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Analog Multiplexer for ADC Stm32f103c8t6
Posted: Wed Mar 17, 2021 4:58 am
by mingu
Is it possible for an analog multiplexer to convert a biopolar signal to a unipolar signal? I'd like to use a homemade oscilloscope to measure positive and negative voltage.
Thanks!
Re: Analog Multiplexer for ADC Stm32f103c8t6
Posted: Wed Mar 17, 2021 1:31 pm
by LeighM
As you probably realise, the ADC will only be capable of accepting input voltages between its power rails.
So you would need to buffer the signal with an Op Amp so as to provide a gain or signal reduction
as well as an offset such that 0v at the test point gives mid-rail at the ADC input.
Google some Op Amp circuits
Re: Analog Multiplexer for ADC Stm32f103c8t6
Posted: Thu Mar 18, 2021 4:07 am
by mingu
sounds good, I'll try. Big thanks!
Re: Analog Multiplexer for ADC Stm32f103c8t6
Posted: Fri Mar 19, 2021 7:22 am
by chipfryer27
Hi
Following on from Leigh, this gives some examples of what you are trying to achieve.
https://ocw.mit.edu/courses/media-arts- ... 2_bias.pdf
Regards