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Description: 7407大电流供应，最大能有30ma，可以驱动电压高达30V，是理想的常用驱动芯片
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Size: 31813 |
Author: 艾吉斯 |
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Description: 7407大电流供应，最大能有30ma，可以驱动电压高达30V，是理想的常用驱动芯片-7407-current supply, the largest to have 30ma, can drive voltage up to 30V, is ideal for common driver IC
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Size: 31744 |
Author: |
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Description: 基于18f4550ICD2、16F877的PIC单片机烧写器仿真器ICD2制作源码
错误更正：877的RA4口要上拉一个5K电阻,R11<4R7,74hc07不行必须用74LS07
如果想重烧IC，4550的CONFIG请参考BMP文件
1。调试时最好有一个有保护的HUB，分步进行
2。焊好后，电位器旋到0，不插队IC，通电测各点电压，并调好12V
3。只插4550，连PC，应能发现新硬件，重点查晶体，USB电压，
4。插好所有IC，连PC，用ICD2的自检功能，能读出三个电压，见CHECK。BMP
5。最后连是连目标板，如果复位电容大于103原装ICD2都不会认识目标IC，不同目标IC最好用不同IDE，如16F639用6。61版可以，可进入7。5版就不好用，有些IDE版很不完善，可以多试-ICD2
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Size: 173056 |
Author: 刘 |
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Description: 。用8031单片机经8255A扩展2位8段码LED显示器，用8255A的A口作为段码（字形代码）数据口，PB0和PB1作为位控制端口。在位控制口加集电极开路的反相高压驱动器74LS06以提供驱动LED显示器所需的足够大的电流，然后接至各数码显示器的共阴极端。同理，在段码数据口集电极开路的正相高压驱动器74LS07提供足够大的电流，然后接到数码显示器的各段-Simple calculator needs 8 bit 2 segment code LED display circuit. With 8031 MCU by 8255A to extend the 8 bit 2 segment code LED display, with the A 8255A port as the segment code (font code) data port, PB0 and PB1 as a bit control port. In the position control port and an open collector of the reverse voltage driver 74LS06 to provide sufficient current to drive the LED display, and then connect to the common cathode of the digital display. Similarly, normal phase high voltage driver 74LS07 open circuit in the code segment data collector provide enough current, then each received digital display
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Size: 19456 |
Author: 萋萋 |
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