Mini battery operated soldering iron

The main advantage of this mini soldering iron is that it is powered by a 3.7 V battery. It is not tied to the network and can be safely taken with you. Of course, its power is not large, but it is enough to solder the wires or solder some fallen off radio element.
Mini soldering iron with battery power

And so, what do you need to make a mini soldering iron?

  • Single core wire with core diameter 2 mm.
  • A piece of telescopic antenna.
  • Nichrome, wire 0.2 mm. 10 cm long.
  • Reinforced fiberglass cambric.
  • 3.7V battery.
  • Battery compartment for this battery.
  • A piece of round wood.
  • Switch.
  • Thin single-core wire 0.3-06, diameter (can be dissolve the multicore).
Mini soldering iron with battery power

Manufacturing mini soldering iron

Take a thick single-core wire with a diameter of 2 mm section.Remove the insulation with a knife of a knife or some other way.
Mini soldering iron with battery power
Then take a telescopic antenna from any receiver, joystick or radio and disassemble it. We need to find a tube, which will tightly enter our veins from the wire. Once the antenna's knee is selected, the remaining parts can be removed.
Mini soldering iron with battery power
Mini soldering iron with battery power
Using a machine tool or manually file, sharpen a thick core of a wire under the cone - it will be a sting for soldering.
Mini soldering iron with battery power
Cut off with a hacksaw about 1.8 cm.
Mini soldering iron with battery power
Cut off about 4 cm of the tube that was taken from the antenna.
Mini soldering iron with battery power
Take the nichrome wire and measure 10 centimeters, cut off the rest.
Mini soldering iron with battery power
Take a wire with a diameter of 1.2-1.8 mm.It is only needed for winding the coil, in the future we will not need it. Its material does not matter. We wind the nichrome wire, leaving the ends about 1 centimeter apart.
Mini soldering iron with battery power
Then take a thin core of copper wire, fold it in half and twist with nippers.
Mini soldering iron with battery power
Mini soldering iron with battery power
Let's roll the nichrome wire into the resulting ear and twist the ends around the copper wire. And for now, let's postpone.
Mini soldering iron with battery power
Take the tube from the antenna and the cambric from reinforced fiberglass we will sell inside the tube. If the cambric you have a larger diameter - you can make a longitudinal incision and fit the diameter of the tube.
Mini soldering iron with battery power
Take everything together and assemble.
Mini soldering iron with battery power
We pass the nichrome coil with wire into a cambricum, so that only a 1 cm long wire sticks out from the outside. From this centimeter we make a coil around thermal insulation.It will be a thermoelement.
Mini soldering iron with battery power
Mini soldering iron with battery power
Take our stinger and insert it into the tube from the antenna. Mini soldering iron with battery power
On the other hand, insert our thermocouple until it stops. Mini soldering iron with battery power Take a round piece of wood and saw off about 2-3 cm.
Mini soldering iron with battery power
Mini soldering iron with battery power
In the center, drill a hole for the soldering element. Mini soldering iron with battery power From this hole, with the same drill, we mill a groove, see photo.
Mini soldering iron with battery power
Insert the soldering iron tip with the thermocouple assembly. And we will turn the tail into the groove.
Mini soldering iron with battery power
Drilling more holes,but smaller diameter and a little farther from the center.
Mini soldering iron with battery power
Take a thin copper wire and loop on the tube and bend it. This will be the second contact.
Mini soldering iron with battery power
We put everything in a round wood.
Mini soldering iron with battery power
Fix the bent conductor with hot glue. And glue the battery compartment. Polarity is irrelevant.
Mini soldering iron with battery power
On the other hand, we attach a switch to the battery compartment. Also fix the conductors with glue. We connect everything in series: thermoelement, switch, battery.

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