Combiset adapter for correcting the readings of the car's electronic speedometer. Free Technical Library article

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Combiset adapter for correction of vehicle electronic speedometer readings

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic devices

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COMBISET program allows you to correct the readings of electronic speedometers on domestic cars. The program works through a COM port with a special adapter. Below are 2 options for the adapter scheme.

First option

The classic transistor circuit that is found on most sites.

Combiset adapter for correction of vehicle electronic speedometer readings

The second option

The proposed version of the Combiset adapter fits perfectly into the body of the DB-9 connector (however, without a multivibrator). A multivibrator is needed only for Vladimir panels (AP), so as not to poke wires (B or C) with a certain frequency at the roller reset input. The MC1489 or SN75189 chip is nothing more than a specialized quad RS-232 (COM port) to TTL level converter. You can find the above chip on some very old ISA multicards.

To work with the panels you need a program Combiset, which can be bought at http://chiptuner.ru/content/shop_sms.

Publication: cxem.net

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