# 12VDC to 400VDC Voltage Booster

Discussion in 'The Projects Forum' started by physicsguy, Feb 9, 2013.

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1. ### physicsguy Thread Starter New Member

Feb 9, 2013
1
0
Hi,

I'm kinda new to designing electronics circuits. I'm currently working on building a coil gun, for my end of semester presentation for my E&M class; but I'm having some trouble. I'm using five 400V 220 μF caps, and I've read that I will need a power source of about 400V to charge them fully. I'm using D batteries as the power source (currently 8, for 12V total). Is there a way to cheaply (under \$20ish) to boost the batteries up to the required voltage? If I need to increase or decrease the input voltage, I can. Any help is GREATLY appreciated. Thanks for your help.

p.s. I'm actually hoping of bringing this in to a local elementary school, when I give a presentation on magnetism, on February 19th. So if there is a quick way to accomplish my need, it would be awesome!!

2. ### Audioguru Expert

Dec 20, 2007
10,511
1,168
POWER= Volts x Amps. We know the voltage is 400V but what is the current?

You can use a power oscillator driving a transformer to convert 12V to 400V. Then rectify the AC into dC.

Maybe the 400V current must be 1A. Then the 12v battery must supply (400V/12V) x 1A= 33.3A! No way that D cells can supply that high current.

3. ### mattbullet Member

Nov 29, 2008
20
12
This is my first post also.
I have built a coil gun and rail gun in the past. They are really awsome.
I CANT in good concience help with a possible extra hole in some young
School kid.
Besides I think this is a banned topic.

LOCK OUT - TAGOUT that monster.

Matt

4. ### Audioguru Expert

Dec 20, 2007
10,511
1,168
I forgot that there are monster terrorists all around that want us to show them how to make a weapon.
WEIRD!

Apr 5, 2008
18,510
3,570
Hello,

I am closing this thread as it violates AAC policy and/or safety issues.

Quote:
6. Restricted topics.

The following topics are regularly raised however are considered off-topic at all times and will results in Your thread being closed without question:

• Any kind of over-unity devices and systems
• Automotive modifications
• Devices designed to electrocute or shock another person
• LEDs to mains
• Phone jammers
• Rail guns and high-energy projectile devices
• Transformer-less power supplies
This comes from our Tos: