音樂頻譜電路原理圖與源程序分享

ID:117827 · 發(fā)表于 2016-5-1 16:04

一個(gè)學(xué)習(xí)單片機(jī)的程序及電路
原理圖上畫的是16 x 8的，實(shí)物是16 x 12的，另外加的4行LED分別由由P1.6、P1.7、P5.4和P5.5控制。

完整的資料下載：

音樂頻譜.zip (476.95 KB, 下載次數(shù): 282)

音樂頻譜電路圖：

音樂頻譜源程序：

/*-----------------------------------------------------------------------*/
/* 單片機(jī)音樂頻譜 */
/* 系統(tǒng)時(shí)鐘33MHz */
/*-----------------------------------------------------------------------*/
/*-----------------------------宏定義-----------------------------------*/
#include<stc15f2k60s2.h> //stc15系列1T單片機(jī)
#define ADC_CHANNEL 0x01 //AD轉(zhuǎn)換通道P1.0
#define ADC_POWER 0x80 //ADC電源控制位
#define ADC_SPEED 0x60 //90個(gè)時(shí)鐘周期
#define ADC_START 0x08 //ADC啟動(dòng)控制位
#define ADC_FLAG 0x10 //ADC完成標(biāo)志位
#define SAMPLE_NUM 64 //取64點(diǎn)FFT算法
#define NUM_2_LOG 6 //2的6次方
#define FFT_OUT_MIN 1 //FFT運(yùn)算最小值
#define LED_C1_8 P2 //LED1~8列
#define LED_C9_16 P3 //LED9~16列
#define LED_R1_8 P0 //LED1~8行
/***************************引腳定義*****************************/
sbit LED_R1 = P0^0; //LED1~8行
sbit LED_R2 = P0^1;
sbit LED_R3 = P0^2;
sbit LED_R4 = P0^3;
sbit LED_R5 = P0^4;
sbit LED_R6 = P0^5;
sbit LED_R7 = P0^6;
sbit LED_R8 = P0^7;
sbit LED_R9 = P1^6; //LED第9行
sbit LED_R10 = P1^7; //LED第10行
sbit LED_R11 = P5^4; //LED第11行
sbit LED_R12 = P5^5; //LED第12行
sbit SWITCH = P4^5;
/*----------------------------變量表----------------------------*/
unsigned char code BIT_RESORT[SAMPLE_NUM] = { 0, 32, 16, 48, 8, 40, 24, 56,4, 36, 20, 52, 12, 44, 28, 60, //比特逆序重排
2, 34, 18, 50, 10, 42, 26, 58, 6, 38, 22, 54, 14, 46, 30, 62,
1, 33, 17, 49, 9, 41, 25, 57,5, 37, 21, 53, 13, 45, 29, 61,
3, 35, 19, 51, 11, 43, 27, 59,7, 39, 23, 55, 15, 47, 31, 63};
char code SIN_TAB[SAMPLE_NUM] = { 0 ,12 ,25 ,37 ,49 ,60 ,71 ,81 ,90 ,98 ,106 ,112 ,117 ,122 ,125 ,126 , //正弦表
127 ,126 ,125 ,122 ,117 ,112 ,106 ,98 ,90 ,81 ,71 ,60 ,49 ,37 ,25 ,12 ,
0 ,-12 ,-25 ,-37 ,-49 ,-60 ,-71 ,-81 ,-90 ,-98 ,-106 ,-112 ,-117 ,-122 ,-125 ,-126 ,
-127 ,-126 ,-125 ,-122 ,-117 ,-112 ,-106 ,-98 ,-90 ,-81 ,-71 ,-60 ,-49 ,-37 ,-25 ,-12 };
char code COS_TAB[SAMPLE_NUM] = {127 ,126 ,125 ,122 ,117 ,112 ,106 ,98 ,90 ,81 ,71 ,60 ,49 ,37 ,25 ,12 , //余弦表
0 ,-12 ,-25 ,-37 ,-49 ,-60 ,-71 ,-81 ,-90 ,-98 ,-106 ,-112 ,-117 ,-122 ,-125 ,-126 ,
-127 ,-126 ,-125 ,-122 ,-117 ,-112 ,-106 ,-98 ,-90 ,-81 ,-71 ,-60 ,-49 ,-37 ,-25 ,-12 ,
0 ,12 ,25 ,37 ,49 ,60 ,71 ,81 ,90 ,98 ,106 ,112 ,117 ,122 ,125 ,126 };
unsigned char LED_NUM[] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff}; //led顯示數(shù)目
unsigned char AMP, AMP_TAB[16]; //頻譜幅值，幅值表
unsigned char DISP_NUM; //顯示次數(shù)
unsigned char KEEP, KEEP_NUM; //自動(dòng)增益選擇
