随笔分类 - Circuit
摘要：http://www.willar.com/article/article_view.asp?id=463由DC-DC变换集成电路MC34063组成，34063 广泛应用于于DC-DC的电源转换电路中，本电路中的34063 接成升压电路形式，将5V电压升压到12-14.5V，得到编程所需的Vpp电压，R8、R9、R10组成电压取样电路。R11和Q1组成14V VPP电压切换电路Vout(输出电压)＝1.25V（１＋R2／R1）= 1.25V * ( (R1+R2) / R1 )R1=R10+R9=0.56K + 1.8K=2.36KR2=R8=20KVout = 1.25 * ( ( 2.36
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posted @ 2013-07-15 14:28
IAmAProgrammer
摘要：Voltage Translation for Analog to Digital Interface ADChttp://openschemes.com/2010/03/23/zeroplus-logic-cube-review-and-teardown/LAP 16032 has 4.5MBIT...
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posted @ 2013-07-15 13:11
IAmAProgrammer
摘要：http://www.faludi.com/bwsn/xbee-level-shifting/The XBee communication (RX/TX) pins definitelyoperateoff of a 5V signal with the Arduino. We’ve seen this a lot and done this a lot, and it certainly keeps things simple. That said, there’s nothing wrong with adding a level-shifting circuit to deliver 3
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posted @ 2013-07-15 12:21
IAmAProgrammer
摘要：http://www.daycounter.com/Circuits/Level-Translators/Level-Translators.phtmlInterfacing 5V and 3V logic circuits is a common task. 3V logic is preferred to 5V logic because it consumes less power, so most microcontrollers and peripheral devices use the lower voltage logic. However, it is often the c
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posted @ 2013-07-15 12:04
IAmAProgrammer
摘要：http://www.daycounter.com/Circuits/Short-Circuit-Protection/Short-Circuit-Protection.phtmlShort circuit protection is often a desirable feature to add to power amplifiers or power supplies, for both safety concerns and protection of circuitry.The circuit in the schematic below can be used to protect
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posted @ 2013-07-15 12:01
IAmAProgrammer
摘要：http://electronicdesign.com/boards/non-inverting-level-shifter-requires-only-one-op-amp-one-supply-voltageWith portable battery-operated devices continuing to add functionality while shrinking in size, printed-circuit-board real estate becomes increasingly valuable. Single-supply circuitry can help
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posted @ 2013-07-15 11:57
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 21:58
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 21:21
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 01:40
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 01:36
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 01:29
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 01:18
IAmAProgrammer
摘要：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
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posted @ 2013-07-14 01:15
IAmAProgrammer
摘要：BeeHive204 Very fast universal 4x 48-pindrive concurrent multiprogramming system with ISP capabilityBeeProg2 Very fast universal 48-pindrive Programmer with USB/LPT interface and ISP capabilityBeeProg2C Very fast universal 48-pindrive Programmer with USB interface and ISP capabilityBeeProg+ Universa
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posted @ 2013-07-13 23:50
IAmAProgrammer
摘要：FeaturesSEEprogis universal programmer of all types of serial EEPROMs in 8-pin package. SEEprog enables programming EEPROMs with interface types IIC (24Cxx), Microwire (93Cxx) and SPI (25Cxx). Programmer supports programming LV EEPROMs (3.3V). The programmer is equipped by ZIF socket. The quality of
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posted @ 2013-07-13 21:59
IAmAProgrammer
摘要：http://www.elnec.com/products/universal-programmers/beeprog2c/FPGA basedtotally reconfigurable 48powerful TTL pindriversprovide H/L/pull_up/pull_down and read capability for each pin of socket. Advanced pindrivers incorporatehigh-quality high-speedcircuitry to deliver signals without overshoot or gr
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posted @ 2013-07-13 21:57
IAmAProgrammer
摘要：http://www.elnec.com/products/universal-programmers/smartprog2/40powerful TTL pindriversprovide H/L/pull_up/pull_down and read capability for each pin of socket. Advanced pindrivers incorporatehigh-quality high-speedcircuitry to deliver signals without overshoot or ground bounce for all supported de
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posted @ 2013-07-13 21:49
IAmAProgrammer
摘要：http://www.circuitsathome.com/mcu/pic_vpp_limiterVOUT = 2.5V * ( 1 + 24/10 ) = 2.5 * 3.4 = 8.5VNewer PIC18s, such as my current favorite – PIC18F26K20, don’t like to be programmed with 12V. The datasheet maximum is 9V. Older Microchip programmers/debuggers, such as PicKit and ICD 2, do not support v
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posted @ 2013-07-13 21:18
IAmAProgrammer
摘要：所有专为驱动白光LED而设计的IC都提供恒定电流夕其中尽大多数是基于电感或电荷泵的解决方案9这两种解决方案各有其优缺点。 电荷泵解决方案也称为开关电容器解决方案，利用分离电容器将电源从输进端传送至输出端，整个过程不需使用任何电感男所以是受欢迎的解决方案。电荷泵电源的体积很小，设计也很简单，选择组件时通常只需根据组件规格从中挑选适当的电容器。 电荷泵解决方案的主要缺点是它只能提供有限的输出电压范围，尽大多数电荷泵的转换比率最多只能达到输进电压的两倍，这表示输出电压不可能高于输进电压的两倍。因此，若想利用电荷泵驱动一个以上的白光LED，就必须采用并联驱动的方式。利用只能对输出电压进行稳压的电荷..
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posted @ 2013-07-13 21:01
IAmAProgrammer
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