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    Microprocessor Generation of Summed Sine Waves with Random LF Modulation

    A possible single chip approach : Basically this is 4 channels, a fifth could be implemented with DMA and a table. I used DDS on chip to produce the clocks for the WaveDacs. It has a phase accumulator than could be used to FM the DDS with either API call or DMA. You could eliminate DDS and...
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    How far can a gpio from a mc can be used

    Of course there is always UTP and STP (Unshielded Twisted Pair and Shielded TP) to make longer un signal conditioned runs. common mode noise, IR drop, C load considerations.... some of the limitations. You have a unidirectional control signal, so reflections not an issue other than protecting...
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    How far can a gpio from a mc can be used

    The ubiqutous 4 - 20 ma current loop, has been around for eons. https://www.apgsensors.com/about-us/blog/is-your-signal-going-the-distance#:~:text=The%20theoretical%20(emphasis%20on%20%E2%80%9Ctheoretical,limit%20between%20500%CE%A9%20and%201000%CE%A9. LoRa( wireless) , KM kinds of distances...
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    Low noise Preamplifier

    Some questions / observations : 1) What does noise look like, eg. scope capture ? 2) Have you looked at spectrum of noise for clues ? 3) Your bypassing on OA power pins seems a little unusual, eg. has the ceramic for HF noise but nothing (tantalum) for LF noise. And what is purpose of 10 ohms...
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