int xdata FFT_REAL[SAMPLE_NUM]; //FFT運(yùn)算結(jié)果實(shí)部
int xdata FFT_IMAGE[SAMPLE_NUM]; //FFT運(yùn)算結(jié)果虛部
bit SWITCH_ON;
/**************************************************************
*名稱：delay
*功能：微秒級(jí)延時(shí)
**************************************************************/
void Delay(unsigned int i)
{
while(i--);
}
/**************************************************************
*名稱：Delay_ms
*功能：毫秒級(jí)延時(shí)
**************************************************************/
void Delay_ms(unsigned int x)
{
unsigned int i, j;
for(i = 0; i < x; i++)
for(j = 0; j < 500; j++);
}
/**************************************************************
*名稱：IOInit
*功能：IO端口初始化
**************************************************************/
void IOInit(void)
{
P1M0 = 0x00; //高阻輸入
P1M1 = 0x01;
P1ASF = 0x01; //設(shè)為AD轉(zhuǎn)換
}
/**************************************************************
*名稱：Timer0Init
*功能：定時(shí)器0初始化100us定時(shí)
**************************************************************/
void TimerInit(void) //100微秒@33.000MHz
{
AUXR = 0XC0; //定時(shí)器0-1T，定時(shí)器1-12T
TMOD = 0X00; //定時(shí)器0/1-方式0-16位自動(dòng)重裝
TL0 = 0X16; //定時(shí)器0-定時(shí)170us-顯示幅值
TH0 = 0Xea;
TL1 = 0X1C; //定時(shí)器1-定時(shí)1ms-檢測(cè)開關(guān)狀態(tài)
TH1 = 0XF3;
TR0=1;
TR1 = 1;
}
/**********************************************************
*名稱：Display
*功能：顯示幅值
**********************************************************/
void Display(void)
{
DISP_NUM++;
if(DISP_NUM == 17)
DISP_NUM = 1;
LED_R1_8 = 0X00; LED_R9 = 0; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0; //顯示前先關(guān)閉
switch(DISP_NUM) //逐列顯示
{
case 1: AMP = AMP_TAB[0]; LED_C1_8 = 0X01; LED_C9_16 = 0x00; break;
case 2: AMP = AMP_TAB[1]; LED_C1_8 = 0X02; LED_C9_16 = 0x00; break;
case 3: AMP = AMP_TAB[2]; LED_C1_8 = 0X04; LED_C9_16 = 0x00; break;
case 4: AMP = AMP_TAB[3]; LED_C1_8 = 0X08; LED_C9_16 = 0x00; break;
case 5: AMP = AMP_TAB[4]; LED_C1_8 = 0X10; LED_C9_16 = 0x00; break;
case 6: AMP = AMP_TAB[5]; LED_C1_8 = 0X20; LED_C9_16 = 0x00; break;
case 7: AMP = AMP_TAB[6]; LED_C1_8 = 0X40; LED_C9_16 = 0x00; break;
case 8: AMP = AMP_TAB[7]; LED_C1_8 = 0X80; LED_C9_16 = 0x00; break;
case 9: AMP = AMP_TAB[8]; LED_C1_8 = 0X00; LED_C9_16 = 0x01; break;
case 10: AMP = AMP_TAB[9]; LED_C1_8 = 0X00; LED_C9_16 = 0x02; break;
case 11: AMP = AMP_TAB[10]; LED_C1_8 = 0X00; LED_C9_16 = 0x04; break;
case 12: AMP = AMP_TAB[11]; LED_C1_8 = 0X00; LED_C9_16 = 0x08; break;
case 13: AMP = AMP_TAB[12]; LED_C1_8 = 0X00; LED_C9_16 = 0x10; break;
case 14: AMP = AMP_TAB[13]; LED_C1_8 = 0X00; LED_C9_16 = 0x20; break;
case 15: AMP = AMP_TAB[14]; LED_C1_8 = 0X00; LED_C9_16 = 0x40; break;
