Power Bank. Simple Design 23


POWER-BANK2

Here is a Power Bank for charging your Mobile phone while traveling or in the event of power failure. This power bank can deliver 4.5 Volts with reasonable current to charge the Mobile phone quickly. It can charge the Mobile phone 3-4 times . The Power bank uses a 4.5 V Rechargeable battery that can be charged using the Mobile phone charger or from the USB port.
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Remote Tester.Simple Design 22


Remote Tester

A simple circuit to test the TV remote whether it is working or not. TV remote uses Infrared LED to emit pulsed IR rays which are invisible to human eye. So it is difficult to confirm the working of IR Led of remote. This Remote Tester blinks an LED when it receives IR rays from the TV remote.

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Transistor Amplifier. Simple Design 21


Transistor Amplifier

Sometimes we need higher sound output from Audio based circuits using either Buzzer or Speaker. This simple Transistor based Audio amplifier will give loud sound from the Speaker or Buzzer.
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