Testing of 8 Channel Relay Card With ULN2803 on General Purpose PCB | ElectroMech Lab

#Relays are used to control high voltage loads, a signal from microcontroller or #Arduino of 3.3/5vdc can control a 230V load, with the help of relay circuit.
In this video I am showing 8 relays circuit assembled on general purpose PCB.
Component:
General Purpose PCB: 1 No.
24vdc relay : 8 Nos.
IN4007: 1 No. (To protect is from reverse polarity)
#LED 5mm Red: 9 Nos. (for relay indication)
Resistors 10 KOhm: 9 Nos. (limiting resistor for LEDs)
Connectors. 13 Nos. (2 pin) (foroutput & Input Connections)
IC: #ULN2803 1 No. (Relay Driver IC)
IC Base socket 18 Pin: 1 No. (Relay driver IC base socket)

[@lambert8443]

I have an essential question, once we use ULN2803, can we do without the free-running diode for the relay?
thank you.

[@ElectroMechLab]

Hi, since ULN2803 has inbuilt free wheel diodes, so no need to connect external diodes for this purpose, the thing which you need to do is to connect COM pin to +power supply.

[@lambert8443]

thank you for the answer, I have already connected diodes I hope it does not spoil anything

[@kanukamliya5242]

circuit diagram??