Free Energy Charger Circuit

Free Energy Car
Figure 13-4 Solar-powered phone charger schematic: car charger.
Usb Solar Charger Circuit
Figure 13-5 Solar-powered phone charger schematic: USB type.

Project 3M: Build Your Own Solar-Powered Radio

You will need

Ferrite rod antenna 60-160 pF variable capacitor BC183 transistor 10 nF capacitor 0.1 mF capacitor x 2 470 pF capacitor 220 R resistor 1 k resistor 100 k resistor x 2 10 k potentiometer Speaker PV cell

PCB stripboard

Tools

• Soldering iron

A solar radio is another great idea! Never mind "Desert Island Discs," with a solar radio, you can ensure that if you are ever marooned, you are able to listen to your favorite radio stations!

In this circuit we are going to build a simple AM radio that is powered by the sun.

There are some commercially available radios powered by solar energy; however, it is relatively easy to build your own. We are basing this circuit around the MK484 integrated circuit, which takes all the hassle out of building a simple radio. The integrated circuit looks like a transistor with three pins, and reduces the amount of external components needed considerably.

The schematic for the circuit is shown in Figure 13-6.

The radio has two controls. The variable capacitor changes the frequency that you are tuned to, and the potentiometer acts as a volume control for the simple transistor amplifier.

There are a number of commercially available solar radios; one idea for mounting, which you

Solar Charger Circuit Schematic

Figure 13-6 Solar AM radio schematic.

O rt

Figure 13-6 Solar AM radio schematic.

could easily accomplish with the solar radio circuit above, is to mount the circuit in a set of headphones, like the solar radio shown in Figure 13-7.

The radio in Figure 13-8 is the "Freeplay" wind-up radio invented by Trevor Bayliss. It uses

Inventor The Wind Radio

two renewable energy sources—solar power, and for less sunny days "human wind-up power" in order to make sure that even when the sun doesn't shine, you aren't without your tunes!

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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