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	<title>udinmduro.com &#187; speakers</title>
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	<link>http://udinmduro.com</link>
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		<title>Skema Rangkaian, Headphone Dengan Infra Red</title>
		<link>http://udinmduro.com/electronic/skema-rangkaian-headphone-dengan-infra-red/</link>
		<comments>http://udinmduro.com/electronic/skema-rangkaian-headphone-dengan-infra-red/#comments</comments>
		<pubDate>Fri, 22 Jan 2010 12:39:14 +0000</pubDate>
		<dc:creator>udinmduro</dc:creator>
				<category><![CDATA[electronic]]></category>
		<category><![CDATA[audio]]></category>
		<category><![CDATA[circuit]]></category>
		<category><![CDATA[schematic]]></category>
		<category><![CDATA[Simple]]></category>
		<category><![CDATA[speakers]]></category>
		<category><![CDATA[stereo sound]]></category>

		<guid isPermaLink="false">http://udinmduro.com/?p=415</guid>
		<description><![CDATA[IR transmitter uses two-stage transistor amplifier to drive two series-connected IR LEDs. An audio output transformer is used (in reverse) to couple audio output from TV to the IR transmitter. Transistors T1 and T2 amplify the audio signals received from TV through the audio transformer. 
Low-impedance output windings (lower gauge or thicker wires) are used for connection to TV side while high-impedance windings are connected to IR transmitter. This IR transmitter can be powered from a 9-volt mains adapter or battery. Red LED1 in transmitter circuit functions as a zener diode (0.65V) as well as supply-on indicator.


IR receiver uses 3-stage transistor amplifier. The first two transistors (T4 and T5) form audio signal amplifier while the third transistor T6 is used to drive a headphone. Adjust potmeter VR2 for max. clarity.
Direct photo-transistor towards IR LEDs of transmitter for max. range. A 9-volt battery can be used with receiver for portable operation.

// ...]]></description>
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		<title>22 Watt Audio</title>
		<link>http://udinmduro.com/electronic/22-watt-audio/</link>
		<comments>http://udinmduro.com/electronic/22-watt-audio/#comments</comments>
		<pubDate>Fri, 21 Aug 2009 19:08:35 +0000</pubDate>
		<dc:creator>udinmduro</dc:creator>
				<category><![CDATA[electronic]]></category>
		<category><![CDATA[audio system]]></category>
		<category><![CDATA[circuit]]></category>
		<category><![CDATA[home theater]]></category>
		<category><![CDATA[speakers]]></category>
		<category><![CDATA[surround sound]]></category>

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		<description><![CDATA[The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and uses only about 60 watts. The circuit is not mine, it came from


R1 :      139K 1/4 Watt Resistor
C1,C2      : 210 uf 25V Electrolytic Capacitor
C3 :      1100 uf 25V Electrolytic Capacitor
C4 :      147uf 25V Electrolytic Capacitor
C5 :      10.1 uf 25V Ceramic Capacitor
C6 :      12200 uf 25V Electrolytic Capacitor
IC :      TDA1554 Two Channel Audio Amp Chip
MISC1Heatsink      For U1,
Binding     ...]]></description>
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