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2015-06-15	209.212.158.122 (ClassC)
2025-01-22	185.224.138.27 (ClassC)

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!DOCTYPE html PUBLIC -//W3C//DTD XHTML 1.0 Transitional//EN http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd>html xmlnshttp://www.w3.org/1999/xhtml>head>	meta http-equivContent-Type contenttext/html; charsetutf-8 />	meta namedescription content />		meta namekeywords 	 content />		title>Free electronics circuit diagrams archive | Free projects for hobbyists/title>	link hrefhttp://www.hobby-circuits.com/css/style.css relstylesheet typetext/css />	link hrefhttp://www.hobby-circuits.com/css/menu_style.css relstylesheet typetext/css />	link hrefhttp://www.hobby-circuits.com/css/jquery.lightbox-0.5.css relstylesheet typetext/css />			script typetext/javascript srchttps://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js>/script>		script typetext/javascript srchttp://platform.twitter.com/widgets.js>/script>	script typetext/javascript srchttps://apis.google.com/js/plusone.js>/script>	script typetext/javascript srchttp://connect.facebook.net/en_US/all.js#xfbml1>/script>		script 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hrefhttp://www.hobby-circuits.com/circuits/alarms-and-security/lock>Lock/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/alarms-and-security/miscellaneous-security>Miscellaneous security/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/alarms-and-security/motorcycle-alarm>Motorcycle alarm/a>/li>															/ul>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/audio>Audio/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/audio-amplifier>Audio amplifier/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/audio-filter>Audio filter/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/audio-mixer>Audio mixer/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/audio-preamplifier>Audio preamplifier/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/sound-level-meter>Sound level meter/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/speaker-protection>Speaker protection/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/audio/tone-and-volume-control>Tone and volume control/a>/li>															/ul>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/automotive>Automotive/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/automotive/automotive-light>Automotive light/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/automotive/automotive-miscellaneous>Automotive miscellaneous/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/automotive/car-battery-related>Car battery related/a>/li>															/ul>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/digital>Digital/a>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/for-home>For home/a>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/fun-and-games>Fun and games/a>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/general-electronics>General electronics/a>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/high-voltage>High voltage/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/high-voltage/miscellaneous-hv>Miscellaneous HV/a>/li>															/ul>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/infrared>Infrared/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/infrared/ir-remote-control>IR remote control/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/infrared/miscellaneous-ir>Miscellaneous IR/a>/li>															/ul>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/led-and-light>LED and light/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/led-and-light/led-driver>LED driver/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/led-and-light/light-dimmer>Light dimmer/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/led-and-light/light-flasher>Light flasher/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/led-and-light/neon-lights-driver>Neon lights driver/a>/li>															/ul>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/metronome>Metronome/a>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/microcontroller>Microcontroller/a>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/miscellaneous>Miscellaneous/a>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/pc-related>PC related/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/pc-related/usb-devices>USB devices/a>/li>															/ul>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/power-supply>Power supply/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/power-supply/battery-charger>Battery charger/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/power-supply/battery-tester>Battery tester/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/power-supply/dc-power-supply>DC power supply/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/power-supply/dc-to-ac-inverter>DC to AC inverter/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/power-supply/dc-to-dc-converter>DC to DC converter/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/power-supply/miscellaneous-power>Miscellaneous power/a>/li>															/ul>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/pwm-and-power-control>PWM and power control/a>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/radio>Radio/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/radio/am-receiver>AM receiver/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/radio/am-transmitter>AM transmitter/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/radio/antenna>Antenna/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/radio/fm-transmitter>FM transmitter/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/radio/remote-control>Remote control/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/radio/signal-meter>Signal