电工电子爱好者园地

DDD888 · 发表于 19-2-2018 10:34:47

DDD888 发表于 18-2-2018 08:51
我想实现机械开关不焊接在电路板pcb上,这样如果键盘机械开关坏了，我只要将坏的拿掉，插上好的就行了,我想 ...

这个是原理图
https://github.com/ErgoDox-EZ/do ... 0EZ%20Schematic.pdf

DDD888 · 发表于 13-3-2018 05:52:59

根据我另一半的结论，我没有自己做，我网上订购了个现成的,就这个https://ergodox-ez.com/，先买一部分，花了nzd370

DDD888 · 发表于 19-3-2018 09:25:25

我给我的很热的无线路由器加的电风扇

DDD888 · 发表于 20-3-2018 06:00:29

内部的连接

gzhjb · 发表于 24-3-2018 20:18:15

这个可能是澳洲本地最好的一个电子电工爱好帖。

DDD888 · 发表于 4-4-2018 19:10:59

我买了rigol 1054z

https://s.taobao.com/search?q=ri ... d=tbindexz_20170306

打算拿到手后就升级到带宽100兆

QWERTYASDFG · 发表于 5-4-2018 10:44:34

DDD888 发表于 4-4-2018 19:10
我买了rigol 1054z

https://s.taobao.com/search?q=rigol+1054z&imgfile=&commend=all&ssid=s5-e&search ...

没明白，100MHZ的示波器可以测试什么？和带宽100mbps有什么关系？

DDD888 · 发表于 5-4-2018 12:19:59

QWERTYASDFG 发表于 5-4-2018 10:44
没明白，100MHZ的示波器可以测试什么？和带宽100mbps有什么关系？

我只知道越大越好啦

QWERTYASDFG · 发表于 5-4-2018 13:23:20

DDD888 发表于 5-4-2018 12:19
我只知道越大越好啦

哦，我以为之间有什么特别的关系。示波器可测试的频率范围也不是越大越好，我理解测试高频的方法只是设备里通过降频，把高频信号转换成低频来测试的。如果直接测试高频信号，线路板之间的屏蔽隔离是比较麻烦的技术问题。打个比方说，如果买个车上下班用的话，为了追求速度去买个火箭，不一定更好用。

DDD888 · 发表于 16-4-2018 16:16:38

我的显微镜

QWERTYASDFG · 发表于 17-4-2018 14:08:43

DDD888 发表于 16-4-2018 16:16
我的显微镜

光学还是电子的？如果光学的倍数太大，视角就会太小，而且变形也比较厉害。用来观察还行，用来操作因为焦距太短，无法在镜片和零件之间放入任何设备。感觉单片镜的放大倍率在5-10倍左右的还不错。再高就不太好用了。多片镜的因为需要减少畸变情况，会选用较小的镜片，而损失较多的光通量，也不方便观察和操作。电子的虽然没有这个问题，但要想获得比较高的放大倍数，需要高清晰度的感光芯片。否则放大以后图像清晰度不够。高清芯片非常不便宜。

DDD888 · 发表于 17-4-2018 19:04:32

本帖最后由 DDD888 于 17-4-2018 19:13 编辑

QWERTYASDFG 发表于 17-4-2018 14:08
光学还是电子的？如果光学的倍数太大，视角就会太小，而且变形也比较厉害。用来观察还行，用来操作因为焦 ...

raspberrypi 3 + https://www.ebay.com/itm/Raspber ... 2060353.m2749.l2649

镜头和观察物的距离有六厘米左右，应该算还可以

DDD888 · 发表于 17-4-2018 19:05:22

我的示波器

DDD888 · 发表于 18-4-2018 11:35:57

今天，我用了下新买的示波器，非常好用

lummar · 发表于 18-4-2018 22:46:09

中国产的东西，质量堪忧啊。连续两次中招，都是虚焊，我擦

DDD888 · 发表于 19-4-2018 07:36:07

本帖最后由 DDD888 于 19-4-2018 07:39 编辑

lummar 发表于 18-4-2018 22:46
中国产的东西，质量堪忧啊。连续两次中招，都是虚焊，我擦

但不是中国产的示波器价格太贵啦,另外你也不知道标的是美国公司的牌子，产地可能就是中国

https://www.tek.com/oscilloscope ... torage-oscilloscope

lummar · 发表于 19-4-2018 20:06:12

DDD888 发表于 19-4-2018 07:36
但不是中国产的示波器价格太贵啦,另外你也不知道标的是美国公司的牌子，产地可能就是中国

https://w ...

