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Thanks everyone for replying
Its not working for me but when i interface it with two 1k resistors and one general purpose transistor its working but i can't understand why it is not working with
ULN2003 please help me.
When is interface buzzer in this way
The Buzzer is working properly
But when i interface it in this way
It is not working Why ?
The first three input pins of ULN2003 are connected to three relays ans they are working properly without any problem
Open collector means that the output transistor can only sink current (provide ground) or leave the output floating.
Think of the open drain/collector as a switch to ground, it either provides ground (on) so you get a low output
or leaves the output floating (off) and you get a high output but only if you have a pull up resistor.
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