Hello everyone! I have found an old circuit that is used to convert audio-level SMPTE/LTC signals back into a 5V square wave that can be understood by digital circuitry. Though I am decently familiar with digital circuitry, my knowledge of analog circuitry is pretty much non-existent. Could someone explain to me how this circuit works and how adjusting the resistors and capacitors would affect the operation of the circuit?
Also, I've found that the audio volume range that this circuit can handle is pretty narrow. Does anyone know of a way I could make this circuit work with a much wider range of volumes, really from the smallest and greatest volume that can be achieved? (Additional circuitry is OK.) Only frequencies between 2000 and 5400 Hz need to be regarded as acceptable. Anything outside this range can be ignored, if that makes a difference on how I could make the volume range greater.
Oh, and by the way, there's usually a 74HC14 chip between the output of the op-amp and the rest of the circuitry. I accidentally deleted that when I extracted this part of the circuit from the rest of the schematic.
Thank you!
Edit for clarity: VCC is 5V
Also, I've found that the audio volume range that this circuit can handle is pretty narrow. Does anyone know of a way I could make this circuit work with a much wider range of volumes, really from the smallest and greatest volume that can be achieved? (Additional circuitry is OK.) Only frequencies between 2000 and 5400 Hz need to be regarded as acceptable. Anything outside this range can be ignored, if that makes a difference on how I could make the volume range greater.
Oh, and by the way, there's usually a 74HC14 chip between the output of the op-amp and the rest of the circuitry. I accidentally deleted that when I extracted this part of the circuit from the rest of the schematic.
Thank you!
Edit for clarity: VCC is 5V
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