About some modifications of the PHONE MASTER telephone server and the CALKOFON caller ID set-top box. Scheme, description

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About some modifications of the PHONE MASTER telephone server and the CALKOFON caller ID set-top box. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Telephony

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Multifunctional phone with caller ID (server) "Phone Master" and caller ID set-top box "Kalkofon", developed by "Telesystems", undoubtedly lead the market, since their undoubted advantage is energy independence, i.e. they do not have blocks connected to the power grid nutrition. Nevertheless, sometimes you have to replace the batteries built into the devices. The improvements related to this are described in the proposed article.

Having refused mains power, the developers of caller IDs managed to eliminate the "freezes" of these devices during a short-term power failure in the mains and the telephone line short circuits associated with this, as well as erasing or corrupting data in memory in the event of a long absence of mains voltage. However, along with undoubted advantages, these devices also have disadvantages, which include the use of galvanic cells. Despite the extremely low current consumption, galvanic cells are still discharged, and according to the "sandwich law" this happens unexpectedly and at the most inopportune moment.

A one and a half year operation of the "Phone Master" server showed that even fresh, high-quality ("brand") elements of Japanese production ensure the normal operation of the device for 6...8 months. After that, the brightness of the lamps illuminating the liquid crystal indicator noticeably decreases, and the LCD itself loses contrast, which reduces its viewing angle. In addition, the volume level drops in the "Speakerphone" mode (talking without lifting the handset).

Older models of the device were equipped with built-in batteries from four series-connected disk batteries, but, apparently, due to their low quality, the manufacturer switched his products to power from three AA type galvanic cells (316). Studies have shown that the battery compartment terminals are still supplied with charging current (if the phone is connected to the line). This prompted the idea to install instead of galvanic

elements "finger-type" batteries of imported production (in particular, the author used batteries from the company "Varta"). Since the power compartment is designed for three elements, and four are needed to obtain the required voltage, the fourth had to be placed inside the body of the device (where there is a lot of free space) and connected in series to the main three. It is better not to use domestic batteries!

As a result, "Phone Master" has become a truly energy-independent and completely autonomous device, retaining all its excellent qualities and service capabilities. Since the batteries are recharged with a low current, the possibility of their overcharging and the damage associated with this is completely excluded.

Caller ID set-top box "Kalkofon" has two built-in power supplies: a "clock" battery (similar to the domestic STs-32) for the operation of the calculator in low light conditions, when the solar battery is not able to provide normal voltage for the operation of the device, and a lithium battery type CR2032 , feeding the AON board.

The calcophone works stably and trouble-free as long as both of these power sources provide the required voltage (1,5 and 3 V, respectively). After some time, when the elements "shrink" a little, the device malfunctions: the LCD "turns pale" in low light, and the calcophone does not clearly perform certain functions and some commands.

You can extend the period of reliable operation of the calcophone by installing a "hour" element of a larger capacity, for example, STs - 0,18 or similar (it is identical in diameter to the STs - 32 element, but a little "thicker", although this does not interfere with its installation in the appropriate socket). It is possible to place inside the body of the calcophone a larger, and therefore, in terms of capacity, element with a voltage of 1,5 V by soldering connecting wires to it.

It is also advisable to replace the lithium element with a more capacious one, for example, CR2325 (or BR2325). There is more than enough space inside the calculator case for this. It is necessary to isolate the lithium cells to avoid shorting them to the boards, and also fix the cells in the case with adhesive tape or foam pads.

The latest model calcophones are equipped with a switch that breaks the power circuit received from the lithium cell. Do not forget to turn off the set-top box if you plan to disconnect it from the telephone line for a long time. It is also useful to ensure that in the off state of the calcophone, no key is accidentally pressed, since in this case the "hour" element will become discharged rather quickly.

Author: P.Mikhailov, Moscow

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