Hello,
I'm doing a comparator using LM393.
Input/output parameters:
inverting input: 20VAC (effective value)
non-inverting input: 0V (GND)
supply voltage: 3.3VDC
Expected behaviour:
0V - when Vin <0
3.3V - when Vin>0
My circuit looks like this:
In PSpice everything looks fine:
But real circuit doesn't work properly. It looks similar to this:
I don't know in which exact moment of time there is high voltage (3.3 V), cause I have only one-channel oscilloscope.
I suppose this problem can be related with GND.
I will be grateful for any help.
Greetings,
Michal
I'm doing a comparator using LM393.
Input/output parameters:
inverting input: 20VAC (effective value)
non-inverting input: 0V (GND)
supply voltage: 3.3VDC
Expected behaviour:
0V - when Vin <0
3.3V - when Vin>0
My circuit looks like this:
In PSpice everything looks fine:
But real circuit doesn't work properly. It looks similar to this:
I don't know in which exact moment of time there is high voltage (3.3 V), cause I have only one-channel oscilloscope.
I suppose this problem can be related with GND.
I will be grateful for any help.
Greetings,
Michal
Last edited: