Looking Into The Brain For Lie Detection

Though the reliability of brain scanning for lie detection is still under question, these tests are fast becoming popular with the crime investigating teams. Here’s how they work DR S.S. VERMAPolice use...

PROGRAMMABLE DOOR- BELL WITH FLASHING LEDS

IC1 (NE555) is used here as a clock generator. It is configured as an astable multivibrator whose frequency can be adjusted with the help of potmeter VR1. The clock pulses obtained...

FRIENDLY CHARGER FOR MOBILE PHONES

Most mobile chargers do not have current/voltage regulation or short-circuit protection. These chargers provide raw 6-12V DC for charging the battery pack. Most of the mobile phone battery packs have a...

FLASHING-CUM-RUNNING LIGHT

This circuit generates flashing lights in running pattern. In conventional running lights, the LEDs glow one by one. In this circuit, the LEDs flash a number of times one by one.The...

ULTRA-BRIGHT LED LAMP

This ultra-bright white LED lamp works on 230V AC with minimal power consumption. It can be used to illuminate VU meters, SWR meters, etc. Ultra-bright LEDs available in the market cost...