A detailed guide for building a joule thief inverter circuit
Components Required:
- NPN power transistor (e.G., TIP31c) with a heatsink
- Electrolytic Capacitors: 220uF and 2200uF (both rated above 12V)
- Standard diode (1N4007) and fast healing diode (UF4007 or 1N4148)
- Resistors: 220 Ohm, 470 Ohm, and 3 12 Ohm 20-watt resistors
- Transformer ferrite middle or ferrite ring
- Magnet wire: zero.2 mm and zero.7 mm
Steps:
Prepare the Transformer:
- Heat the ferrite core until the adhesive melts and disassemble it.
- Unwind all of the magnet wire from the center.
- Scratch the enamel coating off the wire ends.
Wind the Transformer:
- Wind the secondary winding with zero.2mm cord: start with soldering the twine to the pin, wind 25 turns, add tape, keep till two hundred turns, then solder the cease.
- Wind the primary winding: solder wire to the pin, upload nine turns, and solder the alternative give up to the alternative pin.
- Wind the feedback winding: similar to the number one winding.
- Put lower back the ferrite core and tape it.
Assemble Components on Perfboard:
- Solder all the additives onto the perfboard in step with the schematic.
Testing:
- Test the circuit with a 12V battery.
- The circuit attracts about 1 Ampere when powering a 12W LED bulb at full brightness.
- Adjust the resistor to lower contemporary draw if vital.
Notes:
The circuit operates at a excessive frequency (round 16-18 kHz), making it appropriate for powering mild bulbs but no longer other digital home equipment.
Increasing the resistor price can decrease modern draw but may also slightly dim the bulb.
The circuit also can energy a 14W fluorescent lamp, although it may not be as brilliant because the LED.
This guide provides a clear review of building and checking out the joule thief inverter circuit for emergency lighting functions.