Quote Originally Posted by Acetronics View Post
Hi, Darrel

Looks you're perfectly right ... the PIC ADC does not have the 60 dB dynamics(? ... I meant range !!!) our friend Ioannis looks for.

IF you were involved in radios ... may be the ref. "CA3089" will remind you some Vu-meter designs ... ( Use of pin 13 ...)

So, If we used such a Log amplifier to translate from Log to lin scale ... we could easily get this 60 dB Scale ... may be more !!!

Of course ... the drawing is in my Dataroom ... and I still must have a PCB somewhere !!! ( Was a very old Elektor application for an Audio Level-meter ( Sonometer) ... as the CA3089 can work with audio frequencies ... )

Read you soon

Alain

PS: found another with a NE604 Chip ...70 dB covered !!! ... heeuuuuuu file weights ... 325 kB DAMNED !!!

Hi, Savnik

+ 3 dB means the double ... for whatever you want.

but + 6 dB for Power means +3 dB for corresponding voltage
CA3089 is a monolithic integrated circuit that provides all the functions of a comprehensive FM-IF system, which include a three-stage FM-IF amplifier/limiter ,a doubly-balanced quadrature FM detector.