Funny call. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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An unenviable situation: the guests approached, but it was difficult to notify the owners about this - when the apartments more and more began to resemble either fortresses or prisons with armored bulletproof entrance doors at the entrances, on the floors and bars on the windows.
Electric calls can partly solve the "signal-information" problem. But most of them need a household 220-volt network (moreover, electricity is consumed both when the "tram trill" is given and in the standby mode), which is by no means unsafe. Against this background, electronic musical calls look advantageous, only now they are not cheap.
The device I propose here, one might say, is almost out of competition. First, it's homemade. Secondly, it is made on the basis of a conventional broadcast loudspeaker, contains a minimum of details and is able to give a sufficiently strong sound signal, because the emitter is a speaker. Thirdly, the power supply of such a signaling device is carried out from an autonomous low-voltage source (batteries). Fourthly, the device does not consume energy in standby mode, it is absolutely safe and can be used not only as a house call, but also as an audible indicator in the security system. Moreover, contact buttons, a reed switch or other sensors that work on a circuit can be located at a distance of up to 100 m from the sound emitter itself.
Schematic diagram of a home-made bell based on a subscriber loudspeaker and a variant of its use as a security device, as well as a multi-tone ("Children" - "Adults") sound signaling device for the arrival of guests.
Due to the small number of parts, it makes no sense to make a printed circuit board. Installation is carried out in a hinged way, well known to everyone from school physics lessons. As soldering supports, the outputs of the speaker, transformer, 68-kilohm potentiometer are used.
The volume control of the base loudspeaker - R1 on the circuit diagram - performs the function of the pitch control of the generated signal, which is set as desired. The switch (toggle switch, button or other contact connector) is placed in a convenient place at the entrance to the entrance, section on the floor, at the front apartment door.
Any of the low-power germanium MP1 - MP39 will fit as a transistor VT42. The choice of resistor R2 (as well as R3 and R4 for a non-standard use of the call) is just as uncritical: the most common VS, MLT, ULM with a rated power of 0,125 W or more will do. Capacitor - of any type (as well as reed switches that work on a circuit, if this sound signaling device is to work in a security system). Elements R1, T1 and BA1 - from the broadcast loudspeaker.
It happens that a correctly assembled call does not work when the power is connected. Then you should swap the ends of one of the windings of the transformer T1. However, the lack of generation at an audio frequency may also be a consequence of the substandard transistor VT1. In this case, you will have to replace it with another one with a higher gain.
If the range of pitch tuning by potentiometer R1 does not suit the owners, then it is easy to change it by selecting the capacitance of capacitor C1. But the sound of this call also depends on the supply voltage, which can be used, for example, for multi-tone signaling when guarding several objects, personifying callers ("Children" - "Adults") by introducing a low-resistance resistor into the circuit (in series with one or another switch). By changing the pitch of the call, one can also judge the degree of discharge of the power source and timely change a run-down galvanic cell or battery with new ones. Just do not forget about the observance of polarity, because the transistor does not tolerate polarity reversal.
Author: V.Besedin
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