Radiation Sensor. Simple Design 27


RADIATION-SENSOR-2

This circuit tells you how much radiation is coming from electric devices. It picks up the AC hum from the surroundings of electric equipment and electric wiring and blinks the LED to show the radiation level. You can also use this to assess the safe distance from Computer radiation.
Continue reading “Radiation Sensor. Simple Design 27”

Spike Guard. Simple Design 25


SPIKE GUARD 1

This Tiny circuit can protect your LCD TV from Voltage surge at power on. It takes 2 minutes delay before connecting power to the TV. Within that time, mains power will become stable. Heavy inrush current at power on or when power resumes after a power failure can damage the TV permanently. If few minutes delay is provided, the AC will become stable. This is the delay technique used in Stabilizers.
Continue reading “Spike Guard. Simple Design 25”

Telephone Guard. Simple Design 24


TELEPHONE GUARD 2
This simple add on circuit prevents misuse of Land Phone and also indicates whether the Phone lines are Ok or not .It is an ideal tool to test the Telephone lines. It lights LEDs to confirm the signals coming in the Telephone lines. It can also be used as a simple Telephone lock to block outgoing calls.
Continue reading “Telephone Guard. Simple Design 24”

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.
Continue reading “Power Bank. Simple Design 23”

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.

Continue reading “Remote Tester.Simple Design 22”

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.
Continue reading “Transistor Amplifier. Simple Design 21”