Refinement of the mode indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices
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In "Radio", 1997, No. 6, p. 42, 43 an article by A. Ledyankin "Battery mode indicator" was published. Some time after I assembled this indicator and started using it on my car, one inconvenience came to light.
The fact is that an LED indicator for the health of the turn signal and brake light lamps was already installed on my car. The use of red and green LEDs in both devices often led to erroneous perception of information, and the pulsed glow mode only aggravated the situation.
For everyone who is faced with a similar problem, I propose to modify the A. Ledyankin indicator by replacing two LEDs HL4, HL5 (according to the diagram in his article) with a seven-element digital indicator. When charging the battery, it displays the symbol "E", and when discharging - "P" with a flashing decimal point. Such an indication more clearly displays the operating mode of the electrical equipment of both the car and the motorcycle.
The diagram of the node to be modified is shown in the figure; the numbering of the elements on it corresponds to the original one. Elements R20, R22, C7 are excluded, but R23, R24 are additionally introduced.
The principle of operation remains the same. When a high level appears at the output of the DD2.1 element, which corresponds to the battery discharge mode, the transistor VT7 opens and turns on the elements e and f of the HG1 indicator. Together with constantly luminous elements a, b and g, an image of the symbol "P" is formed.
At the same time, the operation of the infra-low frequency generator on the elements DD2.3, DD2.4 is allowed. The decimal point h, switched by the transistor VT9, starts to turn on periodically, attracting the driver's attention.
In the charging mode, a high level at the output of the DD2.2 element opens the transistor VT8 and thereby turns on the elements c, d of the indicator - the symbol "E" is displayed. A low level at the output of the element DD2.1 disables the operation of the generator. Transistor VT9 remains closed, so point h on the indicator is off.
Establishing a modified indicator comes down to equalizing the brightness of the glow of the HG1 indicator elements by selecting a resistor R23.
Author: M. Romashchenko, Voronezh
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