DIY resistor from broken soldering iron

Nichrome (NiCr, nickel-chrome, chrome-nickel, etc.) generally refers to any alloy of nickel, chromium, and often iron and/or other elements or substances. Nichrome alloys are typically used in resistance wire. They are also used in some dental restorations (fillings) and in other applications.

Tools:

• soldering Iron
• Digital Multimeter

Materials:

• nichrome wire from broken soldering iron
• 2 x i inch stainless paper clips (cut it)
• Plaster of Paris
• small tube for mold

First is to measure the ohm value you want then cut the nichrome wire and solder it to the ends of the two stainless so it will be like:

Insert it to the tube centering it with a hard paper with a hole to let through the stainless wire. it will look like this:

The last step is to pour your Plaster of Paris into the mold covering the wires completely and leave it to dry.

Quick and easy Direct Drive Lead Acid Battery Desulfator - Battery Saver

Warning: This device can cause shock or fire hazard. Monitor usage always. The author cannot accept responsibility for any loss or damage arising from the use of this device.

Lead Acid Car and motorbike batteries tend to build sulfate crystals on the lead plates that results into lowering its capacity. This happens when you don't use your car/bike for months sitting in the garage. This is common for all Lead Acid batteries including your UPS backup batteries and there's a way to recover them if there's no shorted cells yet.

This device is consisted of a capacitor bank, diodes and a 12 volt relay and that's it! The relay will act as a very fast on/off switch that will push the charge from the capacitor bank into the battery in a pulsing manner. The pulse is estimated between 90Hz and 150Hz - not much but I managed to save two of my motorbike batteries that won't hold charge  for a day. The power source is my trusted 19V 90W 3A laptop charger.

Parts:

6  x 100v 1000uF  Electrolytic
1  x 12v 10A relay
5  x 1N4008 Diodes
2 x 25V 100uF Electrolytic


Follow the diagram exactly as it is. The desulfator also acts as the main charger so a separate charger is not necessary. Use it once a month to pulse-charge your battery for maximum life-span.

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