case 16: AMP = AMP_TAB[15]; LED_C1_8 = 0X00; LED_C9_16 = 0x80; break;
}
if(AMP <= 8)
{
LED_R1_8 = LED_NUM[AMP];
LED_R9 = 0;
LED_R10 = 0;
LED_R11 = 0;
LED_R12 = 0;
}
if(AMP == 9)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 0;
LED_R11 = 0;
LED_R12 = 0;
}
if(AMP == 10)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 1;
LED_R11 = 0;
LED_R12 = 0;
}
if(AMP == 11)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 1;
LED_R11 = 1;
LED_R12 = 0;
}
if(AMP == 12)
{
LED_R1_8 = 0XFF;
LED_R9 = 1;
LED_R10 = 1;
LED_R11 = 1;
LED_R12 = 1;
}
// unsigned char i;
// LED_C1_8 = 0X01; LED_C9_16 = 0X00;
// for(i = 0; i < 8; i++)
// {
// if(LED_NUM[AMP_TAB[i]] <= 8)
// {
// LED_R1_8 = LED_NUM[AMP_TAB[i]];
// LED_R9 = 0; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 9)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 10)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 1; LED_R11 = 0; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 11)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 1; LED_R11 = 1; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 12)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 1; LED_R11 = 1; LED_R12 = 1;
// }
// Delay(2000);
// LED_C1_8 <<= 1;
// }
// LED_C1_8 = 0X00; LED_C9_16 = 0X01;
// for(i = 0; i < 8; i++)
// {
// if(LED_NUM[AMP_TAB[i]] <= 8)
// {
// LED_R1_8 = LED_NUM[AMP_TAB[i]];
// LED_R9 = 0; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 9)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 10)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 1; LED_R11 = 0; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 11)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 1; LED_R11 = 1; LED_R12 = 0;
// }
// if(LED_NUM[AMP_TAB[i]] == 12)
// {
// LED_R1_8 = 0XFF;
// LED_R9 = 1; LED_R10 = 1; LED_R11 = 1; LED_R12 = 1;
// }
// Delay(2000);
// LED_C9_16 <<= 1;
// }
}
/************************************************
*名稱：ReadADC
*功能：讀取AD轉(zhuǎn)換結(jié)果
************************************************/
unsigned char ReadADC(void)
{
ADC_CONTR = ADC_POWER + ADC_START; //啟動(dòng)轉(zhuǎn)換
Delay(50);
while(!(ADC_CONTR & ADC_FLAG)); //等待轉(zhuǎn)換結(jié)束
ADC_CONTR = ADC_POWER;
return (ADC_RES << 2 + ADC_RESL);
}
/************************************************
*名稱：sqrt
*功能：算平方根
************************************************/
short sqrt( unsigned long M) //不懂啊
{
unsigned int N, i;
unsigned long tmp, ttp;
if( M == 0 )
return 0;
N = 0;
tmp = ( M >> 30 );
M <<= 2;
if( tmp > 1 )
{
N ++;
tmp -= N;
}
for( i=15; i>0; i-- )
{
N <<= 1;
tmp <<= 2;
tmp += (M >> 30);
ttp = N;
ttp = (ttp<<1)+1;
M <<= 2;
if( tmp >= ttp )
{
tmp -= ttp;
N ++;
}
}
return N;
}