meter/a>/li>															/ul>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/sensor>Sensor/a>																												ul classul-main-submenu  >																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/fluid-and-humidity>Fluid and humidity/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/light-sensor>Light sensor/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/lightning-detector>Lightning detector/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/magnetic-sensor>Magnetic sensor/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/metal-detector>Metal detector/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/miscellaneous-sensor>Miscellaneous sensor/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/sound-sensor>Sound sensor/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/temperature-sensor>Temperature sensor/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/touch-sensor>Touch sensor/a>/li>																li   >a hrefhttp://www.hobby-circuits.com/circuits/sensor/voltage-and-current>Voltage and current/a>/li>															/ul>																																		/li>												li classblue-n >a   classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/solar-power>Solar power/a>																																		/li>												li classblue-p >a  href# classa-clickzone>/a>a hrefhttp://www.hobby-circuits.com/circuits/sound-and-oscillator>Sound and oscillator/a>																												ul 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games/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/general-electronics>img altGeneral electronics titleGeneral electronics srchttp://www.hobby-circuits.com/images/cats/104.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/general-electronics>General electronics/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/high-voltage>img altHigh voltage titleHigh voltage srchttp://www.hobby-circuits.com/images/cats/41.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/high-voltage>High voltage/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/infrared>img altInfrared titleInfrared srchttp://www.hobby-circuits.com/images/cats/58.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/infrared>Infrared/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/led-and-light>img altLED and light titleLED and light 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hrefhttp://www.hobby-circuits.com/circuits/switches>img altSwitches titleSwitches srchttp://www.hobby-circuits.com/images/cats/100.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/switches>Switches/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/telephone-related>img altTelephone related titleTelephone related srchttp://www.hobby-circuits.com/images/cats/50.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/telephone-related>Telephone related/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/timer>img altTimer titleTimer srchttp://www.hobby-circuits.com/images/cats/38.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/timer>Timer/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/tools-and-measuring>img altTools and measuring titleTools and measuring srchttp://www.hobby-circuits.com/images/cats/40.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/tools-and-measuring>Tools and measuring/a>		/div>			div classdiv-cat-holder>			a hrefhttp://www.hobby-circuits.com/circuits/video>img altVideo titleVideo srchttp://www.hobby-circuits.com/images/cats/95.png />/a>			br />			a hrefhttp://www.hobby-circuits.com/circuits/video>Video/a>		/div>		/div>	/div>div classdiv-cont-main-rbox rounded10>	div stylefloat:left; width:120px;>		a hrefhttp://twitter.com/share classtwitter-share-button data-countvertical>Tweet/a>		g:plusone sizetall>/g:plusone>	/div>	div stylefloat:left; width:52px; padding-top:2px;>		div idfb-root>/div>fb:like href sendfalse layoutbox_count width450 show_facesfalse font>/fb:like>	/div>	/div>div classdiv-cont-main-rbox rounded10>	h2>Random circuits/h2>		p>Here are some of over 800 projects from our free circuit diagrams database. For more, try browsing categories menu on the left./p>						div stylewidth:320px; float:left; padding:5px 10px 10px 10px; border-bottom:0px solid gray; min-height:160px; margin:12px>			span styledisplay:block; margin-bottom:5px; border-bottom:2px solid #0079B2;>a style font-size:0.8em; text-decoration:none; font-weight:bolder hrefhttp://www.hobby-circuits.com/circuits/sensor/temperature-sensor/905/temperature-controlled-switch>Temperature-Controlled Switch/a>/span>						p style>				a hrefhttp://www.hobby-circuits.com/circuits/sensor/temperature-sensor/905/temperature-controlled-switch>					img stylemargin:5px 10px 5px 0px; float:left; width:120px; padding: 3px; border: 1px solid #CECED1; alt srchttp://www.hobby-circuits.com/files/905/temperature-controlled-switch_th.gif />				/a>			It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when you’re building this sort of electronic thermostat. There are a lot of handy uses for a thermally controlled switch. If the temperature inside your PC gets too high sometimes, the circuit can switch on an extra fan. You can also use to switch on an electric heater automatically if the room temperature is too low. There are innumerable potential applications for the thermostat described here....			a hrefhttp://www.hobby-circuits.com/circuits/sensor/temperature-sensor/905/temperature-controlled-switch>strong>read more/strong>/a>			/p>		/div>										div stylewidth:320px; float:left; padding:5px 10px 10px 10px; border-bottom:0px solid gray; min-height:160px; margin:12px>			span styledisplay:block; margin-bottom:5px; border-bottom:2px solid #0079B2;>a style font-size:0.8em; text-decoration:none; font-weight:bolder