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close this bookCircuits, Formulas and Tables Electrical Engineering - Basic vocational knowledge (Institut für Berufliche Entwicklung, 201 p.)
close this folder2. Bell Circuits
View the document(introduction...)
View the document2.1. Direct-current Bell
View the document2.2. Alternating-current Bell
View the document2.3. House Bell Installation
View the document2.4. Alarm Systems

2.1. Direct-current Bell


Direct-current bell to be actuated from one place


Direct-current bell to be actuated from two places


Bell installation for reciprocal calls


Sell installation for reciprocal calls with key change-over switch


Bell installation for reciprocal calls with switch-on push-button, line-saving


Bell installation for reciprocal calls, line-saving