Vacuum luminescent indicator IVLSHU1-11/2. Reference data

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Vacuum luminescent indicator IVLSHU1-11/2. Reference data

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Encyclopedia of radio electronics and electrical engineering / Reference materials

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The dual-signal level indicator is designed to work in high-quality household sound-amplifying equipment. The indicator board consists of two lines with 11 elements of green (8) and red (3) glow in each. The signal level is additionally indicated by digitization in units of decibels. The digitization of the switched on indicator shines constantly, and the number of luminous elements in the lines depends on the level of the controlled AF signal. The device is produced in two modifications, differing only in that one board must be placed horizontally in the device (Fig. 1), and the other - vertically (Fig. 2).

Indicator housing - glass, flattened, rectangular shape; conclusions - rigid lamellar tinned. To control the operation of the indicator, a microcircuit is built into it. Weight of the device - no more than 40 g.

Foreign analogue - FG28SB1.

Indicator pinout: pin. 1 - output of the cathode glow; pin. 2 - digitization of the scoreboard; pin. 3 - general; pin. 4 - channel selection signal input; pin. 5 - input 1; pin. 6 - control input 1; pin. 7 - control input 2; pin. 8 - input 2; pin. 9 - negative power output; pin. 10 - output of the cathode and cathode glow; conductive shielding on the inside of the cylinder. The pin numbers should be counted from left to right (Fig. 1) or from bottom to top (Fig. 2), while keeping the device facing you.

Vacuum luminescent indicator IVLSHU1-11/2

Main characteristics

Glow intensity, cd/m², at least, anodes-elements
green glow
red glow
250
70
Glow intensity, cd/m², not less, at the end of the guaranteed operating time for anodes-elements
green glow
red glow
125
35
Contrast, %, not less 60
Viewing angle, degrees, not less 40
Information field dimensions, mm 54x17
Number of controlled anodes-elements 23
Rated cathode filament voltage, V 2,4
Voltage on anodes-elements, V 27 33 ...
Cathode glow current, mA
limit values
nominal value
140 170 ...
160
Number of glow plugs, not less than 10⁴
Ready time after switching on, s, no more 0,1
Guaranteed operating time, h, not less 30 000
Working range of ambient temperature, °C -45 ... + 40

The main characteristics of the embedded microcircuit

Supply voltage -27...-33
Voltage between the cathode and the common wire, V (The difference between the supply voltage of the control chip and the cathode voltage - the common output should not be less than 3 V) -24...-30
Channel selection signal voltage (pin 4), V, for level
high, no less
low, no more
-1
-9
Voltage at control inputs 1 and 2, V 0 ...- 8
Leakage current, µA, no more,
at the switch input
by analog inputs
5
10

Parameter limits

Cathode heating voltage, V 2 2,65 ...
The highest negative supply voltage of the built-in microcircuit, V -38
The greatest negative voltage between the cathode and the common wire, V -30
The highest negative voltage at control inputs 1 and 2, V -14

A typical functional diagram for turning on the IVLSHU1-11/2 indicator is shown in fig. 3. Low voltage source G1 supplies the cathode glow. The anode-grid circuits of the indicator are powered by a voltage source G3. The clock generator G2 controls the operation of the electronic switches S1 and S2 and the logic elements of the microcircuit built into the indicator.

Vacuum luminescent indicator IVLSHU1-11/2

Designation of the inputs of the AF device: I_can.sr.and II_{can. Wed}- signal inputs of the average values of the right and left stereo channels; I_can.peakand II_can.peak- signal inputs of the peak values of the right and left stereo channels.

It is recommended to fix the indicators in the equipment by gluing the cylinder to the edges of the cutout in the false panel under the dimensions of the display with Elastosil glue. Mechanical fastening or fastening on pins soldered on the board is not allowed. Any position of the indicator during operation.

Author: L. Lomakin, Moscow

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