- Joined
- Jan 21, 2010
- Messages
- 25,510
That last video is woo woo. Just take a look at other titles (like having the light stay on even without the battery).
find an old computer power supply and take out the transformer which produces at least 2 independent 12V rails. Wire the two windings so you get a centre taped winding and use that as your primary. The old primary is your secondary. These transformers are designed for relatively high power at high frequency and would be a good place to start.
if this gets close, you can remove any other windings and modify or re-wind the low voltage winding.
HOWEVER you cannot break the rule that you need to put more energy in than you get out.
if you want to light a 240v 50W bulb (requires about 200mA at 240V, then you will require somewhat more than 50W from your 12V source. That means 5A or more. From a 9V battery -- not going to happen.
find an old computer power supply and take out the transformer which produces at least 2 independent 12V rails. Wire the two windings so you get a centre taped winding and use that as your primary. The old primary is your secondary. These transformers are designed for relatively high power at high frequency and would be a good place to start.
if this gets close, you can remove any other windings and modify or re-wind the low voltage winding.
HOWEVER you cannot break the rule that you need to put more energy in than you get out.
if you want to light a 240v 50W bulb (requires about 200mA at 240V, then you will require somewhat more than 50W from your 12V source. That means 5A or more. From a 9V battery -- not going to happen.