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looking for design ideas for 50kHz tone demodulator

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moffy:
The opto output wil have no problem discharging the cap. It is very common.

JeanF:
vk6zgo, SiliconWizard, thank you for your ideas. I won't have time to try them right now but I'll no doubt keep them for future experiments and learning. I wasn't aware that a PLL could be used as a decoder, good thing to know! And I may look into slicing data before the opto as you suggest, which would allow to buffer it as well. In my existing circuit I'm drawing a few mA from the data line to light the LED of the opto, which seems to be fine for a one-off but that won't scale well if I want more decoders on the same bus.

Zero999:

--- Quote from: JeanF on October 06, 2019, 12:26:15 pm ---Zero999, Yes I'd prefer if the input is isolated. I have absolutely no experience with pulse transformers, I don't know where to start but I'll read up on them. A quick look on wikipedia says that they are used with fast risetime square pulses, and that they must transmit one pulse at a time, so that means I would have to filter and "square up" my trains of ~10 half-sine pulses before going to a transformer, isn't it? In which areas are they better or worse than optocouplers?

--- End quote ---
A pulse transformer will be able to pass a sine wave with no problem. It's the lowest frequency of interest, which is more of a limiting factor with a transformer, than the high frequency content.

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