Now a days, controlling of appliance is simple with the help of electronics circuit and all of us want to control appliance in multi step. Here is a control circuit for relay which could very useful to control appliance with multi switch.

Circuit Description of multi switch controlled relay

This whole circuit of multi switch controlled relay is fabricated around four 2-input EX-OR gates IC CD4077. The logic of multi switch controlled relay is quite simple and can be understand by everyone. The truth table for EX-OR gates for different input is shown below.

The value of V_CC can be varied from 9V to 15V.

Truth Table

PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R₁ – R₄ = 4.7 KΩ

R₅ = 15 KΩ

Semiconductors

IC₁ = CD4077

T₁ = BC547B

D₁ = 1N4148

Miscellaneous

SW₁ – SW₄ = Push to on/off switch

RL₁ = 6V 100 Ω relay