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Do you have some deceased fluorescent lamps? If Yes, then you might still recycle some of its guts to fashion some simple yet usable circuits.
The first gadget is a 12 V to 1.8 V power supply, also known as step down or buck dc-dc converter. These type of SMPS (Switched Mode Power Supply) ar...
Here is what you'll need: -NE 555 (Timmer- oscillator IC) -two 1N4001 or 1N4148 diodes or any similar (for low frequency) -10k trimpot or potencimete...
This is the schematic. 555 drives the Mosfet and it pulses current thru the inductor L and the load. Once Mosfet is off, the magnetic fiel collapses ...
This is my version of the circuit.
Now, connect the NiCd to your dc-dc converter and adjust it to output 1.5 to 1.8 volts. Then power up your MP3 and fine tune it to get the full batter...
This is a circuit that does the oppositte to the Buck converter, it "boosts up" the voltage, hence it is call Boost converter. This circuit is known ...
Now bend your magnet wire in half and wind it around your toroid.Cut the ends and using a Ohmmeter, identify the ends of L1 and L2.Solder the end of L...
Here is how i just soldered it to a Alkaline battery.
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