The adapter for a conversation recording on a dictophone from telephone line АD-3

The adapter is intended for dictophone connection to a telephone line. Record inclusion occurs automatically at tube removal (in a mode of VOX-voice-activated control of a dictophone). The device is calculated on application with any phones on any lines, except coupled with блокиратором.
The adapter does not render influence on quality, audibility and other parametres of telephone conversation. Does not add hindrances at inclusion and dictophone deenergizing.