A melodious bell from... a wrist watch. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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I had an imported electronic watch in a metal case with a faulty indicator. There are many names for watches of this type (for example, "Montana"), but they are all the same. With the current time on the indicator, the melody is turned on by constantly pressing the "AL.TM" button and briefly pressing the "DATE" button. This principle is implemented in the call. The watch battery is replaced with an A343 element, it lasts for several years. The element is best soldered, because. salt often appears on the "-" and it oxidizes. Instead of a piezo emitter, a load is necessarily turned on - a capacitor C1 of the KM type (between the watch case and the "spring").
(click to enlarge)
An amplifier based on a transistor of the KT829 (KT827) type with a large Vst is added, the load of which is a speaker of 0,5 W, 4 ohms. Moreover, for some hours the volume turned out to be insufficient, I had to add an additional amplifier to the KT3102D. The power supply is the simplest 15 V rectifier with a permanent connection of the primary winding to the network. Because some melodies have a long playing time, which is undesirable for a call; it is supplemented with a time relay that limits the playing time to a few seconds. The scheme is borrowed from [1]. Establishing a time relay - in the same place.
Literature
- Radio.-1990.-N 2. c.32.
Author: K.Kulikov, Samara; Publication: N. Bolshakov, rf.atnn.ru
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