Wayne Parham Messages: 18789 Registered: January 2001
Illuminati (33rd Degree)
I think Eric Wallin mentions the use of a substitute microphone in his articles. Maybe you're wanting to use something like a Panasonic WM-60AY microphone cartridge. There's a preamp schematic for this microphone posted here, but you won't need it for use as a replacement mic in your SPL meter.