Automatic solar charged Daftman LED Light

This the Daftman LED / charger light with an automatic solar charging circuit added. The addition is taken off a circuit posted at Talkingelectronics.com. The circuit posted there was for a 'solar garden light'. I took just the solar charging part and added it to the Daftman circuit. This allows the circuit to turn itself off when the solar cell is charging in sunlight and then automatically turns on the LEDs when it gets dark. This now makes the device just like a regular 'solar garden light' only while it is running the LEDs at night , it is also recovering some of the energy into a second battery. This automatic solar charger part should also work on a Joule Thief circuit.

Category:

Science & Technology

Tags:

• Solar energy
• Lighting
• Joule thief.

[BodkinsEnergy]

Lid nice work, can you use the hot,cold cell,as well with the bottom in water.would this get you more potential difference?....your always going to have water around.LOL

[Lidmotor]

Bodkins---- Thanks.  The Peltier module might work if I got the temperature difference enough. On my boat the water and air temperatures are not far enough apart. If I focused the sun with a magnifier on one side and kept the other side at ocean temperature then it might work. I need about 100 degree difference for it to really put out.

[megavox]

Fantastic

[Lidmotor]

Megavox-- Now if I can just get this idea to charge and turn on and off my CFL Halo light. Hummmm.

[rroge5]

you wouldnt have to have 1 battery charging the other one if the joule theif wasnt using excessive power.

[Lidmotor]

rroge5----These circuits run the LED on the back spike coming off the coil and they are very efficient. A good one runs at less than 10 millamps and will run all the way down to .3 volts. All I am doing here is grabbing a bit of that high spike energy into a battery as comes out of the diode. Just like in a Bedini circuit.

[zaryl77]

Sir, can you give me the series number on every component you used? I'm very interested on constucting one.

[acmefixer1]

Your JT has two transistors, the first inverts the output of the second transistor, so you don't need a feedback winding. Unlike the talkingelectronics JT, it is a true two transistor DC-DC converter, not a single transistor JT.

I'm at a can't understand why you go to all the trouble to display the schematic when you simply will not hold the camera still enough to allow the viewers to see the schematic. But thank you for what little I could see.

[acmefixer1]

I'm not sure why you're comparing this to the talkingelectronics Joule thief. That JT uses a single transistor for the JT, the second transistor has no part whatsoever in the JT operation. It is used to invert the output of the solar cell, in other words, when the solar cell is generating, it turns this transistor on, which in turn shorts the base bias current to common negative, turning off the JT. The JT coil has two windings, a primary winding and a feedback winding.

(cont'd next comment)

[tectalabyss]

You've done it again!! great work .Keep em coming.Thanks for sharing. Tec

[rroge5]

i think youll find the joule theif would be alot more efficient if the coil was resonating at its resonance frequency. when i made a joule their i found it was using over 200x the power it would take to light the white Led.i put a 10uf electrolitic capacitor accross base and emitter on the transistor and it seemed to take down the usage of power alot.

[kubikop]

Put one side on the engine with a heat sink in the water on the other side......

[BodkinsEnergy]

right thats a lot of difference.good idea on the magnifier, I use one at the weekend for lighting a fire be carefull it hurts!!!!

LOL