Multi Switch Controlled Relay
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 VCC can be varied from 9V to 15V.
Truth Table
A | B | OUT |
0 | 0 | 0 |
0 | 1 | 1 |
1 | 0 | 1 |
1 | 1 | 0 |
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
