hour, coil is made up of "C" (then copy & paste,
move, paste, move, p... )
From Eric
-----Original Message-----
From: Wagner Lipnharski <wagnerl@EARTHLINK.NET>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, November 09, 1999 11:28 AM
Subject: Re: [OT] Ringing Chokes and batteries
>Hello dear Alice, looking for a small step up
conversion circuit?From: Wagner Lipnharski <wagnerl@EARTHLINK.NET>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Tuesday, November 09, 1999 11:28 AM
Subject: Re: [OT] Ringing Chokes and batteries
>What are you trying to power up?
>What is the input and output Voltage x Current?
>:)
>
>Wagner.
>
>
>Example of a simple circuit:
> Diode
> .------>|------------o---o High V
> | |
> 3| <- point A |
> 3| --- HV C
> 3| ---
> 3| |
>+1.5V----o------------------3| <- point B |
> | 3| GND
> R 3|
> | Nc----------3| <- point C
> o------P 3|
> | Ne--. 3|
> | | 3| <- point D
> | GND |
> | |
> '---------||--------'
> C
>
>This circuit use a "one coil" transformer with two taps.
>
>At power on, all points have the same +1.5V.
>
> 1) Resistor R makes the NPN transistor conducts
>
> 2) Current Flows from ground to point C, via coil to B to +1.5Vdc.
>
> 3) Point C is grounded
>
> 4) Point D will develop a voltage below ground
>
> 5) Point A will develop a voltage higher than +1.5V.
>
> 6) Voltages goes increasing
>
> 7) Voltage at point D is enough negative to cut off transistor
> via capacitor C.
>
>8) Transistor opens, Point C goes floating.
>
>9) High + Voltage at Point A is rectified and stored at HV C.
>
>10) Capacitor C (blocking the transistor) starts to discharge via R
> and coil taps D-B.
>
>11) Upon C discharged, R is enough to turn on transistor again.
>
>Cycle repeats in a frequency determined by R, C, and the transformer
>itself.
>
>This kind of configuration was widely used, using a cheap small
>transistor audio output transformer (transistor radio), connecting the
>secondary in series with the primary. Some different configuration was
>used at those toys to catch your friends with 500Vac from a single
>cell... remember? Nasty salty taste of high V... :)
>
>!!! Watch out kids, don't do it at home, you can kill the cat !!!
>