hrefhttp://www.hobby-circuits.com/circuits/timer/638/generating-a-delayed-pulse-using-the-555-timer>Generating a Delayed Pulse Using The 555 Timer/a>/span>						p style>				a hrefhttp://www.hobby-circuits.com/circuits/timer/638/generating-a-delayed-pulse-using-the-555-timer>					img stylemargin:5px 10px 5px 0px; float:left; width:120px; padding: 3px; border: 1px solid #CECED1; alt srchttp://www.hobby-circuits.com/files/638/generating-a-delayed-pulse-using-the-555-timer_th.gif />				/a>			The circuit illustrates generating a single positive pulse which is delayed relative to the trigger input time....			a hrefhttp://www.hobby-circuits.com/circuits/timer/638/generating-a-delayed-pulse-using-the-555-timer>strong>read more/strong>/a>			/p>		/div>				div stylefloat:left; width:100%;>/div>						div stylewidth:320px; float:left; padding:5px 10px 10px 10px; border-bottom:0px solid gray; min-height:160px; margin:12px>			span styledisplay:block; margin-bottom:5px; border-bottom:2px solid #0079B2;>a style font-size:0.8em; text-decoration:none; font-weight:bolder hrefhttp://www.hobby-circuits.com/circuits/tools-and-measuring/conductivity-tester/74/connection-tester>Connection Tester/a>/span>						p style>				a hrefhttp://www.hobby-circuits.com/circuits/tools-and-measuring/conductivity-tester/74/connection-tester>					img stylemargin:5px 10px 5px 0px; float:left; width:120px; padding: 3px; border: 1px solid #CECED1; alt srchttp://www.hobby-circuits.com/files/74/connection-tester_th.gif />				/a>			A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections....			a hrefhttp://www.hobby-circuits.com/circuits/tools-and-measuring/conductivity-tester/74/connection-tester>strong>read more/strong>/a>			/p>		/div>										div stylewidth:320px; float:left; padding:5px 10px 10px 10px; border-bottom:0px solid gray; min-height:160px; margin:12px>			span styledisplay:block; margin-bottom:5px; border-bottom:2px solid #0079B2;>a style font-size:0.8em; text-decoration:none; font-weight:bolder hrefhttp://www.hobby-circuits.com/circuits/audio/tone-and-volume-control/329/simple-digital-volume-control>Simple Digital Volume Control/a>/span>						p style>				a hrefhttp://www.hobby-circuits.com/circuits/audio/tone-and-volume-control/329/simple-digital-volume-control>					img stylemargin:5px 10px 5px 0px; float:left; width:120px; padding: 3px; border: 1px solid #CECED1; alt srchttp://www.hobby-circuits.com/files/329/simple-digital-volume-control_th.gif />				/a>			This digital volume control has no pot to wear out and introduces almost no noise in the circuit. Instead, the volume is controlled by pressing UP and DOWN buttons. This simple circuit would be a great touch to any home audio project....			a hrefhttp://www.hobby-circuits.com/circuits/audio/tone-and-volume-control/329/simple-digital-volume-control>strong>read more/strong>/a>			/p>		/div>				div stylefloat:left; width:100%;>/div>						div stylewidth:320px; float:left; padding:5px 10px 10px 10px; border-bottom:0px solid gray; min-height:160px; margin:12px>			span styledisplay:block; margin-bottom:5px; border-bottom:2px solid #0079B2;>a style font-size:0.8em; text-decoration:none; font-weight:bolder hrefhttp://www.hobby-circuits.com/circuits/infrared/ir-remote-control/154/ir-remote-control-jammer>IR Remote Control Jammer/a>/span>						p style>				a hrefhttp://www.hobby-circuits.com/circuits/infrared/ir-remote-control/154/ir-remote-control-jammer>					img stylemargin:5px 10px 5px 0px; float:left; width:120px; padding: 3px; border: 1px solid #CECED1; alt srchttp://www.hobby-circuits.com/files/154/ir-remote-control-jammer_th.gif />				/a>			Dont like your little brothers TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that confuses the reciever by corrupting the data stream....			a hrefhttp://www.hobby-circuits.com/circuits/infrared/ir-remote-control/154/ir-remote-control-jammer>strong>read more/strong>/a>			/p>		/div>										div stylewidth:320px; float:left; padding:5px 10px 10px 10px; border-bottom:0px solid gray; min-height:160px; margin:12px>			span styledisplay:block; margin-bottom:5px; border-bottom:2px solid #0079B2;>a style font-size:0.8em; text-decoration:none; font-weight:bolder hrefhttp://www.hobby-circuits.com/circuits/sensor/sound-sensor/784/room-noise-detector-circuit-schematic>Room Noise Detector Circuit Schematic/a>/span>						p style>				a hrefhttp://www.hobby-circuits.com/circuits/sensor/sound-sensor/784/room-noise-detector-circuit-schematic>					img stylemargin:5px 10px 5px 0px; float:left; width:120px; padding: 3px; border: 1px solid #CECED1; alt srchttp://www.hobby-circuits.com/files/784/room-noise-detector-circuit-schematic_th.gif />				/a>			This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret microphone to drive a LED. With SW1 in the first position the circuit is off. Second, third and fourth positions power the circuit and set the input sensitivity threshold to 85, 70 & 50 dB respectively. Current drawing is 1mA with LED off and 12-15mA when the LED is steady on....			a hrefhttp://www.hobby-circuits.com/circuits/sensor/sound-sensor/784/room-noise-detector-circuit-schematic>strong>read more/strong>/a>			/p>		/div>				div stylefloat:left; width:100%;>/div>				/div>div classdiv-cont-main-rbox rounded10>	div stylefloat:left; width:120px;>		a hrefhttp://twitter.com/share classtwitter-share-button data-countvertical>Tweet/a>		g:plusone sizetall>/g:plusone>	/div>	div stylefloat:left; width:52px; padding-top:2px;>		div idfb-root>/div>fb:like href sendfalse layoutbox_count width450 show_facesfalse font>/fb:like>	/div>	/div>			!-- div-cont-main -->			/div>				/div>            	div iddiv-footer classdivs-layout>			div iddiv-footer-round classrounded10>        	Copyright by ALLO © 2025.			br />			0.0016s, 0.36MB			/div>        /div>    /div>						/body>/html>

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