Help

[Graham33]

Why are my circuits not working in practice? One is a schmitt trigger and the other amplifies and DC biases the signal.

 

[Harald Kapp]

"Help" is not a helpful headline to describe your problem.

Why are my circuits not working in practice?

Please be more specific:

• What is each circuit supposed to do / how is it expected to behave?
• What does the repective circuit do instead? Which is the misbehavior you see?
• What kind of source do you use to generate the signals?
• What kind of instruments do you use to check the behavior?

 

[Graham33]

"Help" is not a helpful headline to describe your problem.


Please be more specific:

• What is each circuit supposed to do / how is it expected to behave?
• What does the repective circuit do instead? Which is the misbehavior you see?
• What kind of source do you use to generate the signals?
• What kind of instruments do you use to check the behavior?

The schmitt needs a square wave from 0V to 3.3V, and the level shifter needs to amplify and bias so that the output is 4V peak to peak (1V-5V). At the moment neither of the circuits given me an output, the schmitt trigger gave me a dc signal around 3.3V. The level shifter gives a similar result. Function generator for the 0.5V peak input, with a frequency that varies from 500Hz to 2kHz. An oscilloscope is used to check the output signals.

 

[bidrohini]

The schmitt needs a square wave from 0V to 3.3V, and the level shifter needs to amplify and bias so that the output is 4V peak to peak (1V-5V). At the moment neither of the circuits given me an output, the schmitt trigger gave me a dc signal around 3.3V. The level shifter gives a similar result. Function generator for the 0.5V peak input, with a frequency that varies from 500Hz to 2kHz. An oscilloscope is used to check the output signals.

I think you need to troubleshoot the circuit part by part. Measure voltage with a multimeter at different points and see where the abnormality is taking place. Also, check the continuities of your wires.

 

[danadak]

I get the following sim -




Regards, Dana.