Trigger circuit for large xenon flash tubes----make money online

hey everyone I built a better trigger

circuit for my flash tube stuff that I'm

going to use for the Ruby laser project

so I thought I'd show you how I did it

and what sort of flash tubes I can

trigger with it so here's the setup I've

got this electrophoresis power supply

charging up the capacitor bank there to

about 1,200 volts and the capacitor bank

is connected directly across the flash

tube kind of like this so the capacitors

that I'm just representing with one

symbol here are wired directly up to the

flash tube and we can do this because

1200 volts is not enough to break down

that xenon gas in the flash tube and

actually create a flash or a discharge

what we need is a trigger pulse and the

trigger is actually just a piece of wire

that's wrapped around to the outside of

the flash tube and if we put a really

fast rising edge high voltage pulse on

that trigger line it will ionize the

glut of the gas through the glass of the

flash tube and then lower the resistance

and suddenly all of that power that's in

the capacitor bank can discharge through

the flash tube the trick is that if your

flash tube is very long you need a very

high triggering voltage to ionize all of

that gas in there so this particular

flash tube over here is actually

relatively easy to trigger very small

flash tubes are even easier to trigger

just because there's less gas and less

distance between the electrodes so for

something like this little toy flash

tube project the trigger transformer can

be quite small this might take an input

of 50 to a few hundred volts and output

you know single-digit kilovolts for a

professional flash unit there's a

slightly larger flash transformer

trigger transformer this one probably

takes a few hundred volts in and

generates maybe 10 or 20 kV however the

circuit that I built is quite a bit more

powerful I'm using a automotive ignition

coil and dumping a 300 volt cap into it

and this generates about three

centimeter long sparks which should

correspond to about 90 kV

I need this high voltage in order to

trigger these large flash tubes that I

have for the Ruby laser project here's

the basic circuit diagram we've got a

300 volt rail coming in from the smaller

electrophoresis power supply and this

resistor is about 16 K ohm just to let

the supply know that there's something

there these electrophoresis power

supplies are sometimes reluctant to

start unless there's a load connected

then I added this diode just to try to

keep high voltage pulses from backing up

into the supply and this resistor limits

the charge rate of the main capacitor

I think this capacitor is about three

hundred microfarads at 350 volts the

trigger circuit couldn't be simpler it's

really just a switch and I put another

smaller cap across the switch just to

try to keep down destructive voltages

should those be generated across the

switch and closing the switch dumps that

capacitor right into the induction coil

or the ignition coil and we end up with

a high voltage pulse out in this case

the trigger line is that mesh of wire

wrapped around all the flash tube in

there and I've connected to it with this

high voltage 30 kV silicon wire that

goes into the ignition coil inside here

so all you have to do to run it is just

press the button and we get a nice flash

out of it and I've also got my

high-speed pin photodiode over there

connected to the oscilloscope so we can

see what the pulse of light looked like

in terms of duration

so to figure out the amount of energy

per flash we've got a one-half CV

squared C is 180 micro farad's those are

those two strings of capacitors that I

have wired up and the voltage is

actually 1200 minus 150 which is the

residual that's left in the capacitor

bank after it fires and so we end up

with about a hundred joules from the

scope we can see that about 66 percent

of this energy is a shot off in about

two hundred seventy-five microseconds

and then knowing that we can figure out

what the effective resistance of the

flash tube is and we get about an ohm

and a half which is that's reasonable

for flash tubes the effective resistance

actually depends on the amount of

current going through the flash tube so

there's this K constant that describes

what the effective resistance is

depending on on the current flow in this

case the current flow is probably not

all that much since it's a relatively

low power pulse in order to discharge

the capacitor bank what I do is shut off

the supply and then I have this 3300 ohm

thick film capacitor which I can touch

to the terminal here and draw a little

arc off and this will actually discharge

the bank slowly enough where it's easy

to deal with okay so next time I'll have

the real flash tube but I'm going to be

using with the Ruby laser hooked up it's

quite a bit bigger than this one even

and hopefully it will be triggering

reliably with that new larger trigger

circuit okay see you next time byeearn money online without investment for students, earn money by clicking ads, earn money online without investment, online earn money website, online jobs to earn money, best online income site, top 10 online money earning sites, easy income online, easy online earning, earn money online from home, make money online legit, earn money online free fast and easy, online earning websites list, genuine online money earning sites, online work to earn money, online surveys to earn money, earn money through internet, best online income, earn money online data entry, easy ways to make money online, best online earning websites, top websites to earn money, online typing jobs for students to earn money, earn skrill money online, earn skrill money, best way to earn money from home, make instant money online absolutely free, trusted online money making sites, online income site, best online earning, money online, earn money from home, earn dollars online, earn money online, earn money online 2019, earn money online by typing pages, earn money online daily, online work at home and earn money, online earning,