How to prolong the life of watches Electronics 2-08. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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Back in 1992, I purchased two copies of the electronic desktop clock "Electronics 2-08". They are made on microcircuits K176IE18, K176IE13, K176IDZ according to a scheme similar to that given in the article by V. Bannikov "Electronic clock from the radio designer" Effect-4 "(" Radio ", 1993, No. 10, pp. 28-31, fig. 3).
In both watches, the brightness of the IVL1-7/5 indicator gradually decreased, and after only a year, the numbers became barely distinguishable. The indicators had to be replaced and this operation repeated four times over the past 10 years.
The replacement (taking into account differences in the pinout and filament voltage) of the IVL 1-7 / 5 indicator with UI-4 did not give a positive result - the same as in the Elektronika 6.03 watch on the KA1035HL1 chip, where the indicator has been working without replacement for nine years . Without fail, and almost retaining the original brightness, the indicator IVL 1-7 / 5 serves in a home-made watch, assembled many years ago according to the above-mentioned V. Bannikov scheme.
All this led to the idea to investigate the "strange" clock and find the cause of the damage to the indicators. The check showed that all supply voltages are normal, however, the pulses at the outputs of the K176IDZ code converter have a complex three-level shape, which is not observed in the clock according to the V. Bannikov scheme. When examining the factory printed circuit board, it was found that there are no resistors provided for in a home-made watch connecting pins 9-15 of the K176IDZ microcircuit with a negative polarity power source. There are not even holes and contact pads for their installation.
The missing resistors (R1-R7) were installed in a hinged way according to the diagram shown in the figure. Here C1 is the rectifier filter capacitor present in the clock. The voltage values are indicated relative to the common wire, with which the outputs 8 of the K176IDZ code converter and other microcircuits are connected in the clock.
After completion, the shape of the pulses at the terminals of the converter and the indicator IVL 1-7/5 connected to it became the same as in a home-made watch. It is too early to judge the service life of the indicator installed instead of the one that lost its brightness, but since then, a gradual decrease in brightness has not been observed, which is typical for all indicators before revision.
As far as the author knows, unjustified "savings" of several resistors, leading to premature damage to the indicator, is found not only in "Electronics 2-08", but also in desktop electronic clocks similar in design, released under other trademarks.
The installation of the resistors in question is provided for by a typical circuit for switching on the K176IDZ code converter, the outputs of which (unlike the outputs of the K176ID2 similar in structure) are made with an "open" drain. It is strange that the watch manufacturer neglected this.
Author: A.Butov, village of Kurba, Yaroslavl region
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