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74HC245/74HCT245The 74HC245; 74HCT245 is a high-speed Si-gate CMOS device and is pin compatiblewith Low-Power Schottky TTL (LSTTL).The 74HC245; 74HCT245 is an octal transceiver featuring non-inverting 3-state buscompatible outputs in both send and receive directions. The 74HC245; 74HCT245features an 阅读全文
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http://www.amobbs.com/thread-5541344-1-2.html3.3V转5V：S3输入为0V时，NMOS管导通，S5＝S3＝0V；S3输入为3.3V时，NMOS管截止，S5上拉到5V；5V转3.3V：S5输入为0V时，NMOS管体二极管导通，S3＝0.7V，此时NMOS管导通，S3＝S5＝0V；S5输入为5V时，NMOS管截止，S3上拉到3.3V。NMOS管可以选用BSS138R2可以省略，NMOS管G极可以直接连接到3.3V电源，R2的作用是改善EMI性能。AN97055I2C电平转换 阅读全文
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The TPS703xx family of devices is designed to provide a complete power management solution for TI DSP, processor power, ASIC, FPGA, and digital applications where dual output voltage regulators are required. Easy programmability of the sequencing function makes this family ideal for any TI DSP appli 阅读全文
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In need of a programmer for PIC micro controllers I decided to build my own one. This programmer has been designated as "PIC JDM Prototype Programmer 1001" because it is very likely the 1001st PIC programmer :-)The programmer is basically operating as aJDM-programmer. Any programming softw 阅读全文
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http://www.romanblack.com/smps/conv.htmWhat is it?This is a simple smps voltage converter,it makes an output voltage of +13.3v from a "standard" +5v supply as used with logic chips.I was contacted by hobby PIC programmer legendMyke Predkoabout designing a simple and cheap circuit to produc 阅读全文
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http://www.nomad.ee/micros/mc34063a/index.shtmlThis is a simple-minded design tool that allows you to calculate component values MC34063A simple switcher chip. It displays the appropriate scematic diagram (step-up, step-down, or inverting) and checks for current and voltage limits. Feedback resistor 阅读全文
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http://simon.derr.free.fr/site/spip/spip.php?article11This is a description of my very simplified home-made pickit2 clone.Basically I took the schematic in the User Guide and removed everything I could.What I removed:Leds (pretty useless)The eeproms (they are not even used by the firmware)The Vdd ci 阅读全文
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http://uzzors2k.4hv.org/index.php?page=usbpicprogMy Tait Serial programmer works alright, but not every computer has a parallel port, and these days they're almost extinct. Most laptop don't even have a serial port! Thinking ahead a USB programmer seems like a smart investment. Fortunately s 阅读全文