G
Guest
- Jan 1, 1970
- 0
I'm trying to come up with an LCD dBv meter. Not the bargraph type but a
numeric LCD type. It needs to have a range of +30 down to -70. 100 dB total range.
the reference is .775V = "0" dBv. I want to use one of the PIC's for the controller.
My question is should I use a Log amp to do the log calculations or think about doing it
in software. The smaller pic's I've looked at don't offer much math capability.
To do the calculations in hardware I think I'll need an RMS to DC converter,
and a LOG amp. Then I would read the output of the LOG amp into the A/D converter in the PIC.
Any Ideas?
Thanks
numeric LCD type. It needs to have a range of +30 down to -70. 100 dB total range.
the reference is .775V = "0" dBv. I want to use one of the PIC's for the controller.
My question is should I use a Log amp to do the log calculations or think about doing it
in software. The smaller pic's I've looked at don't offer much math capability.
To do the calculations in hardware I think I'll need an RMS to DC converter,
and a LOG amp. Then I would read the output of the LOG amp into the A/D converter in the PIC.
Any Ideas?
Thanks