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<channel>
	<title>Kerry D. Wong</title>
	<atom:link href="http://www.kerrywong.com/feed/" rel="self" type="application/rss+xml" />
	<link>http://www.kerrywong.com</link>
	<description></description>
	<lastBuildDate>Sat, 18 May 2013 13:18:35 +0000</lastBuildDate>
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		<item>
		<title>Avalanche Pulse Generator Build Using 2N3904</title>
		<link>http://www.kerrywong.com/2013/05/18/avalanche-pulse-generator-build-using-2n3904/</link>
		<comments>http://www.kerrywong.com/2013/05/18/avalanche-pulse-generator-build-using-2n3904/#comments</comments>
		<pubDate>Sat, 18 May 2013 13:18:35 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[2N2369]]></category>
		<category><![CDATA[2N3904]]></category>
		<category><![CDATA[Avalanche Pulse Generator]]></category>
		<category><![CDATA[LT1073]]></category>
		<category><![CDATA[LT1613]]></category>
		<category><![CDATA[Rise time]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8530</guid>
		<description><![CDATA[Avalanche transistors can be used to generate fast rise time pulses. Their usage in the hobby world was made popular following an application note (AN72) by Jim Williams and was further publicized via this EEVBlog video. Many people have built such avalanche pulse generators for oscilloscope bandwidth measurements. In this post, I will show you [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/05/18/avalanche-pulse-generator-build-using-2n3904/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>QFN Soldering Using SchmartBoard</title>
		<link>http://www.kerrywong.com/2013/05/10/qfn-soldering-using-schmartboard/</link>
		<comments>http://www.kerrywong.com/2013/05/10/qfn-soldering-using-schmartboard/#comments</comments>
		<pubDate>Fri, 10 May 2013 09:00:53 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Miscellaneous]]></category>
		<category><![CDATA[MSP430F5342]]></category>
		<category><![CDATA[QFN]]></category>
		<category><![CDATA[SchmartBoard]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8492</guid>
		<description><![CDATA[I wrote a tutorial a while ago on how to hand solder fine pitched LGA/QFN chips using perfboards. While The technique illustrated works well with low pin count chips, for many people it is still a rather daunting task to solder these tiny chips that way. Also, as the pin count increases hand soldering without [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/05/10/qfn-soldering-using-schmartboard/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Westinghouse L2410NM LCD Power Supply Repair</title>
		<link>http://www.kerrywong.com/2013/05/02/westinghouse-l2410nm-lcd-power-supply-repair/</link>
		<comments>http://www.kerrywong.com/2013/05/02/westinghouse-l2410nm-lcd-power-supply-repair/#comments</comments>
		<pubDate>Fri, 03 May 2013 00:38:42 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Miscellaneous]]></category>
		<category><![CDATA[L2410NM]]></category>
		<category><![CDATA[Westinghouse]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8461</guid>
		<description><![CDATA[My seven year old 24 inch LCD monitor (Westinghouse L2410NM) started to flicker recently, so I decided to take a look inside to see what was wrong. Even before I opened it up, I had a pretty good idea of what might be the culprit. These older LCDs use CCFLs for back-lighting. CCFLs are typically [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/05/02/westinghouse-l2410nm-lcd-power-supply-repair/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Tektronix 2445 Teardown</title>
		<link>http://www.kerrywong.com/2013/04/25/tektronix-2445-teardown/</link>
		<comments>http://www.kerrywong.com/2013/04/25/tektronix-2445-teardown/#comments</comments>
		<pubDate>Thu, 25 Apr 2013 22:26:04 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Miscellaneous]]></category>
		<category><![CDATA[Teardowns]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8371</guid>