是的。现在貌似什么都脱离不了中国。中国的东西价格还算可以，勉强够用，不过如果要是人工焊接，质量就参差不齐。我说的两个虚焊都是温度过高，焊锡发白。一看都是不合格的焊点。不过奇怪的是居然还支撑了好几年。如果没有虚焊，寿命会是几何？

lummar · 发表于 19-4-2018 20:20:04

DDD888 发表于 26-10-2017 05:43
我买了块可以让我调节输出电压的元件https://www.ebay.com/itm/LTC3780-Automatic-lifting-pressure-Consta ...

刚刚看了下spec，板子本身貌似是带15A保险丝的。你这个看样子是板子有问题

DDD888 · 发表于 20-4-2018 06:43:34

lummar 发表于 19-4-2018 20:20
刚刚看了下spec，板子本身貌似是带15A保险丝的。你这个看样子是板子有问题

高手啊

我买来一接，短路冒烟吓死我，我以为我接线错误，所以没有向卖家要退货，现在是坏的在那空放着

DDD888 · 发表于 20-4-2018 06:50:39

lummar 发表于 19-4-2018 20:06
是的。现在貌似什么都脱离不了中国。中国的东西价格还算可以，勉强够用，不过如果要是人工焊接，质量就参 ...

我买的第一个日本的kenwood的几十年用过的旧的示波器，运到我家的时候，输入信号没有波形，卖家说一切都好，我拆开机器一看，原来是连输入信号的电阻拖开了，所以我焊好后就可以正常使用了，现在和新的示波器一起用，但显然新的数字示波器太好用了

lummar · 发表于 20-4-2018 20:12:25

DDD888 发表于 20-4-2018 06:50
我买的第一个日本的kenwood的几十年用过的旧的示波器，运到我家的时候，输入信号没有波形，卖家说一切都 ...

运输过程中暴力装卸太普遍了

电子设备基本都一样，买新不买旧。新的往往更好更便宜

DDD888 · 发表于 21-4-2018 11:44:57

我用fpga连r2r电阻数字转模拟输出信号在我的示波器上

DDD888 · 发表于 21-4-2018 11:54:14

本帖最后由 DDD888 于 21-4-2018 12:18 编辑

lummar 发表于 20-4-2018 20:12
运输过程中暴力装卸太普遍了
电子设备基本都一样，买新不买旧。新的往往更好更便宜

是的，但小米路由器除外

我原先买了小米的2根天线的觉得挺好，就又买了小米的四根天线的，结果四根天线的用了一年坏了，拆开一看，两根天线的有贴很大的铁片在背后作散热，四根的竟然没有大的散热片，垃圾
-----------------------------------------------------
当初买旧的示波器是感觉旧的便宜，新的算上运费税收太贵了，这次碰巧可以从中国带过来，就买个新的啦

DDD888 · 发表于 21-4-2018 12:12:42

我写的verilog代码

module top (
      input  clk,
      output LED1,
      output LED2,

      output PIO1_02,
      output PIO1_03,
      output PIO1_04,
      output PIO1_05,
      output PIO1_06,
      output PIO1_07
);
      reg data1 = 1'b1;
      reg [32:0] counter;
      reg [5:0] index;
      reg [5:0] result;
      reg state;

      assign LED1 = state;
      assign LED2 = data1;

      assign PIO1_02 = result[0];
      assign PIO1_03 = result[1];
      assign PIO1_04 = result[2];
      assign PIO1_05 = result[3];
      assign PIO1_06 = result[4];
      assign PIO1_07 = result[5];

      assign index[5:0] = counter[16:11];

      assign state = counter[20];

      always @(posedge clk) begin
            counter <= counter + 1;
            case(index)
               0: result <= 32;
               1: result <= 35;
               2: result <= 38;
               3: result <= 41;
               4: result <= 44;
               5: result <= 47;
               6: result <= 50;
               7: result <= 52;
               8: result <= 55;
               9: result <= 57;
               10: result <= 59;
               11: result <= 60;
               12: result <= 62;
               13: result <= 63;
               14: result <= 63;
               15: result <= 63;
               16: result <= 63;
               17: result <= 63;
               18: result <= 63;
               19: result <= 63;
               20: result <= 62;
               21: result <= 60;
               22: result <= 59;
               23: result <= 57;
               24: result <= 55;
               25: result <= 52;
               26: result <= 50;
               27: result <= 47;
               28: result <= 44;
               29: result <= 41;
               30: result <= 38;
               31: result <= 35;
               32: result <= 32;
               33: result <= 29;
               34: result <= 26;
               35: result <= 23;
               36: result <= 20;
               37: result <= 17;
               38: result <= 14;
               39: result <= 12;
               40: result <= 9;
               41: result <= 7;
               42: result <= 5;
               43: result <= 4;
               44: result <= 2;
               45: result <= 1;
               46: result <= 1;
               47: result <= 0;
               48: result <= 0;
               49: result <= 0;
               50: result <= 1;
               51: result <= 1;
               52: result <= 2;
               53: result <= 4;
               54: result <= 5;
               55: result <= 7;
               56: result <= 9;
               57: result <= 12;
               58: result <= 14;
               59: result <= 17;
               60: result <= 20;
               61: result <= 23;
               62: result <= 26;
               63: result <= 29;
            endcase
      end
endmodule

