This amplifier uses only one Darlington transistor as an amplifier and can be used as a reinforcement step for radios and other equipment that use a headset. It also serves as a multimedia amplifier. The circuit can be powered with voltages from 6 to 12 V and other power Darlingtons of the TIP series can be used. The transformer can be output for transistor radios or even a small 6V x 250 to 500mA transformer. The circuit is from the book Science Fair Projects by Newton C. Braga, published in the United States.
