J.E.I. makes standard and custom audio line interfaces and Telephone Line Couplers for use with our analog and digital voice logging recorders. Read about them here: Recorder Audio Connections. If you don’t find what you want here, check out our Custom Audio Equipment Worksheet. We can build what you want.

TC-1B Single line Telephone coupler
TC-2/2CA Multi-line Telephone coupler
TC-3 Handset Telephone coupler
RTC-100R Radio coupler with R/T mixer
RTC-100T Single line Telephone coupler

RC-1 transformer and AC coupled audio line isolator
AD-1 Audio Discriminator VOX control
AM-800 4-wire audio mixer for radio
NF-100 Audio Notch Filter
Tone Decoder for fire department signalling