DDD888 · 发表于 21-4-2018 12:14:22

icestick.pcf
set_io --warn-no-port RX 9
set_io --warn-no-port TX 8
set_io LED1 99
set_io LED2 98
set_io LED3 97
set_io LED4 96
set_io LED5 95
set_io clk 21

# # Pmod connector
set_io PIO1_02 78 # Pin 1
set_io PIO1_03 79 # Pin 2
set_io PIO1_04 80 # Pin 3
set_io PIO1_05 81 # Pin 4
set_io PIO1_06 87 # Pin 7
set_io PIO1_07 88 # Pin 8
set_io PIO1_08 90 # Pin 9
set_io PIO1_09 91 # Pin 10

lummar · 发表于 21-4-2018 12:37:07

DDD888 发表于 21-4-2018 11:54
是的，但小米路由器除外

小米。。。
从来不在选项之内。。。
任他雷布斯怎么忽悠，不买就是不买

DDD888 · 发表于 21-4-2018 19:12:10

这是八位的D/A

module top (
input  clk,
output LED1,
output LED2,

output PIO1_02,
output PIO1_03,
output PIO1_04,
output PIO1_05,
output PIO1_06,
output PIO1_07,
output PIO1_08,
output PIO1_09
);
reg data1 = 1'b1;
      reg [32:0] counter;
      reg [7:0] index;
reg [7:0] result;
reg state;

assign LED1 = state;
assign LED2 = data1;

assign PIO1_02 = result[0];
assign PIO1_03 = result[1];
assign PIO1_04 = result[2];
assign PIO1_05 = result[3];
assign PIO1_06 = result[4];
assign PIO1_07 = result[5];
assign PIO1_08 = result[6];
assign PIO1_09 = result[7];

// 47.2khz
assign index[7:0] = counter[7:0];
// 5.87khz
//assign index[7:0] = counter[10:3];

// 23hz
//assign index[7:0] = counter[18:11];

assign state = counter[20];

always @(posedge clk) begin
counter <= counter + 1;

