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PROJECT BASICS
POWER SUPPLY
SENSORS
RELAY
WHERE & HOW to USE
HOW it WORKS
Using CURRENT BUFFER to SWITCH RELAY
CURRENT BUFFER
BIDIRECTIONAL CURRENT BUFFER
PARALLEL PORT
LEVEL SHIFTER
WIRELESS COMMUNICATION
PROJECT IDEAS
 

 

 

USING CURRENT BUFFER TO SWITCH ON RELAY:

When the input signal is weak, it can’t trigger the relay as we require minimum value of current to switch the state of relay. So to amplify the current we use the current buffer IC as shown below:

When the input signal is low, there is no voltage difference across pin1 and 2. Hence bulb doesn’t glow. How ever when the input signal is HIGH, voltage difference is supplied at pin 1 & 2 with amplified current and relay gets switched on, the bulb glows.

 

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