Hello. I am a novice/intermediate at electronics. I have searched and read like crazy and I have come up with a myriad of possible solutions to my simple problem.
The problem being I have a sensor that outputs a frequency based on it's undisclosed input. The ecu responsible for this machine will throw trouble faults if the frequency gets too high and resorts to proprietary redundant strategies that result in undesirable and unpredictable operation of said machine.
I am simply looking for a way to interrupt the sensor's output (500hz-11,000hz) and cap or limit it's perceived maximum allowable frequency (to 6,000-8,000 hz) without interfering with the signal. The signal must not stop but continue along at the newly capped frequency.
In my readings, it would be analogous to a 0-5v automotive mass air flow clamp, where one would simply place a zener diode of the appropriate voltage between the signal and ground.
I could use a frequency-to-voltage converter, then clamp the voltage and then run it through a voltage-to-frequency converter. That seems really redundant and fraught with error.
I think I could use a Schmitt trigger 555/556 but I'm not sure how to model the output to my needs.
I could program the whole mess into a propeller or stamp chip.
I even tore apart a DSL line filter and did some testing.
I looked into audio notch filters, but they seemed to null out the frequency instead of simply hold it.
I feel there's an elegant and simple solution but I cant see the forest for the trees, as my mentor's used to say.
Thanks in advance for the nudge in the right direction.
The problem being I have a sensor that outputs a frequency based on it's undisclosed input. The ecu responsible for this machine will throw trouble faults if the frequency gets too high and resorts to proprietary redundant strategies that result in undesirable and unpredictable operation of said machine.
I am simply looking for a way to interrupt the sensor's output (500hz-11,000hz) and cap or limit it's perceived maximum allowable frequency (to 6,000-8,000 hz) without interfering with the signal. The signal must not stop but continue along at the newly capped frequency.
In my readings, it would be analogous to a 0-5v automotive mass air flow clamp, where one would simply place a zener diode of the appropriate voltage between the signal and ground.
I could use a frequency-to-voltage converter, then clamp the voltage and then run it through a voltage-to-frequency converter. That seems really redundant and fraught with error.
I think I could use a Schmitt trigger 555/556 but I'm not sure how to model the output to my needs.
I could program the whole mess into a propeller or stamp chip.
I even tore apart a DSL line filter and did some testing.
I looked into audio notch filters, but they seemed to null out the frequency instead of simply hold it.
I feel there's an elegant and simple solution but I cant see the forest for the trees, as my mentor's used to say.
Thanks in advance for the nudge in the right direction.