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	<title>delabs Schematics - Electronic Circuit &#187; LED-Circuits</title>
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	<description>Electronic Schematic Diagrams of delabs</description>
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		<title>Perpetual Candle &#8211; White LED Lamp on Ni-Cd</title>
		<link>http://www.electronics-circuits.com/tech/2009/10/perpetual-candle-white-led-lamp-on-ni-cd/</link>
		<comments>http://www.electronics-circuits.com/tech/2009/10/perpetual-candle-white-led-lamp-on-ni-cd/#comments</comments>
		<pubDate>Thu, 15 Oct 2009 13:04:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[LED-Circuits]]></category>
		<category><![CDATA[Lighting-Circuits]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2009/10/perpetual-candle-white-led-lamp-on-ni-cd/</guid>
		<description><![CDATA[This is a easy to build LED lamp circuit for Learning and building skills. This is the first draft schematic V 1.0. It will need improvements for Higher Power Lighting. From Schematics of delabs I will give a short summary, The LM317 here configured for around 6.4V DC. The Q3 BC547 limits the current, you <a href='http://www.electronics-circuits.com/tech/2009/10/perpetual-candle-white-led-lamp-on-ni-cd/'>Read More ...</a>]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Resistance Measurement Analog LED Meter</title>
		<link>http://www.electronics-circuits.com/tech/2009/02/resistance-measurement-analog-led-meter/</link>
		<comments>http://www.electronics-circuits.com/tech/2009/02/resistance-measurement-analog-led-meter/#comments</comments>
		<pubDate>Sun, 22 Feb 2009 02:05:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[LED-Circuits]]></category>
		<category><![CDATA[Opamp-Circuits]]></category>
		<category><![CDATA[Test-Measurement]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2009/02/resistance-measurement-analog-led-meter/</guid>
		<description><![CDATA[This is a LED Analog Meter, This can be used as a Resistance Meter and Low Impedance Voltmeter for Battery Levels. To measure battery voltage, the R5-R12-R17 etc. part of the Reference Resistor Divider Network can be modified to suit. Shown here is for 4 LEDs, Use Three LM324 for 12 or More LEDs and <a href='http://www.electronics-circuits.com/tech/2009/02/resistance-measurement-analog-led-meter/'>Read More ...</a>]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>InfraRed Detector for Proximity Switch</title>
		<link>http://www.electronics-circuits.com/tech/2008/12/infrared-detector-for-proximity-switch/</link>
		<comments>http://www.electronics-circuits.com/tech/2008/12/infrared-detector-for-proximity-switch/#comments</comments>
		<pubDate>Sun, 14 Dec 2008 08:30:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[LED-Circuits]]></category>
		<category><![CDATA[Opamp-Circuits]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2008/12/infrared-detector-for-proximity-switch/</guid>
		<description><![CDATA[The proximity switch can work for a wide range of power, from 8v to 18v DC, D3 protects reverse power supply connections, and U1 regulates the supply to +5v , -5v is derived from U2 555 oscillator which serves dual purpose. Circuit Operation The infra red diode D2 detector gets the reflected light from LED <a href='http://www.electronics-circuits.com/tech/2008/12/infrared-detector-for-proximity-switch/'>Read More ...</a>]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>InfraRed LED Flasher for Optical Switch</title>
		<link>http://www.electronics-circuits.com/tech/2008/12/infrared-led-flasher-for-optical-switch/</link>
		<comments>http://www.electronics-circuits.com/tech/2008/12/infrared-led-flasher-for-optical-switch/#comments</comments>
		<pubDate>Sun, 14 Dec 2008 07:30:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[555-Circuits]]></category>
		<category><![CDATA[LED-Circuits]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2008/12/infrared-led-flasher-for-optical-switch/</guid>
		<description><![CDATA[This circuit is used to detect objects by reflected infrared light. It can be built into a cylindrical enclosure just like an inductive proximity switch. This is also useful as a level detector for colored liquids like oil. This has some immunity to ambient sunlight as it detects ac pulses. IC 555 is used as <a href='http://www.electronics-circuits.com/tech/2008/12/infrared-led-flasher-for-optical-switch/'>Read More ...</a>]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>LM555 Voltage Doubler</title>
		<link>http://www.electronics-circuits.com/tech/2007/02/lm555-voltage-doubler/</link>
		<comments>http://www.electronics-circuits.com/tech/2007/02/lm555-voltage-doubler/#comments</comments>
		<pubDate>Fri, 02 Feb 2007 14:33:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[555-Circuits]]></category>
		<category><![CDATA[LED-Circuits]]></category>
		<category><![CDATA[Power-Supplies]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2007/02/lm555-voltage-doubler/</guid>
		<description><![CDATA[This circuit shows the voltage doubler working with a 555. LM555 has good drive 200mA, both Vcc and Gnd. LM555 &#8211; Timer LM555 Timer Circuits Voltage Multipliers Jochens High Voltage Page]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>FET Current Source and MOSFET</title>
		<link>http://www.electronics-circuits.com/tech/2007/02/fet-current-source/</link>
		<comments>http://www.electronics-circuits.com/tech/2007/02/fet-current-source/#comments</comments>
		<pubDate>Thu, 01 Feb 2007 11:45:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Discrete-Circuits]]></category>
		<category><![CDATA[LED-Circuits]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2007/02/fet-current-source/</guid>
		<description><![CDATA[This is a constant current source using a FET. This is the most simple replacement to series resistor to limit current. The N-Channel FET BF256C can give 15mA current. Simple Methods Before you get to use chips, experiment with some methods, which will help you learn about the LEDs better. The first is just One <a href='http://www.electronics-circuits.com/tech/2007/02/fet-current-source/'>Read More ...</a>]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Constant Current Source LED Drive</title>
		<link>http://www.electronics-circuits.com/tech/2007/02/constant-current-source-led-drive/</link>
		<comments>http://www.electronics-circuits.com/tech/2007/02/constant-current-source-led-drive/#comments</comments>
		<pubDate>Thu, 01 Feb 2007 16:16:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
				<category><![CDATA[Discrete-Circuits]]></category>
		<category><![CDATA[LED-Circuits]]></category>

		<guid isPermaLink="false">http://www.electronics-circuits.com/tech/2007/02/constant-current-source-led-drive/</guid>
		<description><![CDATA[This is a Constant Current Source LED Driver, When the LED driver Upper-NPN is driven by a voltage thru 4.7K the LED lights up. Assume that the Lower-NPN at bottom is absent. The current via LED and NPN is limited by R. 20mA may be ok 15mA even better. Or LED blows even transistor goes. <a href='http://www.electronics-circuits.com/tech/2007/02/constant-current-source-led-drive/'>Read More ...</a>]]></description>
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		<slash:comments>1</slash:comments>
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