		<description><![CDATA[I bought an old Tektronix 2445 150 Mhz oscilloscope on eBay the other day. It was listed under &#8220;For Parts/Not Working&#8221; condition. Since the pictures in the auction listing suggested that the scope powers up and shows traces on all channels, I thought I would get it and fix it up. A couple of days [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/04/25/tektronix-2445-teardown/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Building a Sweep Generator for BK 4011</title>
		<link>http://www.kerrywong.com/2013/04/18/building-a-sweep-generator-for-bk-4011/</link>
		<comments>http://www.kerrywong.com/2013/04/18/building-a-sweep-generator-for-bk-4011/#comments</comments>
		<pubDate>Thu, 18 Apr 2013 22:21:54 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[AVR/Arduino]]></category>
		<category><![CDATA[Atmega328P]]></category>
		<category><![CDATA[DAC0800]]></category>
		<category><![CDATA[Function Generator]]></category>
		<category><![CDATA[LM358]]></category>
		<category><![CDATA[MAX889]]></category>
		<category><![CDATA[Sweep Generator]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8303</guid>
		<description><![CDATA[I did a teardown of a BK Precision 4011 5MHz function generator a few weeks ago. Like most of basic function generators in old days, BK 4011 does not offer frequency sweep as an option. What it does include is a VCG (Voltage controlled Generator) input, which essentially is just a VCO and it can [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/04/18/building-a-sweep-generator-for-bk-4011/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>A Bidirectional Level-Shifting Buffer for Raspberry Pi</title>
		<link>http://www.kerrywong.com/2013/04/11/a-bidirectional-level-shifting-buffer-for-raspberry-pi/</link>
		<comments>http://www.kerrywong.com/2013/04/11/a-bidirectional-level-shifting-buffer-for-raspberry-pi/#comments</comments>
		<pubDate>Thu, 11 Apr 2013 22:31:37 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Miscellaneous]]></category>
		<category><![CDATA[ADG3300]]></category>
		<category><![CDATA[Raspberry Pi]]></category>
		<category><![CDATA[SN74LVC4245A]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8264</guid>
		<description><![CDATA[The current sourcing/sinking capability of the I/O pins on Raspberry Pi is quite limited. According to the Wiki page, the current limit for each I/O block (e.g. GPIO0 through GPIO27 combined) comes at only 26 mA maximum, which is only capable of driving a couple of LEDs at a time. Also the I/O pins are [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/04/11/a-bidirectional-level-shifting-buffer-for-raspberry-pi/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>BK 4011 Function Generator Teardown</title>
		<link>http://www.kerrywong.com/2013/04/04/bk-4011-function-generator-teardown/</link>
		<comments>http://www.kerrywong.com/2013/04/04/bk-4011-function-generator-teardown/#comments</comments>
		<pubDate>Thu, 04 Apr 2013 14:00:28 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Miscellaneous]]></category>
		<category><![CDATA[Product Reviews]]></category>
		<category><![CDATA[Teardowns]]></category>
		<category><![CDATA[BK 4011]]></category>
		<category><![CDATA[Function Generator]]></category>
		<category><![CDATA[MM5369]]></category>
		<category><![CDATA[Teardown]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8226</guid>
		<description><![CDATA[I got a used BK Precision 4011 5MHz function generator recently. The 4011 model is rather old and this particular unit was manufactured back in 1996. But BK precision still makes a similar model (4011A) which is identical to the older 4011 spec-wise except for the inclusion of an additional INV button for inverting the [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/04/04/bk-4011-function-generator-teardown/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>SchmartBoard MSP430F5172 Development Kit</title>
		<link>http://www.kerrywong.com/2013/03/27/schmartboard-msp430f5172-development-kit/</link>
		<comments>http://www.kerrywong.com/2013/03/27/schmartboard-msp430f5172-development-kit/#comments</comments>
		<pubDate>Wed, 27 Mar 2013 22:32:20 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[MSP430G2]]></category>
		<category><![CDATA[BSL]]></category>
		<category><![CDATA[MSP430F5172]]></category>
		<category><![CDATA[MSP430G2231]]></category>
