Voltmeter on the microcircuit K1003PP1. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Voltmeter on the chip K1003PP1. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Voltmeters with a discrete LED scale in some cases are preferable to pointer meters. So, amateur discrete indicators are widely used to control the on-board voltage in a car. A typical example of such a device was presented in the article by G. Gvozditsky "Indicator of the voltage of the on-board network" ("Radio", 1992, No. 7).

Below is a description of a similar device with almost the same capabilities and principle of operation, but made not on five, but on just one chip. In addition, it is more than ten times more economical.

The very first of the devices for monitoring the voltage of the on-board network published in the journal "Radio" are built on two or three LEDs and indicate only that the voltage at one time or another is within certain known limits, sometimes very wide. Such indicators cannot give a more accurate voltage value.

Subsequently, the authors of publications began to divide the controlled stress interval into a larger number of narrow sections. The accuracy of voltage estimation has increased, but the complexity of the indicators has proportionally increased.

A very successful circuit design of the indicator was proposed by O. Klevtsov in the article "On-board LED voltmeter" in Radio, 1998, No. 3, p. 54, 55, 60. The device contains a resistive voltage divider and threshold devices on the logic elements of the K561LN2 digital microcircuit. The display panel of the device is a line of six LEDs indicating voltage in the range of 10 ... 15 V in 1 V increments.

Thus, O. Klevtsov's device without stretch can be considered a voltmeter, although not very accurate. Increasing the accuracy by increasing the length of the resistive divider and the number of threshold devices leads to an unjustified complication of the device, and most importantly, to great difficulties in calibrating the scale.

The best way out is to use a specialized K1003PP1 microcircuit. It is designed to control a continuous or discrete LED scale and is the simplest analog-to-digital converter containing a resistive voltage divider and a set of comparators and current switches - according to the number of display cells.

The voltmeter circuit is shown in fig. one.

Voltmeter on the chip K1003PP1

The device allows you to visually control the voltage of the car's on-board network in the range from 9,5 to 15 V in 0,5 V increments. The maximum current consumption does not exceed 20 mA.

Diode VD1 protects the device from supplying input voltage in reverse polarity. Zener diode VD2 fixes the lower limit of the scale. Capacitors C1 and C2 smooth out random surges of on-board voltage. A reference voltage source is assembled on resistor R2 and zener diode VD3, which determines the indication step.

Only one LED lights up on the voltmeter display, corresponding to the current value of the on-board network voltage. For the scoreboard, it is better to choose HL1-HL3 and HL9-HL12 red LEDs, and HL4-HL8 - green. Then, even with a cursory glance at the scale, the driver will receive information about whether the voltage is within the normal range (11,5 ... 13,5 V) or has gone beyond them.

All parts of the voltmeter are mounted on a printed circuit board made of foil fiberglass with a thickness of at least 1,5 mm. The drawing of the board is shown in fig. 2. The design of the board is designed for cutting technology. Blackened areas where the foil is missing.

Voltmeter on the chip K1003PP1

You can make a board and etching method. In this case, the layout of the conductor patterns "under the cutter" allows you to get a significant savings in ferric chloride.

I placed the assembled board in an audio cassette case.

The leads of the LEDs are bent at a right angle so that after mounting their optical axes are parallel to the board. The LED lenses are passed through holes drilled in the long side wall of the case. Next to the holes, digitization in voltage values is applied.

All resistors in the voltmeter - MLT-0,125; capacitors: C1 - from the KM series, C2 - K50-35. Instead of AL307B and AL307G, you can use LEDs of the AL307BM and AL307GM series, as well as modern ones from the KIPMO and KIPDO series with a current of not more than 10 mA.

Instead of a two-anode zener diode, any low-power single-anode one for a stabilization voltage of 9,1 V (connected by the anode to resistor R13) is suitable. Diode VD1 - any silicon. The domestic chip K1003PP1 is replaceable by the foreign A277D.

The device does not need adjustment and starts working immediately after switching on.

Author: V.Smirnov, Nazyvaevsk, Omsk region

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