# Pathway Lighting with LEDs

Simple pathway lighting that would provide illumination for the path at night. Extension for the Solar garden Light. The torroid is bifilar wound. The Torroid is 10mm and Cat 5 cable is wound around the same.

Solar panels of 3.5 maybe difficult to procure using 2 2V panels in series could be used. If you do use 4V panel then suggest you add another diode in series with 1N4001 to drop voltage to contain voltage to the battery.

The characteristic voltage for a white LED is 3.2V but the addition of the torroid provides the boost to drive the white LED. If you cannot procure the battery as suggested you can use 600 mAH battery then do not go above 3/4 LED’s.

## Related Tutorials

• Clair

for better electrical efficiency (less voltage drop)
replace the 1n4001 with a 1A shockey diode, another one could also could be put in series with the LEDs and a small 10uf capacitor added to increase the efficiently, but it may need a small resistor to limit current.

• Afoofbi

I want to power 10 red LED from 555 output pin and have try using 1815 to amplify it but it still dont work.kindly help me out

• mfahern

Thanks a lot by your answer Mr. Kushero, I have already built the circuit and works, but with a very low light (with 12 parallel LEDs), my new question (and sorry but I’m a newbie hobbyist), can I simply change the panel by a 6V/150mA and the battery by a 3.6V one?, or must I change the resistor values?, in this case how must I calculate the new values ? (in a practical way), because ohm’s law seems like Chinese to me 🙂

• Sebastian Kushero

Oh yes you can use a panel with higher voltage and a battery to match it .

At his circuit is kind of a joule thief. Meaning that although the characteristic voltage for a white LED is 3V to 3.2 V we are lighting it with a 2.4V battery.

If you do intend to use a 6 V panel and a 3.7(4.2V) battery its perfectly okay but use the other circuit(http://electroschematics.com/6855/automatic-solar-garden-lights-with-leds/) for then you do not need the extra transistor and coil.

Its simpler and uses minimum components

• Sebastian Kushero

THIS CIRCUIT IS MAINLY A SWITCHING CIRCUIT AND THE INPUT VOLTAGE WOULD HAVE TO BE HIGHER THAN THE BATTERY VOLTAGE. BY 2v AT LEAST TO COMPENSATE FOR THE LOSS IN THE DIODE. YOU COULD USE ANY PANEL BUT REMEMBER TO PUT A ZENER TO REGULATE THE VOLTAGE THE BATTERY RECEIVES TO AVOID DAMAGING THE BATTERY. IT MAY BE DIM DUE TO THE TOROIDAL WHICH IS BIFLAR .
EXPERIMENT WITH A FEW MORE/LESS TURNS TILL YOU GET THE DESIRED RESULTS . The coil performance is dependent on many factors like the material the gauge of wire you use the turns

• mfahern

Hi Sebastian, it is possible to use BC548 and BC558 instead of 2N3904 2N3906?, if yes it is needed to change values of other components? and a final question how many LEDs could be lighten with your circuit?, thanks in advance for your answers.
Francisco (Mexico)

• Sebastian Kushero

The no of LED would be limited by the battery and time of illumination you need

• Sebastian Kushero

BC548 and BC 558 in lieu of BC3904 and BC3906 would not be helpful

In place of BC 3904/3906 use a equivalent switching transistor That part can probably be accurately described as a “jellybean” – it’s an NPN switching transistor, Ft 300 MHz, good up to an absolute limit of 40 volts and 200 mA.
They’re quite common and easy to come by, I believe. If you can’t find one, then unless there’s something exotic about your application you can probably substitute a PN2222A. 2N4401 might also work (Ft is a bit lower), and I have no doubt that there are a zillion other
substitutes which would work OK in many circuit applications.

• Johnny

Well post

sir

I want a circuit where i will be connecting 20 white bright leds of 3.6v and 350ma rating.kindly let me the how to make a circuit and also using the same led ratings let me know the solar panel and battery.

thanking you

• Sebastian Kushero

We are in energy efficiency devices what you want is a LED driver for the 1W(3.6v/350mA) Lights.

Secondly Internet is free when it published and anything you ask y9ou should be ready to pay a price as a sometungs may be commercial except what published in the Public Domain

sir