		<category><![CDATA[SchmartBoard]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8124</guid>
		<description><![CDATA[Neal from SchmartBoard sent me an MSP430F5172 development board to check out. This board, according to the website, was co-designed with the University of Colorado for itw educational needs. It is actually just a breakout board for TI&#8217;s MSP430F5172 mixed signal microcontroller with added power regulator circuitry and a conveniently positioned JTAG connector. While there [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/03/27/schmartboard-msp430f5172-development-kit/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Temperature and Humidity Logging Over Ethernet — II</title>
		<link>http://www.kerrywong.com/2013/03/21/temperature-and-humidity-logging-over-ethernet-ii/</link>
		<comments>http://www.kerrywong.com/2013/03/21/temperature-and-humidity-logging-over-ethernet-ii/#comments</comments>
		<pubDate>Thu, 21 Mar 2013 18:10:30 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[AVR/Arduino]]></category>
		<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Arduino]]></category>
		<category><![CDATA[Atmega328P]]></category>
		<category><![CDATA[Data Logging]]></category>
		<category><![CDATA[ENC28J60]]></category>
		<category><![CDATA[SHT21]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8086</guid>
		<description><![CDATA[Last week, I discussed the construction of a network-capable temperature and humidity sensor using SHT21 and ENC28J60 with an ATmega328P microcontroller. In this post, I will show the results obtained so far and the techniques used to chart the data. As I mentioned last time, there was some inherent limitations to the ENC28J60 library which [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/03/21/temperature-and-humidity-logging-over-ethernet-ii/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Temperature and Humidity Logging Over Ethernet &#8212; I</title>
		<link>http://www.kerrywong.com/2013/03/15/temperature-and-humidity-logging-over-ethernet-i/</link>
		<comments>http://www.kerrywong.com/2013/03/15/temperature-and-humidity-logging-over-ethernet-i/#comments</comments>
		<pubDate>Fri, 15 Mar 2013 13:09:46 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[AVR/Arduino]]></category>
		<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Arduino]]></category>
		<category><![CDATA[Atmega328P]]></category>
		<category><![CDATA[Data Logging]]></category>
		<category><![CDATA[ENC28J60]]></category>
		<category><![CDATA[SHT21]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=8039</guid>
		<description><![CDATA[I did a project on temperature/humidity logging a couple of years ago. In that project I logged the temperature and humidity readings in my basement lab over the course of a year. One issue with the approach I took back then was that the data could not be observed in real time because the logged [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/03/15/temperature-and-humidity-logging-over-ethernet-i/feed/</wfw:commentRss>
		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Constant Current Dummy Load In an HDD Cooler</title>
		<link>http://www.kerrywong.com/2013/03/08/constant-current-dummy-load-in-an-hdd-cooler/</link>
		<comments>http://www.kerrywong.com/2013/03/08/constant-current-dummy-load-in-an-hdd-cooler/#comments</comments>
		<pubDate>Fri, 08 Mar 2013 09:00:08 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Constant Current]]></category>
		<category><![CDATA[Current Sink]]></category>
		<category><![CDATA[Dummy Load]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=7982</guid>
		<description><![CDATA[Basic constant current dummy load using an Op Amp and a by-passing MOSFET is very easy to build and had been made quite popular following Dave&#8217;s video on EEVBlog. I happened to have an old aluminum hard disk cooler case collecting dust. The die-cast aluminum case is relatively thick, making it an excellent heat sink. [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/03/08/constant-current-dummy-load-in-an-hdd-cooler/feed/</wfw:commentRss>
		<slash:comments>10</slash:comments>
		</item>
		<item>
		<title>TI MSP430G2 SPI Examples</title>
		<link>http://www.kerrywong.com/2013/03/01/ti-msp430g2-spi-examples/</link>
