These files were originally in the MicBuilders file area but the file space is getting full, so I will host them here
on my own web site.
RCA
Excerpt from RCA catalog about microphone loading (2464k)
Langevin 4000 Series
Part 1 of Langevin Catalog covering 4000 series modules (4828k)
Part 2 of Langevin Catalog covering 4000 series modules (3046k)
Sony ECM377 LDC Electret
Data Sheet Page 1 (189k)
Data Sheet Page 2 (130k)
Schematic Page 1 (941k)
Schematic Page 2 (1199k)
Schematic Page 1, high rez (1541k)
Schematic Page 2, high rez (1870k)
Sony C500 LDC
Data Sheet Page 1 (105k)
Data Sheet Page 2 (160k)
Schematic (880k)
Schematic, high-rez (1583k)
Sony ECM737 Compact Stereo Microphone (built-in MS decoder)
ECM737 service (701k)