CN201226202Y

CN201226202Y - Control circuit based on singlechip for simulating noise

Info

Publication number: CN201226202Y
Application number: CN 200820108857
Authority: CN
Inventors: 张念鲁; 杨春兰
Original assignee: College of Biochemical Engineering of Beijing Union University
Current assignee: College of Biochemical Engineering of Beijing Union University
Priority date: 2008-06-27
Filing date: 2008-06-27
Publication date: 2009-04-22
Anticipated expiration: 2018-06-27

Abstract

The utility model relates to a sound simulation control circuit based on a singlechip, which can be used by the students of the electronics major in colleges and universities to simulate experiment environments and which belongs to the field of instruments and meters. The control circuit comprises a singlechip, a display circuit, a keyboard circuit, digital regulation resistances and an oscillation circuit. The singlechip is connected with the display circuit, the keyboard circuit and the digital regulation resistances. The sliding ends of the digital regulation resistances are connected with the 555 timer oscillation circuit which is connected with the singlechip and a speaker. The variable resistors of the digital regulation resistances are connected with the appropriate positions in the 555 timer oscillation circuit in order to regulate the oscillation frequency of the 555 timer oscillation circuit, and the positions of the sliding ends of the digital regulation resistances under the control of the singlechip can be changed at any time or according to a certain regularity, as a result, the oscillation frequency of the 555 timer oscillation circuit can be changed at any time or according to a certain regularity, and manually regulated regulation resistances cannot do so.

Description

SCM Based simulation sound control circuit

Technical field

A kind of SCM Based simulation sound control circuit can be used for the simulation of the student of electric class specialty in the colleges and universities to experimental situation, belongs to instrument field.

Background technology

The various oscillatory circuits of being made up of 555 timers are widely used, because it is the medium scale integration (MSI) that a kind of digital circuit combines with mimic channel, so also adopt it to tell about and use in each big universities and colleges electronic technology class teaching material, theory teaching and the practical teaching for example more.At present, in the student of colleges and universities' electricity class specialty, the frequency of the various oscillatory circuits that 555 timers are formed all realizes by the manual adjustments resistance potentiometer, but because the manual adjustments error is bigger, the oscillation frequency of 555 timer oscillatory circuits can not be changed according to predefined rule, have very big drawback.

The utility model content

The purpose of this utility model is to have obeyed the above-mentioned defective of existing sound control circuit, and a kind of SCM Based simulation sound control circuit is provided.This control circuit utilizes the position of Single-chip Controlling digital regulation resistance sliding end, provides different resistance values as the oscillatory circuit of being made up of 555 timers, thereby reaches the oscillation frequency that changes oscillatory circuit.

For achieving the above object, the utility model has been taked following technical scheme.This control circuit comprises single-chip microcomputer, display circuit, keyboard circuit, digital regulation resistance, oscillatory circuit.Single-chip microcomputer connects display circuit, keyboard circuit and digital regulation resistance.The sliding end of digital regulation resistance connects 555 timer oscillatory circuits, and 555 timer oscillatory circuits connect single-chip microcomputer and loudspeaker.

Digital regulation resistance connects in the 555 timer oscillatory circuits, and the variable resistor of digital regulation resistance is connected to appropriate position in the 555 timer oscillatory circuits, the oscillation frequency that is used to regulate 555 timer oscillatory circuits.

The utility model is connected to appropriate position in the 555 timer oscillatory circuits with the variable resistor of digital regulation resistance, be used to regulate the oscillation frequency of 555 timer oscillatory circuits, its advantage is that the position of digital regulation resistance sliding end can change at any time under the control of single-chip microcomputer, also can change by certain rule, the oscillation frequency of such 555 timer oscillatory circuits just can change at any time or change by certain rule, and this is that the manual adjustments potentiometer is difficult to accomplish.

Description of drawings

Fig. 1 circuit block diagram of the present utility model

Fig. 2 circuit theory diagrams of the present utility model

Embodiment

Be elaborated below in conjunction with 1～2 pair of the utility model of accompanying drawing.

Simulation sound control circuit block diagram is simulated sound control circuit figure as shown in Figure 2 as shown in Figure 1.In Fig. 1, single-chip microcomputer passes through I ²C interface and digital regulation resistance chip (including a plurality of digital regulation resistances) carry out exchanges data, adjust a plurality of sliding ends of digital regulation resistance chip with this, obtain a plurality of variable resistors, these variable resistors are connected to appropriate position in the 555 timer oscillatory circuits, reach the effect of the oscillation frequency that changes oscillatory circuit, the loudspeaker of 555 timer oscillatory circuits by connecting, converting different oscillation frequency to sound sends, single-chip microcomputer by and 555 timer oscillatory circuits between connecting line constantly detect the each point oscillation frequency of 555 timer oscillatory circuits, and can show by the display circuit of its connection; The keyboard circuit that single-chip microcomputer connects is used to import various regulating commands, also can show by display circuit.

Concrete connecting circuit as shown in Figure 2.Single-chip microcomputer adopts the 89C52 of MCS-51 series, and the digital regulation resistance chip adopts the X9241U (including 4 digital regulation resistances) of U.S. XICOR company, and 555 timer chips adopt two, and 8 Ω loudspeakers adopt 1, and resistance capacitance is some; What display circuit in the present embodiment and keyboard circuit all adopted is custom circuit

In Fig. 2,89C52 is connected with 9 pin with 14 pin of X9241U respectively with P13 (4 pin) pin by P12 (3 pin), carries out exchanges data; 2 pin of X9241U are connected with 6 pin with 7 pin of 555-1 respectively with 1 pin, and 7 pin of X9241U are connected with 6 pin with 7 pin of 555-2 respectively with 6 pin, for 555 timers provide variable resistor; The P10 of 89C52 (1 pin) is connected 3 pin of 555-1 and 3 pin of 555-2 respectively with P11 (2 pin), is used to monitor the frequency change of 555 timers; Other pin of X9241U all belongs to conventional connection; Other pin of 555-1 and 555-2 also all belongs to conventional connection.

X9241U provides different resistance values to 555-1 and 555-2, and 3 pin of 555-1 and 555-2 can be exported different frequency (being square wave), and the different frequency of 3 pin output of 555-2 can reflect in loudspeaker.The oscillatory circuit that 555-1,555-2 and resistance capacitance are formed belongs to conventional connection, all can find in a lot of data.

Claims

1, SCM Based simulation sound control circuit, it is characterized in that: comprise single-chip microcomputer and the display circuit that is connected with single-chip microcomputer, keyboard circuit, digital regulation resistance and 555 timer oscillatory circuits, the sliding end of digital regulation resistance is connected with 555 timer oscillatory circuits, and 555 timer oscillatory circuits are connected with loudspeaker.