To be able to measure the bipolar amplitude as well as do frequency counting, the A to Synth blog shows a very simple circuit:
It attenuates and shifts a full range signal, +12V to -12V, to 0 to 5V. The signal is inverted but that can be compensated for in the measurements.
The output of the circuit is then sent to a comparator where it is compared with a 0-5V CV, allowing us to detect amplitudes over the full 24V swing. In practice, the swing will be +/-10.5V due to limitations in the TL07x op amps, but that’s ok.
The details are in the post here.
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- Source: https://blog.adafruit.com/2024/05/01/measuring-signal-amplitude-and-frequency/
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