case(index)
               0: result <= 128;
               1: result <= 131;
               2: result <= 134;
               3: result <= 137;
               4: result <= 141;
               5: result <= 144;
               6: result <= 147;
               7: result <= 150;
               8: result <= 153;
               9: result <= 156;
               10: result <= 159;
               11: result <= 162;
               12: result <= 165;
               13: result <= 168;
               14: result <= 171;
               15: result <= 174;
               16: result <= 177;
               17: result <= 180;
               18: result <= 183;
               19: result <= 186;
               20: result <= 188;
               21: result <= 191;
               22: result <= 194;
               23: result <= 196;
               24: result <= 199;
               25: result <= 202;
               26: result <= 204;
               27: result <= 207;
               28: result <= 209;
               29: result <= 212;
               30: result <= 214;
               31: result <= 216;
               32: result <= 219;
               33: result <= 221;
               34: result <= 223;
               35: result <= 225;
               36: result <= 227;
               37: result <= 229;
               38: result <= 231;
               39: result <= 233;
               40: result <= 234;
               41: result <= 236;
               42: result <= 238;
               43: result <= 239;
               44: result <= 241;
               45: result <= 242;
               46: result <= 244;
               47: result <= 245;
               48: result <= 246;
               49: result <= 247;
               50: result <= 249;
               51: result <= 250;
               52: result <= 250;
               53: result <= 251;
               54: result <= 252;
               55: result <= 253;
               56: result <= 254;
               57: result <= 254;
               58: result <= 255;
               59: result <= 255;
               60: result <= 255;
               61: result <= 255;
               62: result <= 255;
               63: result <= 255;
               64: result <= 255;
               65: result <= 255;
               66: result <= 255;
               67: result <= 255;
               68: result <= 255;
               69: result <= 255;
               70: result <= 255;
               71: result <= 254;
               72: result <= 254;
               73: result <= 253;
               74: result <= 252;
               75: result <= 251;
               76: result <= 250;
               77: result <= 250;
               78: result <= 249;
               79: result <= 247;
               80: result <= 246;
               81: result <= 245;
               82: result <= 244;
               83: result <= 242;
               84: result <= 241;
               85: result <= 239;
               86: result <= 238;
               87: result <= 236;
               88: result <= 234;
               89: result <= 233;
               90: result <= 231;
               91: result <= 229;
               92: result <= 227;
               93: result <= 225;
               94: result <= 223;
               95: result <= 221;
               96: result <= 219;
               97: result <= 216;
               98: result <= 214;
               99: result <= 212;
               100: result <= 209;
               101: result <= 207;
               102: result <= 204;
               103: result <= 202;
               104: result <= 199;
               105: result <= 196;
               106: result <= 194;
               107: result <= 191;
               108: result <= 188;
               109: result <= 186;
               110: result <= 183;
               111: result <= 180;
               112: result <= 177;
               113: result <= 174;
               114: result <= 171;
               115: result <= 168;
               116: result <= 165;
               117: result <= 162;
               118: result <= 159;
               119: result <= 156;
               120: result <= 153;
               121: result <= 150;
               122: result <= 147;
               123: result <= 144;
               124: result <= 141;
               125: result <= 137;
               126: result <= 134;
               127: result <= 131;
               128: result <= 128;
               129: result <= 125;
               130: result <= 122;
               131: result <= 119;
               132: result <= 115;
               133: result <= 112;
               134: result <= 109;
               135: result <= 106;
               136: result <= 103;
               137: result <= 100;
               138: result <= 97;
               139: result <= 94;
               140: result <= 91;
               141: result <= 88;
               142: result <= 85;
               143: result <= 82;
               144: result <= 79;
               145: result <= 76;
               146: result <= 73;
               147: result <= 70;
               148: result <= 68;
               149: result <= 65;
               150: result <= 62;
               151: result <= 60;
               152: result <= 57;
               153: result <= 54;
               154: result <= 52;
               155: result <= 49;
               156: result <= 47;
               157: result <= 44;
               158: result <= 42;
               159: result <= 40;
               160: result <= 37;
               161: result <= 35;
               162: result <= 33;
               163: result <= 31;
               164: result <= 29;
               165: result <= 27;
               166: result <= 25;
               167: result <= 23;
               168: result <= 22;
               169: result <= 20;
               170: result <= 18;
               171: result <= 17;
               172: result <= 15;
               173: result <= 14;
               174: result <= 12;
               175: result <= 11;
               176: result <= 10;
               177: result <= 9;
               178: result <= 7;
               179: result <= 6;
               180: result <= 6;
               181: result <= 5;
               182: result <= 4;
               183: result <= 3;
               184: result <= 2;
               185: result <= 2;
               186: result <= 1;
               187: result <= 1;
               188: result <= 1;
               189: result <= 0;
               190: result <= 0;
               191: result <= 0;
               192: result <= 0;
               193: result <= 0;
               194: result <= 0;
               195: result <= 0;
               196: result <= 1;
               197: result <= 1;
               198: result <= 1;
               199: result <= 2;
               200: result <= 2;
               201: result <= 3;
               202: result <= 4;
               203: result <= 5;
               204: result <= 6;
               205: result <= 6;
               206: result <= 7;
               207: result <= 9;
               208: result <= 10;
               209: result <= 11;
               210: result <= 12;
               211: result <= 14;
               212: result <= 15;
               213: result <= 17;
               214: result <= 18;
               215: result <= 20;
               216: result <= 22;
               217: result <= 23;
               218: result <= 25;
               219: result <= 27;
               220: result <= 29;
               221: result <= 31;
               222: result <= 33;
               223: result <= 35;
               224: result <= 37;
               225: result <= 40;
               226: result <= 42;
               227: result <= 44;
               228: result <= 47;
               229: result <= 49;
               230: result <= 52;
               231: result <= 54;
               232: result <= 57;
               233: result <= 60;
               234: result <= 62;
               235: result <= 65;
               236: result <= 68;
               237: result <= 70;
               238: result <= 73;
               239: result <= 76;
               240: result <= 79;
               241: result <= 82;
               242: result <= 85;
               243: result <= 88;
               244: result <= 91;
               245: result <= 94;
               246: result <= 97;
               247: result <= 100;
               248: result <= 103;
               249: result <= 106;
               250: result <= 109;
               251: result <= 112;
               252: result <= 115;
               253: result <= 119;
               254: result <= 122;
               255: result <= 125;
endcase
end
endmodule

DDD888 · 发表于 21-4-2018 19:26:11

感觉用面包板太麻烦了，干脆就将电阻固定下来

DDD888 · 发表于 22-4-2018 10:01:37

我将我新买的主板换到坏的lg电视机上，但开出来的图像是旋转180度，请教大家，这如何解决啊？谢谢

DDD888 · 发表于 22-4-2018 17:51:56

DDD888 发表于 22-4-2018 10:01
我将我新买的主板换到坏的lg电视机上，但开出来的图像是旋转180度，请教大家，这如何解决啊？谢谢:loveline ...

我根据该录像解决了屏幕翻转问题

https://www.youtube.com/watch?v=reUEi6laRnA

https://www.askvg.com/secret-service-codes-for-sony-and-lg-tv/

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