/************************************************
*名稱：FFT
*功能：快速傅里葉變換求取頻譜
************************************************/
void FFT(void) //基2時(shí)分蝶式算法
{
// unsigned char i, j, r, m1, m2, m3, m4, k1, k2; //分別為：級(jí)號(hào)，蝶群號(hào)，運(yùn)算蝶號(hào)，蝶群總數(shù)，蝶群長度，運(yùn)算蝶數(shù)，蝶群址，蝶址
// unsigned char p;
// unsigned char MAX = 0;
// short u, v;
// unsigned long ulReal, ulImage;
register unsigned char i,bb,j,k,p,MAX;
register short TR,TI,temp;
unsigned long ulReal;
unsigned long ulImage;
for(i = 0; i < SAMPLE_NUM; i++) //采樣
{
FFT_REAL[BIT_RESORT[i]] = ReadADC() << KEEP;
FFT_IMAGE[i] = 0;
}
KEEP_NUM = FFT_REAL[2] >> 4;
if((7 < KEEP_NUM) && (KEEP_NUM <= 8))
KEEP = 1;
else if((4 < KEEP_NUM) && (KEEP_NUM <= 6))
KEEP = 2;
else if((2 < KEEP_NUM) && (KEEP_NUM <= 4))
KEEP = 3;
else
KEEP = 5;
for( i=1; i<=NUM_2_LOG; i++)
{
bb=1;
bb <<= (i-1);
for( j=0; j<=bb-1; j++)
{
p=1;
p <<= (NUM_2_LOG-i);
p = p*j;
for( k=j; k<SAMPLE_NUM; k=k+2*bb)
{
TR = FFT_REAL[k]; TI = FFT_IMAGE[k]; temp = FFT_REAL[k+bb];
FFT_REAL[k] = FFT_REAL[k] + ((FFT_REAL[k+bb]*COS_TAB[p])>>7) + ((FFT_IMAGE[k+bb]*SIN_TAB[p])>>7);
FFT_IMAGE[k] = FFT_IMAGE[k] - ((FFT_REAL[k+bb]*SIN_TAB[p])>>7) + ((FFT_IMAGE[k+bb]*COS_TAB[p])>>7);
FFT_REAL[k+bb] = TR - ((FFT_REAL[k+bb]*COS_TAB[p])>>7) - ((FFT_IMAGE[k+bb]*SIN_TAB[p])>>7);
FFT_IMAGE[k+bb] = TI + ((temp*SIN_TAB[p])>>7) - ((FFT_IMAGE[k+bb]*COS_TAB[p])>>7);
FFT_REAL[k] >>= 1;
FFT_IMAGE[k] >>= 1;
FFT_REAL[k+bb] >>= 1;
FFT_IMAGE[k+bb] >>= 1;
}
}
}
// for(i = 1; i <= NUM_2_LOG; i++)
// {
// m1 = 1 << (i - 1);
// m2 = m1 << 1;
// m3 = 1 << (NUM_2_LOG - i);
// for(j = 0; j < m3; j++)
// {
// m4 = j * m2;
// for(r = 0; r < m1; r++)
// {
// p = r * m3;
// k1 = m4 + r;
// k2 = k1 + m1;
// u = (FFT_REAL[k2] * COS_TAB[p]) >> 7 + (FFT_IMAGE[k2] * SIN_TAB[p]) >> 7;
// v = (FFT_IMAGE[k2] * COS_TAB[p]) >> 7 + (FFT_REAL[k2] * SIN_TAB[p]) >> 7;
// FFT_REAL[k2] = FFT_REAL[k1] - u;
// FFT_IMAGE[k2] = FFT_IMAGE[k1] - v;
// FFT_REAL[k1] = FFT_REAL[k1] + u;
// FFT_IMAGE[k1] = FFT_IMAGE[k1] + v;
// FFT_REAL[k1] >>= 1;
// FFT_IMAGE[k1] >>= 1;
// FFT_REAL[k2] >>= 1;
// FFT_IMAGE[k2] >>= 1;
// }
// }
// }
for(i = 0; i < 16; i++)
{
ulReal = FFT_REAL[i + 1];
ulReal *= ulReal;
ulImage = FFT_IMAGE[i + 1];
ulImage *= ulImage;
AMP_TAB[i] = sqrt(ulImage + ulReal);
if(AMP_TAB[i] < FFT_OUT_MIN)
AMP_TAB[i] = 0;
else
AMP_TAB[i] -= FFT_OUT_MIN;
if(AMP_TAB[i] > MAX)
MAX = AMP_TAB[i];
}
if(MAX > 12)
{
MAX /= 12;
for(i = 0; i < 16; i++)
AMP_TAB[i] /= MAX;
}
}
/**********************************************************
*名稱：Display_zzz
*功能；顯示動(dòng)畫
**********************************************************/
void Display_zzz(void)
{
