This analog to digital converter works on the principle of successive approximation type. Normally the digital to analog converter requires a microprocessor to convert the datas. This circuit is configured using ADC0808. It is 8 bit converter. Thus the circuit avoiding the microprocessor. Click here for the CIRCUIT DIAGRAM.

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This telephone broadcaster circuit can also be used as a telephone amplifier. The main important feature of this circuit is that it can derive the power supply from the telephone lines no external energy is required for the telephone broadcaster. Click here for the CIRCUIT DIAGRAM.

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The recorder turns on when the user lifted the handset. In that similar way the recorder turns off when the user replaced the handset. The x and y points of the recorder is connected to the lines of the telephone. Click here for the CIRCUIT DIAGRAM.

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The line follower is a self operating robot that detects and follows a line that is drawn on the floor. The track following robot follows the black line on the floor. I did this project in my final year. Here i uploaded full report of this project. Click here to DOWNLOAD it.

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The frequency of the transmitter lies within the range of VHL and VFL, This circuit modulated sound signal contains 5.5 -6MHz by tuning C5. Sound modulation is FM and is compatible with TV channel. The transmitter however is working at VHF frequencies between 54 and 216MHz and therefore compatible only with countries using Pal System B and Pal System G.Click here for the CIRCUIT DIAGRAM.

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This circuit can be used to detect indicate if a surveillance device is operative. The problem in making a suitable detector is to get its sensitivity just right; too much and it will respond to radio broadcasts, too little sensitivity and nothing will be heard.
This project has few components, can be made on veroboard and powered from a 9 volt battery for portability.
Surveillance Transmitter Detector. Click here for the CIRCUIT DIAGRAM.

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Stethoscopes are not only useful for doctors, but home mechanics, exterminators, spying and any number of other uses. Standard stethoscopes provide no amplification which limits their use. This circuit uses op-amps to greatly amplify a standard stethoscope, and includes a low pass filter to remove background noise. Click here for the CIRCUIT DIAGRAM.

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