A converter that will make an LED light from one battery

Every electronics guy knows that Light-emitting diode will not glow at a voltage below 2 V. Using this simple circuit you can make Light-emitting diode lights up from one 1.5 volt battery.

Materials:

  • Ferrite ring.
  • Winding wire 0.3 mm
  • Transistor KT315.
  • Resistor 100 Ohm.

If you use PNP transport instead of NPN, then you need to change the polarity of the power supply and LED. I took a ferrite ring from the ballast of an energy-saving lamp. The resistor can be used from 50-100 Ohms.

Scheme

Manufacturing

1. First, we wind the wire onto the ferrite ring. We wind 10 turns with two wires in parallel.

2. Then we find the middle winding point.

3. Solder the negative leg to the emitter of the transistor LED.

4. Solder the positive leg to the collector of the transistor LED.

5. We also solder one inductor leg to the transistor collector.

6. Solder the resistor to the base of the transistor.

7. Solder the second terminal of the inductor onto the resistor.

8. Solder plus power to the emitter of the transistor.

9. Solder the minus power supply to the middle point of the throttle.

Checking the work:

Advantages of the scheme:

With this scheme you can squeeze all the juice out of dead batteries. Using this scheme, you can make a flashlight that will be powered by one 1.5 volt battery.

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5+two=
Comments (5)
  1. Olkeg Goryunov
    #1 Olkeg Goryunov Guests 3 April 2020 19:46
    12
    For the diagram drawn, the polarity of the battery and LED need to be changed. Or use a PNP transistor.
  2. Novel
    #2 Novel Guests 6 April 2020 19:36
    6
    Won't the diode burn out? The current through it is not limited by anything!
  3. Arthur
    #3 Arthur Guests August 20, 2020 09:47
    4
    I did this. If you use a germanium transistor (MP39-MP42 or MP-37-MP38), then it works from 0.5V.
    I only had 25 turns, a ring from a dead housekeeper lamp.
    It is advisable to install a capacitor from 10 to 1000 μF in parallel with the LED, observing the polarity - the brightness will be much higher.
  4. Tolik
    #4 Tolik Guests 20 October 2020 12:59
    2
    Sorry for the noob question. Since I’m a complete newbie, does it make sense to put another resistor between the throttle leg and the transistor collector?
  5. Guest Sergey
    #5 Guest Sergey Guests 1 December 2021 22:30
    2
    The circuit works, instead of a ring I took a ferrite tube from the heterodyne circuit of the Sokol receiver, 12 turns 0.25plsho.