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Graham33

Nov 6, 2023
2

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

Harald Kapp

Moderator
Moderator
Nov 17, 2011
13,476

Why are my circuits not working in practice?
• 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

Nov 6, 2023
2

• 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

Feb 1, 2023
161
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.

Feb 19, 2021
677
I get the following sim -

Regards, Dana.

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