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Resistance Measurement Using Sample and Hold Method

A sample and hold circuit, as the name implies, samples an analogue input signal and holds its value until the input is again sampled. Fig....

Doorbell with Security Feature

This doorbell system works such that when someone presses your calling bell switch during the night, not only the bell rings but the bulb...

Infrared Remote Control Timer

The circuit comprises two sections, namely, the transmitter section and the receiver section. Fig. 1 shows the IR transmitter section. The astable multivibrator NE555...

Low-Range AM Radio Transmitter

Here is a simple radio transmitter for transmission up to 25 metres. It is basically an AM modulator whose signal can be received on...

Automatic Water Pump Motor Controller

Municipal corporations in many cities supply water during early morning hours. So, you have to wake up early, just to switch on your motor...

Infrared Proximity Detector

This proximity detector using an infrared detector (Fig. 1) can be used in various equipment like automatic door openers and burglar alarms. The circuit...

INTRUDER RADIO ALERT SYSTEM

Consider a situation where a burglar has entered your house and snapped the telephone wires, leaving you with no means of communication with the...

IR REMOTE SWITCH

Imagine the convenience of selecting TV channels using your remote and then pointing the same remote to your switchboard to switch on/off the fan...

FASTEST FINGER FIRST INDICATOR

Quiz-type game shows are increasingly becoming popular on television these days. In such games, fastest finger first indicators (FFFIs) are used to test the...

REMOTE-CONTROLLED POWER- OFF SWITCH

Remote controllers for various audio/ video systems are usually provided with a power ‘on’/‘off’ or standby-mode selector button. But turning the system off from...

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