# COMMUNITY : FORUMS : BURNING QUESTIONS

## 12 VDC

AC -> 12v DC, 1000mA Output -> Halogen Lamp = Nothing.
DC -> 12v DC, 10 AA Batteries -> Halogen Lamp = Works fine.

Yes, the wall adapter works.
Why does the Halogen Lamp not accept the current?
@ 6v, 5W (0.83 Amps, right? Just under the AC output..)

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Goodhart8 years ago
what are the power requirements of the lamp?
NarNar (author)  Goodhart8 years ago
6 volts & 5 watts.

To save a post, I'll ask you, although the question is not limited to anyone:
In accordance to.. 10101001010020984828920's reply, could I possibly use a capacitor and/or transistor to achieve some sort of push-start?
8 years ago
The old "starter's for the older florescent lamps were more like a neon bulb then a capacitor. I do know they use capacitors to start some motors.

You do realize that 1,000 mA = one amp ?

Amperage is calculated from the voltage and the circuit's resistance.
NarNar (author)  Goodhart8 years ago
Yes, I do realize that. The Halogen Bulbs take 0.83 amps, as calculated from the V and W -- correct me if I am wrong. The fact that the bulbs are getting an extra 170mA just adds to my head scratching as to why they don't work with the AC Tx. I will mess around with them more and post back if I get something. Thanks for your help.
8 years ago
motors need ac phase shift to start (and some to work too) the fluorescent lamp needs higher voltage to start halogen needs higher current to start try to connect a big capacitor (10 K uF) in parallel with the tx and then connect the lamp to it. it may work. or start it from batteries and flip the switch to the tx what are yo doing with 6 V lamp on 12 V ?? you may want to connect batteries in parallel (6 V higher current) to get it working better
NarNar (author)  110100101108 years ago
It is the only Tx I have come across that has an acceptable Amperage. I have another @ 9v/100mA and another one @ 12v/500mA.

The biggest caps I have are 2x 670uF and 2x 480uF. Will connecting a few of these in parallel/series be sufficient enough?
-- Now that I think of it, capacitors store charge.. Volts is charge, right? So how will this solution solve the problem if what it needs is more Amperage?
--- Well I do recall you or Goodhart mentioning how if you increase the V then proportionally it will also increase the Amperage.. but bleh it's still a little WooOOooOooOo to me...

8 years ago
problem is that if you manage to light up your halogen lamp youll most likely burn it right away capacitors store charge. how it appears to you depends on how you connect them if you connect the capacitors in series their voltages sum up if you connect in paralle their voltage together is same as of each. but when you load the circuit the charge from the capacitors helps to provide the needed high current in the first moment thats on very surface level. for more complete answer keep on asking !
NarNar (author)  110100101108 years ago
Thank you very much. Examples with Reasoning behind them helps me understand things much easier. I'll try to connect a capacitor in parallel to one of the Halogen lamps in a few mins, and let you know how it went.
8 years ago
plz get a 6 V power supply before we continue. the 12 V supply is very likely to burn your lamp if we manage to light it somehow (what happens with the batteries is that the load of the lamp rerduces their actual voltage - probably to well below 12 V. this usually does not happen with txformers and more powerfull sources) a computer power supply can give 5 V which is ok for 6 V lamp. if you have one (or can get for free broken one from computer shop and replace the blown capacitors) its great
NarNar (author)  110100101108 years ago
I've aquired 5 {5v} power supplies, all with 1A.
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