Model Boat Mayhem

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: 6v batt into 3v lamps HELP  (Read 3390 times)

Stavros

  • Guest
6v batt into 3v lamps HELP
« on: February 22, 2008, 10:12:31 pm »

HELP me forgotten how to do it,someone out there please put me out of my miserey I have forgotten how to calculate a voltage drop by way of resistors

Stavros
Logged

bigford

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #1 on: February 22, 2008, 10:20:30 pm »

Logged

boatmadman

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 2,703
  • Location: South Cumbria
Re: 6v batt into 3v lamps HELP
« Reply #2 on: February 22, 2008, 10:21:26 pm »

If i remember correctly, if you connect two 3v lamps in series with a 6v battery they will work ok as each lamp sees a voltage drop of 3v.

If coonected in parallel to the battery, each bulb will get 6v and pop.

Ian
Logged
if at first you dont succeed.....have a beer.....

Stavros

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #3 on: February 22, 2008, 10:24:50 pm »

Thats what I was initially thinking BUT was not a 100% sure thats why me asked!!!!!!!!!!!!!!!!!!!!!Blown too many things up in the past

Stavros
Logged

Colin Bishop

  • Full Mayhemer
  • *****
  • Online Online
  • Posts: 12,171
  • Location: SW Surrey, UK
Re: 6v batt into 3v lamps HELP
« Reply #4 on: February 22, 2008, 10:27:18 pm »

Just don't connect the red wire to the black wire.  {-)
Logged

Stavros

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #5 on: February 22, 2008, 10:34:31 pm »

Oh Colin me definatly NOW have a problem cos both DAMMED wires are guess what     BLACK


STAVROS
Logged

portside II

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,523
  • tugs at rest
  • Location: Howden.East Riding of Yorkshire.England Near the banks of the river Ouse
    • goole model boat club indi site
Re: 6v batt into 3v lamps HELP
« Reply #6 on: February 22, 2008, 10:37:29 pm »

good job it's not mains (240v) cos thats ,
green to green ;)
brown to brown O0
blue to bits :D
daz
Logged
I like to build my boats to play with, not to just look pretty, so they dont !

OMK

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #7 on: February 22, 2008, 11:08:34 pm »

Stav, remember that incandescent lamps are not like LEDs -- lamps are not fussy about polarity. But in order to calculate the required voltage dropper resistor, you need to know the current (amperage) rating. Look on the metal casing of the lamp. It might say something like 30mA or 60ma or 80mA or....
If you can come back with the mA number, I'll show you how to calculate the value for the needed dropper resistor.
Logged

Stavros

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #8 on: February 22, 2008, 11:41:34 pm »

Hi this is the problem I have nothing on the lamps,they are sealed will have to contact the supplier


Stavros
Logged

Shipmate60

  • Global Moderator
  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 5,800
  • You bark - I will bite!!!
  • Location: Fareham
Re: 6v batt into 3v lamps HELP
« Reply #9 on: February 22, 2008, 11:55:11 pm »

Stav,
To run 3volt lamps off a 6 volt battery.
Get 2 lamps
Solder one wire from each lamp together
Treat both lamps as 1 6 volt lamp with the 2 remaining leads.
If 1 blows they will both go out.

Bob
Logged
Officially a GOG.

Stavros

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #10 on: February 23, 2008, 12:37:05 am »

 O0


Stavros
Logged

DickyD

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 9,423
  • www.srcmbc.org.uk
  • Location: Southampton UK
    • SRCMBC
Re: 6v batt into 3v lamps HELP
« Reply #11 on: February 23, 2008, 11:29:32 am »

Just like the old christmas tree lights Stavros, 80 three volt lamps for 240 volts. Then one out all out. O0
Logged
Richard Solent Radio Controlled Model Boat Club http://www.srcmbc.org.uk

wombat

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 625
  • The view from the shallow end of the gene pool
Re: 6v batt into 3v lamps HELP
« Reply #12 on: February 23, 2008, 09:38:57 pm »

Of course if you have four bulbs, connect the bulbs in pairs like Shipmate60, then connect the wires at one end of the pairs together, the wires at the other end together and  the wires in the middle together - then if one bulb fails, only that one will go out - the others will shift in brightness, but still glow - the more bulbs in the mesh the less effect one blowing has.

Wom
Logged
The prat in the hat - www.floatingwombat.me.uk - Have look & say Hi

Stavros

  • Guest
Re: 6v batt into 3v lamps HELP
« Reply #13 on: February 23, 2008, 09:46:06 pm »

Thanks for all your replies with my luck with blown thingies I just had to ask just to be on the safe side.I would have hated to have blown them up cos they look quite pretty on the  old fire boat!!!!!!!!!!!!!!!!


Stavros
Logged
Pages: [1]   Go Up
 

Page created in 0.113 seconds with 22 queries.