//逐行掃描-4幀
unsigned char code TAB_LED[4][24] = {{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x07, 0x00, 0x02, 0x00, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x07, 0x00, 0x02, 0x00, 0x07, 0x00, 0xe0, 0x01, 0x40, 0x00, 0x80, 0x00, 0xe0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
{0x07, 0x00, 0x02, 0x00, 0x07, 0x00, 0xe0, 0x01, 0x40, 0x00, 0x80, 0x00, 0xe0, 0x01, 0x00, 0xf8, 0x00, 0x10, 0x00, 0x20, 0x00, 0x40, 0x00, 0xf8}};
unsigned char i, j;
P0 = 0x00; LED_R9 = 0; LED_R10 = 0; LED_R11 = 0; LED_R12 = 0;
for(i = 0; i < 4; i++)
{
for(j = 0; j < 100; j++)
{
LED_C1_8 = TAB_LED[i][2 * 0];
LED_C9_16 = TAB_LED[i][2 * 0 + 1];
LED_R1 = 1;
Delay_ms(2);
LED_R1 = 0;
LED_C1_8 = TAB_LED[i][2 * 1];
LED_C9_16 = TAB_LED[i][2 * 1 + 1];
LED_R2 = 1;
Delay_ms(2);
LED_R2 = 0;
LED_C1_8 = TAB_LED[i][2 * 2];
LED_C9_16 = TAB_LED[i][2 * 2 + 1];
LED_R3 = 1;
Delay_ms(2);
LED_R3 = 0;
LED_C1_8 = TAB_LED[i][2 * 3];
LED_C9_16 = TAB_LED[i][2 * 3 + 1];
LED_R4= 1;
Delay_ms(2);
LED_R4 = 0;
LED_C1_8 = TAB_LED[i][2 * 4];
LED_C9_16 = TAB_LED[i][2 * 4 + 1];
LED_R5 = 1;
Delay_ms(2);
LED_R5 = 0;
LED_C1_8 = TAB_LED[i][2 * 5];
LED_C9_16 = TAB_LED[i][2 * 5 + 1];
LED_R6 = 1;
Delay_ms(2);
LED_R6 = 0;
LED_C1_8 = TAB_LED[i][2 * 6];
LED_C9_16 = TAB_LED[i][2 * 6 + 1];
LED_R7 = 1;
Delay_ms(2);
LED_R7 = 0;
LED_C1_8 = TAB_LED[i][2 * 7];
LED_C9_16 = TAB_LED[i][2 * 7 + 1];
LED_R8 = 1;
Delay_ms(2);
LED_R8 = 0;
LED_C1_8 = TAB_LED[i][8 * 2];
LED_C9_16 = TAB_LED[i][8 * 2 + 1];
LED_R9 = 1;
Delay_ms(2);
LED_R9 = 0;
LED_C1_8 = TAB_LED[i][9 * 2];
LED_C9_16 = TAB_LED[i][9 *2 + 1];
LED_R10 = 1;
Delay_ms(2);
LED_R10 = 0;
LED_C1_8 = TAB_LED[i][10 *2];
LED_C9_16 = TAB_LED[i][10 * 2 + 1];
LED_R11 = 1;
Delay_ms(2);
LED_R11 = 0;
LED_C1_8 = TAB_LED[i][11 * 2];
LED_C9_16 = TAB_LED[i][11 * 2 + 1];
LED_R12 = 1;
Delay_ms(2);
LED_R12 = 0;
}
}
}
/************************************************
*名稱：main
*功能：主函數(shù)
************************************************/
void main()
{
IOInit(); //初始化
TimerInit();
DISP_NUM = 0;
KEEP = 0;
KEEP_NUM = 0;
EA = 1; //開中斷
ET1 = 1;
while(1)
{
if(SWITCH_ON == 0)
{
ET0 = 0;
Display_zzz();
}
if(SWITCH_ON == 1)
{
ET0 = 1;
FFT();
}
}
}
/************************************************
*名稱：Timer0Interrupt
*功能：定時(shí)器0中斷服務(wù)程序-顯示
************************************************/
void Timer0Interrupt() interrupt 1
{
Display();
Delay(300);
}
/************************************************
*名稱：Timer1Interrupt
*功能：定時(shí)器1中斷服務(wù)程序-檢測(cè)開關(guān)狀態(tài)
************************************************/
void Timer1Interrupt() interrupt 3
{
if(SWITCH == 1)
SWITCH_ON = 1;
if(SWITCH == 0)
SWITCH_ON = 0;
}

