Dynamic indication. Scheme, description

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Dynamic indication

Radio - for beginners

The total number of conductors connecting the indicator microcircuits increases sharply with an increase in the number of indicators used in digital technology devices. Therefore, digital indicators often began to be manufactured in multi-digit blocks, which in a single housing can have from four to 16 digital characters (for example, the IVL indicator 1-7/5). In order to reduce the number of pins in a multi-digit indicator, all anode elements of the same name are connected together and have one common pin. To control the glow of a digit, fluorescent indicators have a control grid, and for LED indicators, each familiarity (digit) has a common output, which can be a common anode or a common cathode of the LED elements.

To ensure the operation of multi-digit indicators or several single-digit indicators, the so-called dynamic, that is, continuous indication, is used. Whatever its technical embodiment it may be, its essence lies in the fact that the information from the counters of the device does not go to several decoders, as it was, for example, in the frequency meters we described, but to a common decoder for all in portions. This decoder, or rather the code converter, is connected to all elements at once with its outputs. The illumination signal of a certain familiarity arrives synchronously with the counter from which information is received at that moment. In other words, in the dynamic indication system, a high-speed proximity switch with many positions, as it were, works. In one of its positions, all the outputs of any counter (digit) are connected to the corresponding inputs of the decoder. And at the same moment, a signal for controlling the illumination of the elements of that familiarity that corresponds to this category comes through the switch.

A diagram of a device that uses one of the dynamic indication options is shown in Fig. 1.

It is an information block that can be used, for example, in a frequency meter based on K155 series microcircuits or another measuring and information device.

Chips DD1-DD4 form a four-digit pulse counter. On the elements DD10.1, DD10.2, a clock pulse generator is assembled, which sets the rhythm for switching information from one counter to another and, consequently, the speed of switching familiarity. The frequency of this generator is usually chosen in the range from 1 to 10 kHz.

The pulses generated at the output of the clock generator control a four-stroke distributor formed by D-flip-flops DD11.1 and DD1I.2 and elements 2I-NOT DD12.1-DD12.4. Control pulses from the outputs of these elements are fed (through resistors R9, Rll, R13, R15) to the transistor keys VT1-VT4 and to the keys made on the logic elements of the DD5-DD8 microcircuits. Inverters DD13.1-DD13.4 change the phase of the signals so that the level of control pulses received at the inputs of the DD5-DD8 microcircuit elements is high.

At that moment, when a high logic level signal is supplied to the lower inputs of the DD5 microcircuit elements from the distributor, information from the outputs of the counter DDl is supplied (through inverters DD9.1-DD9.4) to the inputs of the decoder DD14. At the same moment, a low-level pulse opens the transistor switch VT4, as a result of which the elements of the HG1 indicator light up, displaying information from the output of the counter DDl. At the next cycle of the dynamic system, information from the output of the counter DD2 through its keys - elements of the DD6 microcircuit - enters the inputs of the same common decoder DDI4. Now the transistor key VT3 opens, thereby providing illumination of the HG2 indicator elements. Further, information is taken from the outputs of the counters DD3, DD4, again from the outputs of the counter DDl, etc. Passing through the keys, the function of which is performed by the elements of the DD5-DD8 microcircuits, this information is inverted. To restore its previous phase, inverters of the DD9 chip common to all discharges are included in front of the decoder.

On the front panel of the information block, the HG1-HG4 indicators are positioned so that the HG1 indicator is the far right, and all the others to the left of it in ascending order of number.

In the dynamic indication system, when using LED indicators, decoders K514ID1, K514ID2 are used as a converter into a seven-element code. The decoder K514ID1 is used to work with indicators with a common cathode, and K514ID2 - with a common anode. The K514ID1 decoder contains built-in current-limiting resistors, which are not found in K514ID2.

To increase the number of information bits in such a block, you need to add the required number of pulse counters, perform a distributor for the required number of familiarity spaces, respectively increase the number of single-digit digital indicators or replace them with a multi-digit indicator, for example, ALS318, ALS311.

How can such a unit be docked with a frequency counter on K155 series microcircuits (according to the diagram in Fig. 75). To do this, its clock generator on the elements DD10.1 and DD10.2 must be excluded, and to synchronize the operation of all microcircuits, use pulses with a frequency of 1 or 10 kGd. which are removed from the divider of the block of the reference frequency of the frequency meter and fed to the input C (output o) of the trigger DD11.1. And the "Reset" input of the information counters of the block is connected to the output 8 of the DD11.3 element, from where the reset signal is taken to the frequency meter control unit.

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