Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 64 users online :: 5 registered, 0 hidden and 59 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Launching circuit - cool and simple?

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Unread postAuthor: Davidvaini » Sat May 28, 2011 4:48 pm

Image

I think I understand it now. IF the switch in my picture above, was flipped to the right, i could press the button to fire, or if I had a switch hooked up to that plugin, i could use that switch to fire.. and if I didn't have a switch hooked up to that, I wouldnt need a jumper either, I could just use the button to fire... cause its and "or" and not a "and"..

mind you this is without the diode, i was just seeing If I understand the nature of using a parallel circuit in conjunction with the on/off/on switch.
  • 0

User avatar
Davidvaini
Major General
Major General
 
Posts: 1315
Joined: Tue May 29, 2007 8:58 pm
Reputation: 0

Unread postAuthor: al-xg » Sat May 28, 2011 7:08 pm

Does the charging mode have to be separate from the safe mode ?
The charger should just have to be in parallel with the battery, an could technically even left plugged in and charging when firing etc... ?

I didn't suggest it initially as there was only one "plugin", but as now there are two...
  • 0

User avatar
al-xg
Colonel
Colonel
 
Posts: 643
Joined: Fri Jan 19, 2007 12:29 pm
Reputation: 0

Unread postAuthor: Technician1002 » Sat May 28, 2011 7:13 pm

An armed LED can be connected with a resistor in parallel with the switch and jack. The LED with the resistor won't pass enough current to fire the solenoid, but would clearly alert you that the system is armed. A fire button with the LED in it would do the job nicely.

Many rocketry systems do this. The LED won't light if the ignition is not connected
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: Davidvaini » Sat May 28, 2011 7:26 pm

It doesnt matter to me if I have an LED, never mentioned it actually. I know it would be a nice indication that it is armed, but the safety thing is just so I dont pump the trigger while caring it, Ill know its armed when the toggle shield is fliped up. It is meant for a shoulder fired law launcher, so an indication light isnt exactly needed. But that is a good idea if I decided at a later date that an LED is needed.

I am most likely going to go wit Dewey's circuit, but I just wanted to see if my circuit that I just drew would work. That is all.
  • 0

User avatar
Davidvaini
Major General
Major General
 
Posts: 1315
Joined: Tue May 29, 2007 8:58 pm
Reputation: 0

Unread postAuthor: dewey-1 » Sat May 28, 2011 7:57 pm

David I updated version 3 schematic.
Removed the jumper J2 in Normal Mode because it is not needed.

I forgot to remove it when I went with version 3.
  • 0

User avatar
dewey-1
Major General
Major General
 
Posts: 1298
Joined: Wed Mar 28, 2007 10:24 am
Location: NE Wisconsin USA
Reputation: 0

Unread postAuthor: Davidvaini » Sat May 28, 2011 8:07 pm

dewey-1 wrote:David I updated version 3 schematic.
Removed the jumper J2 in Normal Mode because it is not needed.

I forgot to remove it when I went with version 3.


yeah I figured, since if the jumper was in, it would complete the circuit and i would be doing that anyway by pressing the fire button.
  • 0

User avatar
Davidvaini
Major General
Major General
 
Posts: 1315
Joined: Tue May 29, 2007 8:58 pm
Reputation: 0

Unread postAuthor: evilvet » Sat May 28, 2011 9:26 pm

Hi David

A suggestion for a safety interlock that I use on a lot of firing circuits: wire a mono banana socket in series. Then get a banana jack and solder across the contacts.

Result, if the banana jack is removed the circuit is open and cannot be closed by someone wondering "what's this switch do?" Missile switch covers are all very well but people do get curious. The key switch idea is the same as mine but mine is a lot cheaper :) Put the banana plug on your key chain with a big bit of red ribbon tied to it. When you are ready to fire, plug and pray.

Cheers
  • 0

User avatar
evilvet
1st Lieutenant
1st Lieutenant
 
Posts: 266
Joined: Sat May 01, 2010 2:48 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Technician1002 » Sat May 28, 2011 9:29 pm

My main safety against accidental discharge is to ensure the cannon is not filled until just before firing it.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: evilvet » Sat May 28, 2011 9:33 pm

Which falls into line with my range safety officers mantra "if all the people killed with unloaded guns lined up, it would be a big queue"

Every cannon is loaded and charged at all times, every magazine is full and every safety is faulty. Assume that at all times and you may survive to play another day.
  • 0

User avatar
evilvet
1st Lieutenant
1st Lieutenant
 
Posts: 266
Joined: Sat May 01, 2010 2:48 am
Reputation: 0

Unread postAuthor: Davidvaini » Sat May 28, 2011 9:53 pm

So I tested my circuit and I am working on Dewey's circuit in Yenka.. which is a pretty cool and powerful program... and its free.. which is pretty sweet...

As far as the safety is concern, it is more so that when I am positioning myself to aim at a vehicle, I don't accidentally hit the fire button and fire. Other than that, it is for more of a military feel. The device will be loaded at the time of use, both with air and with the projectile. The pressures and projectiles used are going to be safe just in their very nature.

Now if this was some kind of awesome hybrid or something like that, I would assume all worst case scenarios and plan my multiple safety's etc, but honestly for this low powered project used for milsim events anyway, it honestly just needs to make sure I dont have a premature launch.

So the fact that the cover needs to be lifted up, the switch needs to be fliped to the on position, and the fire needs to be pressed in order to fire the thing, is far within my needs or any fields requirements.


As always, I am going to treat it like the gun is loaded with dangerous projectiles, with high pressure, and that the safety is off.. that goes without saying.
  • 0

User avatar
Davidvaini
Major General
Major General
 
Posts: 1315
Joined: Tue May 29, 2007 8:58 pm
Reputation: 0

Previous

Return to General Spud Cannon Related

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MSNbot Media, Yahoo [Bot]

Reputation System ©'