Multi-function phone with caller ID (server) "Рhоnе Маstеr" and caller ID-prefix "Kalkofen", developed by the company TeleSystems, no doubt, lead the market, as their the apparent advantage is the volatility, i.e. they do not have connected to the mains power supply units. However, sometimes you have to replace the batteries built into the apparatus. Refinement associated with this is described in the article.
Refusing to utility power, the developers of caller ID managed to resolve hang these devices at short-term voltage drops in the mains and related circuits of the telephone line, as well as erasing or the distortion of data in memory in case of prolonged absence of the mains voltage. However, along with the undoubted advantages, these devices have disadvantages, to which should include the application of the galvanic elements. Despite extremely low supply current, galvanic cells still exhausted, and by the law of a sandwich," that happens unexpectedly and at the most inopportune .
A year and half of operation of the server Рhоnе Маstег" showed that even fresh, qualitative ("brand") elements of the Japanese production provide the normal operation of the device within 6 to 8 months. After that noticeable decreases the brightness of the lamps illuminating a liquid crystal display, and the LCD itself loses contrast, which reduces the angle of visibility. In addition, the level falls the volume in the "Speakerphone" (a conversation without lifting the handset).
Older models of the apparatus staffed with built-in batteries of four series-connected circular batteries, but apparently because of their low quality manufacturer moved its products powered by three galvanic AA batteries (316). Studies have shown that the terminals of the battery compartment still charging current is supplied {if the phone is connected to the line). It prompted microstrobili instead of galvanic
elements "AA" batteries imported (in particular, the author used batteries firms "Vаrta"). Since the battery compartment is designed for three element, and to produce the required voltage need four, the fourth had to be accommodated inside the housing of the device (where a lot of free space) and to connect in series to the main three. Domestic batteries not better use!
As a result, "Рhоnе Маstег" has turned into a truly non-volatile and fully self-contained unit, retaining all its excellent quality and service opportunities. Since the charging of batteries occurs a small current, the possibility of apertured and related damage is completely eliminated.
Telephone caller ID-prefix "Kalkofen" has two built-in source power supply: the "clock" battery (similar domestic SP-32) to work calculator in low light conditions when the solar battery is not in able to provide a normal voltage for the operation of the device, and lithium battery type СR2032 that fuel charge caller ID.
Kalkofen steadily and smoothly works as long as both of these sources power supplies provide the required voltage (1.5 and 3, respectively). Through some time, when the elements a little "sit down", with the device observed failures: the LCD in low light "fades" and kalkofen clearly performs separate functions and some commands.
Extend the period of stable operation of kalapana may set a "time" element larger capacity, for example, SP - 0,18 or similar (it is identical to the diameter item SP - 32, but slightly "thicker", although this does not prevent you install it in appropriate slot). Can be placed inside the housing of kalapana and more size, and hence the capacitance element 1.5 V solder to it the connecting wires.
Lithium element is also advisable to replace it with a bigger one, for example СR2325 (or ВR2325). Space inside the housing of the calculator for this is more than enough. It is necessary to isolate the lithium cells to avoid snapping them on Board, and also to fix the elements in the body with a piece of adhesive tape or foam spacers.
Kalkofen latest models are fitted with a circuit breaker that disconnects the circuit power derived from the lithium element. You should not forget to turn off the console, if you plan to disconnect it from the telephone line for a long time. It is also useful to ensure that disabled state of kalapana you are not pressed any key, as this "hour" the item will be quickly discharged.
Author: P. Mikhailov, Moscow