20-grade level indication circuit with multiple input sources

Abstract

The present invention discloses a 20-grade level indication circuit with multiple input sources. The 20-grade level indication circuit with multiple input sources comprises a level signal generation circuit, a 10-grade 0-2.5V level indication circuit, and a 10-grade 2.5-3.5V level indication circuit. Two linear point / cylindrical 10-grade LED display drivers LM3914 are cascaded to form a 20-grade level indication circuit. The 20-grade level indication circuit employs three kinds of signal generation circuits which are a touch delay switching circuit, a manual voltage regulation circuit, and a self excited oscillation circuit as level input sources of the level indication circuit and changing of level in the operation of the circuits is visually presented by employing a subsequent level indication circuit so that the height of LED columns or two LED points can directly reflect the level of input signals, circuit working processes can be vividly displayed, measurement comparison analysisof the three signal generation circuits can be performed and circuit selection application can be effectively performed; and the circuit is small in size and stable in operation; and short-circuit caps are arranged to conveniently detect a current in the circuit.

Description

Technical field: [0001] The invention belongs to the technical field of level indicating circuits, in particular to a 20-stage level indicating circuit with multiple input sources. Background technique: [0002] The level indicator circuit indicates the level by the number of bright spots or the level. There are two main types of existing level indicator circuits, one of which is built with discrete components, mainly for the application of diodes and triodes. Such as figure 1 As shown, when Ui>0.6V~0.7V, VT1 turns from off to on, and LED1 lights up. After that, every time Ui increases by about 0.7V, one subsequent LED will be turned on, so as to visually display the signal. , the circuit is relatively large in size and relatively basic in technology; the other is a level indicating circuit built with an ASIC chip, such as figure 2 As shown, the 4-level level indication circuit built by the integrated chip D1405, the D1405 level indication drive integrated circuit uses 5 ...

AI Technical Summary

Problems solved by technology

[0003] For this reason, the technical problem to be solved by the present invention is that the level indication circuit in the prior art has a large volume, a single input source, and cannot be compared and analyzed, and a suitable circuit cannot be selected as required, thereby proposing a 20-level multi-input source level indication circuit

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