Nerd VS Nerd

[cOOter]

Below is Chooper's nerd entry into the nerd off competition..

Capacitor Bank Testing

Below is my nerd constant that I was dribbling about on CB tonight...

8 Capacitor washer launcher

Clearly cOOter's nerd is more neardy than Chooper's nerd  

[Thunderbird]

Big Capacitor Safety

[cOOter]

You're nerd wasted good food. That poor banana  

When he said "emp" my ears picked up though.

I wanna an emp weapon to kill chips with.

How to build a Capacitive Battery Charger (Part 1)

Here's that battery charger I was talking about.

Cheap and easy to make...but...

He's putting 120v AC in one end and supposedly getting a safe 13.8v out the other?

Looks doggy to me.

[Thunderbird]

That's a rubbish circuit, it would be highly dangerous to you and the battery! The bloke is an idiot. If you want to make a small battery charger for car batteries, Ill post you a circuit diagram shortly once I draw it up.

[Thunderbird]

In the meantime gather together the following bits, if you cant find something let me know I probably have a few of whatever it is

1 12 volt plug pack rated at 1 amp or more doesn't matter if its ac or dc, we are going to gut it anyway

or even a 12 to 20 volt smelly transformer out of something, about the size of your fist.

1 bridge rectifier, any old one out of a tellie will do

1 470 uF or bigger capacitor up to say 2200 uF and rated at 35 volts or thereabouts

1 10 uF or 22 uF capacitor rated at 35 volts, more old tellie bits.

1 7812 IC it has 3 legs looks like a power transistor, black resin body and has a metal top with a bolt hole in it,
even better if you can find an LM317 IC looks the same, might have LM7812 or LM317, but first 2 letters may be almost anything, depends on who made the bugger.

4 smelly old diodes, like 1N4148 or 1n4004 1N4148's look like those tiny glass and red diodes that tellies have in them, 1N4004s are usually black with a white band on them

1 heatsink to suit the IC, one out of an old tellie is good, about 4 inches square or so, or a hunk of old aluminium about the same size

1 fuse holder and 1 1amp fuse

1 switch for the power, so it should be a power type switch, it will have 250 VAC written on it, doesn't have to be one that will do 10 AMPS though

old power cord with 3 wires, we want to earth this bugger.

1 led to show the power is on and things are happening

1 resistor to suit the led, anything around 470 ohms (yellow violet brown bands) to 1 000 ohms (black brown orange bands) will do, we'll sort it out 'cause it depends on the colour of the led

some sort of box to bung it in, even an ice cream container or old DVD disk stack box, a weatherproof box would be nice

some scrap wires and croc clips


More later...

[Thunderbird]

Once we get that happening, we can advance to nasty big boys high voltage toys 

[cOOter]

Advance to nasty big toys? I wanna EPM gun that will knock spying drones out of the sky. They hard to make?

I was reading more on that other charger.

Seems high voltage/ low amp circuits with a 60watt bulb inline, are useful at getting dead 12v batteries to wake up.

"Now if you force 10X the nominal voltage, and give the battery over 120 Volts DC, despite the sulfation, the battery WILL conduct electricity, and start taking a charge." http://www.diyaudio.com/forums/power-sup...ifier.html

Seems like a lot of nerds agreeing on that page. If that setup works as a desulfator, it would be easy to make.