		<comments>http://www.kerrywong.com/2013/03/01/ti-msp430g2-spi-examples/#comments</comments>
		<pubDate>Fri, 01 Mar 2013 09:00:14 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[MSP430G2]]></category>
		<category><![CDATA[I2C]]></category>
		<category><![CDATA[MSP430 LaunchPad]]></category>
		<category><![CDATA[MSP430G2231]]></category>
		<category><![CDATA[SPI]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=7936</guid>
		<description><![CDATA[In my earlier posts (1, 2, 3), I showed some examples of using the I2C protocol with TI&#8217;s MSP430 Launchpad. Many MCUs in the MSP430G2 family also support the SPI bus. In today&#8217;s discussion, I will give a couple of examples on communicating with an SPI port expander (MCP23S17). Dave has written a great tutorial [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/03/01/ti-msp430g2-spi-examples/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Arduino Library For LM95172 Temperature Sensor</title>
		<link>http://www.kerrywong.com/2013/02/21/arduino-library-for-lm95172-temperature-sensor/</link>
		<comments>http://www.kerrywong.com/2013/02/21/arduino-library-for-lm95172-temperature-sensor/#comments</comments>
		<pubDate>Fri, 22 Feb 2013 01:01:23 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[AVR/Arduino]]></category>
		<category><![CDATA[LM95172]]></category>
		<category><![CDATA[Temperature Sensor]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=7869</guid>
		<description><![CDATA[LM95172 is a 13 to 16 bits wide temperature range automotive-grade temperature sensor in a ceramic SOIC package. Besides its wide range temperature measurements capability (-40 Celsius to 200 Celsius), it can also be programmed to trigger over-temperature/under-temperature alarms and perform one-shot temperature conversation for low power applications. In this post, I will go over [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/02/21/arduino-library-for-lm95172-temperature-sensor/feed/</wfw:commentRss>
		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Adding a Barrel Jack And a Switch to Raspberry Pi</title>
		<link>http://www.kerrywong.com/2013/02/14/adding-a-barrel-jack-and-a-switch-to-raspberry-pi/</link>
		<comments>http://www.kerrywong.com/2013/02/14/adding-a-barrel-jack-and-a-switch-to-raspberry-pi/#comments</comments>
		<pubDate>Thu, 14 Feb 2013 23:17:52 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[Miscellaneous]]></category>
		<category><![CDATA[Barrel Jack]]></category>
		<category><![CDATA[Raspberry Pi]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=7833</guid>
		<description><![CDATA[I got myself a Raspberry Pi (Model B V2) last month. After having played with it for a while, I have to say that I really like this tiny single-board computer. Since it runs on Linux, you can compile and run your C/C++ code on it. Most popular applications have already been adapted to the [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/02/14/adding-a-barrel-jack-and-a-switch-to-raspberry-pi/feed/</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Precision Voltage Adapter For Low Voltage Measurement</title>
		<link>http://www.kerrywong.com/2013/02/06/precision-voltage-adapter-for-low-voltage-measurement/</link>
		<comments>http://www.kerrywong.com/2013/02/06/precision-voltage-adapter-for-low-voltage-measurement/#comments</comments>
		<pubDate>Thu, 07 Feb 2013 00:10:36 +0000</pubDate>
		<dc:creator>kwong</dc:creator>
				<category><![CDATA[Electronics]]></category>
		<category><![CDATA[LMP8358]]></category>

		<guid isPermaLink="false">http://www.kerrywong.com/?p=7791</guid>
		<description><![CDATA[A typical 3 &#189; or 4 &#189; multimeter can measure voltage in the low mV range and current in the low mA range. Voltage measurement in the &#181;V range and current measurement in the nA range are typically only available in the more expensive lab bench multimeters. In this post, I will show you a [...]]]></description>
		<wfw:commentRss>http://www.kerrywong.com/2013/02/06/precision-voltage-adapter-for-low-voltage-measurement/feed/</wfw:commentRss>
		<slash:comments>2</slash:comments>
		</item>
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