Blocker with light indication. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Telephony
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The blocker developed by Merkulov [1], which has proven itself in work, I propose to supplement with LED indicators (VD1 and VD2). Now subscribers of parallel phones can see if the line is free and if they interfere with each other.
Another advantage of the proposed improvement is that when dialing a number, there is no "ringing" on another phone.
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Literature
1. Merkulov A. Telephone quasi-blocker. - Radio amateur, 1994.N9.C.26.
Author: A. Bely, Donetsk region, Artemovsk; Publication: N. Bolshakov, rf.atnn.ru
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