.. peak value to the signal end of R1, and adjust R8 for zero indication on the meter. Now apply the maximum level I chose +10 dBu and set R11 for full-scale deflection. R8 must be set first, then R11. Temperature stability is good. According ...
.. D3/R4 bootstrapping R3 to give a linear fall in voltage equivalent to 20 dB in 1.7 s, which, more by happy accident than by design, is exactly what we want. Now we pass the signal through D4, whose tempco of about 2 mV/ C compensates for ...