復(fù)制代碼

ID:108508 · 發(fā)表于 2016-5-7 10:06

下載保留學(xué)習(xí)

ID:84948 · 發(fā)表于 2016-5-14 14:14

多謝樓主的分享！~~

ID:61840 · 發(fā)表于 2016-6-15 23:19

不錯(cuò)的程序，學(xué)習(xí)學(xué)習(xí)

ID:136460 · 發(fā)表于 2016-9-1 05:36

好人，天下好人多

ID:138343 · 發(fā)表于 2016-9-17 07:22

感謝樓主分享，最近在想關(guān)于頻譜的顯示問題，如同一行，假如第一列的不顯示，而第二列的顯示，在同一時(shí)間里這個(gè)問題怎么處理

ID:42417 · 發(fā)表于 2016-9-25 00:33

好東西，多謝樓主的分享！~~

ID:100826 · 發(fā)表于 2016-9-25 07:35

多謝樓主的分享！

ID:148612 · 發(fā)表于 2016-11-18 11:15

謝謝樓主分享

ID:33848 · 發(fā)表于 2017-6-1 09:02

看上去似乎不錯(cuò)

ID:220055 · 發(fā)表于 2017-9-5 23:38

看上去似乎不錯(cuò)

ID:14237 · 發(fā)表于 2017-9-6 08:54

多謝樓主的分享！

ID:239055 · 發(fā)表于 2017-11-9 07:56

我又來了，謝謝樓主

ID:127160 · 發(fā)表于 2017-11-15 14:05

謝謝分享。

ID:229527 · 發(fā)表于 2017-11-23 10:53

謝謝樓主！

ID:128101 · 發(fā)表于 2018-8-1 21:07

感謝分享

ID:128101 · 發(fā)表于 2018-10-9 21:44

感謝分享學(xué)習(xí)學(xué)習(xí)

ID:73030 · 發(fā)表于 2019-1-20 17:42

感謝樓主分享。

ID:524014 · 發(fā)表于 2019-6-11 18:42

下載保存，學(xué)習(xí)

ID:578423 · 發(fā)表于 2020-5-16 12:21

先頂再看，好東西

ID:53667 · 發(fā)表于 2020-5-22 06:08

謝謝分享，收下了慢慢研究

ID:78387 · 發(fā)表于 2020-6-2 00:30

謝謝樓主分享！學(xué)習(xí)了

ID:653833 · 發(fā)表于 2020-10-24 20:12

我想知道三極管的作用，，，

ID:833128 · 發(fā)表于 2020-12-11 08:45

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