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Control Circuit

Index 41

Tone Control circuit

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

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

Alarm circuit diagram using 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

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

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

Video Stabilizer/MacroVision Removal
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Touch Switch

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

Touch Switch
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Stepper Motor Controller

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

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

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

Simple Touch Switch Circuit
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Simple Servo Controller

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

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

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

Pine Racecar Victory Judge
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Low Voltage Alarm

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

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

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

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

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

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

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

DC motor servo control circuit diagram
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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Simple Electronic Keyer

Published:2012-12-6 19:45:00 Author:muriel | Keyword: Simple Electronic Keyer

Simple Electronic Keyer
A simple keyer suitable for a popcorn QRP transmitter can be built around an astable multivibrator and an example of such is shown above. The basic design of this keyer is from notes, however the original author of the circuit is unknown. The notes were written in 1973 . I modernized the circuit, added a variable speed control and designed an additional output driver stage. Keying this circuit generates either dits and spaces or dahs and spaces. When the keyer is idle, Q1 is on and Q2 and Q3 are switched off. When the user sends code, Q1 turns off and Q2 and Q3 switch on and in turn key any device appropriately connected to the collector of Q3. The off-time of Q1 sets the on-time of Q2 and Q3. The off-time of Q2 and Q3 is set by the 22K Q2 base resistor. This off-time is the set time of the spaces and is constant. The 68K resistor on the base of Q1 is about three times the resistance of the 22K base resistor on Q2 and consequently dahs are ~ three times the length in duration than dits. Spaces and dits are of the same length of time because when sending dits, the 68K base resistor is paralleled with the 33K resistor and effectively the resistance is ~22K ohms. If the optional relay driver transistor Q4 is used instead of Q3, the theory is the same, just substitute Q4 wherever you see Q3.   (View)

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