SU1658206A1 - Device for indication of recording level - Google Patents

Description

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(21) 4717195/10 O95682)

(22) 07/11/89

(46) 06.23.91. Bul № 23 (72) A.V. Rybalko

(53) 681.532 (088.8)

(56) Japanese Patent And 47-48848, cl. G 11 In 5/02, published. 1972.

German Patent N 2624473, cl. P 11 In 5/02, published. 1978

(54) DEVICE FOR INDICATING THE RECORD LEVEL

(57) The invention relates to a measurement technique and is intended for use in electronic equipment and control systems. The aim of the invention is to increase the reliability of control and improve ease of use. The device contains a signal source 1, a coupling capacitor 2, a detector 3 on diodes 4.5, transistors 6.10, resistors 7-9, 12-16, comparator 11, electronic switch 17, LED 18, capacitor 19 and dial gauge 20.

The invention relates to a measurement technique and is intended for use in electronic equipment and control systems.

The aim of the invention is to improve the reliability of the display and ease of use.

The drawing shows a schematic diagram of the device.

The recording level indicator contains a signal source 1, a coupling capacitor 2, a detector 3 on diodes 4.5, the first transistor 6, the first, fifth and sixth resistors 7.8.9, the second transistor Yu, the comparator 11, resistors 12–16 , electronic key 17, LED 18, capacitor 19 and dial gauge 20.

The signal source 1 is connected via an isolating capacitor 2 and a diode detector 3 to the base of transistor 6, the emitter of transistor 6 is connected to an indicator through series-connected resistors 7,12, 14,15, and through resistors 7,8,9 to common busbar base

the transistor 10 is connected to the connection point of the resistors 8.9, and the collector of the transistors 6, 10 is connected to the power bus. The first comparator 11 is connected to the connection point of resistors 12.14, the second input to the pin of the reference source, and the output to the control inputs of both keys, the first inputs of which are connected to the connection point of the resistors 12.14 and the LED cathode 18, the anode of which is connected via resistor 16 to the bus + power supply, and the second outputs of the keys are connected to the common bus. The emitter of the transistor 10 is connected via a resistor 13 to the connection point of the first terminal of the capacitor 19 and the resistors 14, 15. The second terminal of the capacitor 19 is connected to a common bus with

The device works as follows.

The base of the transistor 6 from the source 1 signal through the coupling capacitor 2 and the diode detector 3 on

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In diodes 4.5, the control signal voltage is applied (hereinafter the signal). From the resistors 8, 9 the divider voltage of the signal goes through the resistors 12 14, 15 to the dial indicator 20, and from resistor 9 to the base of the transistor 10; from the emitter of this transistor through resistors 13,15 - to dial gauge 20.

When the signal level reaches the value, when the arrow of the indicator 20 deviates by 40% of the scale, the comparator 11 is activated and closes the keys 17. At the same time, the signal at the input of the resistor 14 closes on the common bus and does not pass through the resistor 14. At the same time, an overload LED 18 lights up (the signal level is too high). At this time, the operation of the arrow indicator is controlled by a signal input through the transistor 10 and the limiting resistors 13,15. Resistor 13 is selected so that, at the highest possible signal level, the switch indicator 20 does not overshoot the arrow indicator 20. Resistor 14 prevents the measuring mechanism of dial indicator 20 from returning through the closed key 17. When the signal level decreases, the circuit returns to its original state.

Thus, the device is distinguished by increased reliability of control due to the use of two signal paths with the same constant time. The first path includes a transistor 6, resistors 7, 12, 14, a comparator 11, a key 17. The second path includes resistors 8.9, 13, a transistor 10. A capacitor 19, a resistor 15 characterizing the time constant, and an indicator 20 is common to both paths.

The presence of the diode 18 indication of the overload mode facilitates the setting of the optimum recording level.

Claims (1)

Invention formula) A device for indicating the level of an e-record, containing a capacitor, a signal source connected through a split capacitor and a diode detector to the base of the first transistor, the emitter of which through the first, second, third and fourth resistors and indicator connected in series, as well as through the first connected in series, The fifth and sixth resistors are connected to the common bus, the base of the second transistor is connected to the junction point of the fifth and sixth resistors, and the collectors of both transistors are connected to the bus + power, I distinguish In order to improve the reliability of the display and ease of operation, two keys, an LED, a seventh and eighth resistors and a comparator are inserted into it, one input connected to the connection point of the third and fourth resistors, the other input to the reference source bus, and output - to the control inputs of two keys, the first inputs of which are connected respectively to the connection point of the second and third resistors and to the cathodes of the LED, the anode of which is connected via the seventh resistor to the bus + power, the second inputs - to the common w hydrochloric, and an emitter of the second transistor through a eighth resistor connected to the other terminal of the capacitor and to the junction of the third and fourth resistors. /five