Digital Volume Control 2

Published:2012/12/12 0:37:00 Author:muriel | Keyword: Digital Volume Control

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Tone Control circuit

Published:2012/12/12 0:28:00 Author:muriel | Keyword: Tone Control circuit

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Alarm circuit diagram using pyroelectric sensor

Published:2012/12/11 0:04:00 Author:Ecco | Keyword: Alarm , pyroelectric sensor

The circuit is composed of amplifier, comparator and an output control part. According to Faraday's law, person's body temperature is about 37 ℃, radiation infrared wavelength is about 10μm, the pyroelectric sensor selects P7178 with 7 ~ 20μm sensitive wavelength range. A1 and A2 are selected low noise, low loss CMOS op amp μPC358, and it is connected to band-pass filter composed of RC to prevent the entry of the noise and error signal, extracting only a signal when the human body moves. A3 and A4 constitute a comparator.   (View)

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Automatic Load Sensing Power Switch

Published:2012/12/11 0:38:00 Author:muriel | Keyword: Automatic, Load Sensing, Power Switch

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Wire Loop Alarm

Published:2012/12/11 0:35:00 Author:muriel | Keyword: Wire Loop, Alarm

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Video Stabilizer/MacroVision Removal

Published:2012/12/11 0:33:00 Author:muriel | Keyword: Video Stabilizer, MacroVision Removal

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Touch Switch

Published:2012/12/11 0:32:00 Author:muriel | Keyword: Touch Switch

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Stepper Motor Controller

Published:2012/12/11 0:30:00 Author:muriel | Keyword: Stepper Motor, Controller

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Simple Two Speed Contactor DC Motor Controller

Published:2012/12/11 0:29:00 Author:muriel | Keyword: Simple , Two Speed Contactor, DC Motor, Controller

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Simple Touch Switch Circuit

Published:2012/12/11 0:28:00 Author:muriel | Keyword: Simple Touch, Switch Circuit

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Simple Servo Controller

Published:2012/12/11 0:28:00 Author:muriel | Keyword: Simple Servo, Controller

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Pulse Width Modulation DC Motor Control

Published:2012/12/11 0:26:00 Author:muriel | Keyword: Pulse Width, Modulation DC Motor, Control

Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor. While the latter approach works well, it generates heat and hence wastes power. This simple pulse width modulation DC motor control eliminates these problems. It controls the motor speed by driving the motor with short pulses. These pulses vary in duration to change the speed of the motor. The longer the pulses, the faster the motor turns, and vice versa.   (View)

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Pine Racecar Victory Judge

Published:2012/12/11 0:25:00 Author:muriel | Keyword: Pine Racecar Victory Judge

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Low Voltage Alarm

Published:2012/12/11 0:24:00 Author:muriel | Keyword: Low Voltage, Alarm

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Digital Keypad Combination Lock

Published:2012/12/11 0:23:00 Author:muriel | Keyword: Digital Keypad, Combination Lock

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AC Motor Speed Controller

Published:2012/12/11 0:22:00 Author:muriel | Keyword: AC Motor, Speed Controller

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IR Remote Switch Circuit

Published:2012/12/10 0:57:00 Author:muriel | Keyword: IR Remote , Switch Circuit

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12VDC Fluorescent Lamp Driver

Published:2012/12/10 0:48:00 Author:muriel | Keyword: 12VDC , Fluorescent Lamp Driver

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Automatic Headlight Brightness Switchs

Published:2012/12/10 0:46:00 Author:muriel | Keyword: Automatic , Headlight , Brightness Switchs

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DC motor servo control circuit diagram

Published:2012/12/10 0:11:00 Author:Ecco | Keyword: DC motor , servo control

In the circuit, when E, O are input DC voltage, the motor will be moved to a position corresponding with the voltage. The potentiometer connected to the same coaxially of motor is used as position feedback. When the given voltage is equal to 1k potentiometer wiper contact voltage, the differential amplifier output is zero, so the motor is stationary; Otherwise, the motor will be transferred or reversal according to the size of the signal.   (View)

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