Archive for May, 2011

Heat Sensitive Switch using LM35 At the heart of this heat-sensitive switch is IC LM35 (IC1), which is a linear temperature sensor and linear temperature-to-voltage converter circuit. The converter provides accurately linear and directly proportional output signal in millivolts over the temperature range of 0°C to 155°C. It develops an output voltage of 10 mV per degree….

Temperature Controlled NICD Charger by IC LM311 This circuit is for a temperature controlled constant current battery charger. It works with NICD, NIMH, and other rechargeable cells. The circuit works on the principle that most rechargeable batteries show an increase in temperature when the cells becomes fully charged. ….

Digital temperature sensor Here is a straight forward ,yet effective digital temperature controller that can be used with temperature control systems.The circuit uses IC LM35 (IC3) to sense the temperature.The output of LM35 is given to the IC ADC0804 (IC4) which converts the analog…..

Temperature controlled Fan 12V dc Requested by some correspondents, this simple design allows an accurate speed control of 12V dc fan motors, proportional to temperature. A n.t.c. Thermistor (R1) is used as temperature sensor, driving two directly coupled complementary transistors wired in a dc feedback circuit.

Temperature Monitor with IC LM741 or LM301 My Friend want circuit Temperature Monitor for control relay. I find on internet , See to This Web http://www.mitedu.freeserve.co.uk/Circuits good article circuit. The Temperature Monitor use IC LM741 or IC 301 for test Temperature control relay switch…….

This is more sound effects circuits link, for basic ideas.
Sound Effects Generator by UM3561 This circuit uses a UM3561 IC to produce four different sound effects.
Nothing too complicated here. The IC produces all the sound effects, the output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker can be substituted in place of the 56 ohm resistor and 8 ohm loudspeaker…..
Rain sound effect Generator by 4060 Sound effects generators trying to imitate rain sound or sea surf are well known to hobbyists from many years: their purpose is to induce relaxation and sleep or to help in concentration and study.The sound generated is restrained to a background level and these devices are frequently kept on the night table…..
Siren Sound Effects Kit This fun little sound generator is more than a siren. Once assembled you can create your choice of 4 different sound effects: Police siren, fire brigade, emergency vehicle, and laser gun! Use the laser gun to go on a rampage, and then just call in the police and fire vehicles to clean up your mess! …..

This is sound activated switch circuit diagram. they has useful for controller circuit with any sound.
Sound Activated Switch Circuit Sound SCR Switch by IC 1458 & SCR C106D PCB Sound SCR Switch by IC 1458 & SCR … Posted in Circuit diagram, Electronic Control | …

Sound Operated Switch by BC109 This sensitive sound operated switch can be used with a … pm and is filed under Audio – Alarm, Circuit diagram, Electronic Control. …

Sound SCR Switch by IC 1458 & SCR C106D This is Electronic Switch, Control by Sound. It is mini Circuit and easy, use IC … May 22nd, 2007 at 11:17 pm and is filed under Circuit diagram, Electronic Control. … Frost Alarm or Cold Activated Switch by IC 741 …

The Might-D-Light rechargeable folding worklight is portable, compact and versatile. The light weight innovative folding design is unlike any other sticklight. The Might-D-Light offers 80 bright white LEDs that never need to be replaced. These energy efficient LEDs illuminate your projects without the heat of typical halogen worklights. The innovative patent pending design folds for convenient, easy storage. The friction tension hinge allows for flexible and easy adjustments from 0 degrees up to 200 degrees. Two integrated neodymium rare earth magnets which attach to most metals surfaces and a nylon swivel hook allow for hands-free use….
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Find out who’s telling the truth – and who’s not – by giving them a lie detector test. First, attach the sensor to your suspect’s finger. Start off with some easy questions to get warmed up. Then, when they least expect it, jump in with the hard-hitting questions to really make ‘em squirm. Watch the indicator lights – they light up when your suspect isn’t telling the truth. Read more