Published:2012/12/10 0:53:00 Author:muriel | Keyword: Electronic Dice Circuits
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Published:2012/12/10 0:52:00 Author:muriel | Keyword: Colour (Sound) Organ
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Published:2012/12/10 0:51:00 Author:muriel | Keyword: Black Light
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Published:2012/12/10 0:51:00 Author:muriel | Keyword: Adjustable, Strobe Light
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Published:2012/12/10 0:50:00 Author:muriel | Keyword: 40W , Fluorescent Lamp, Inverter
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Published:2012/12/10 0:49:00 Author:muriel | Keyword: 3 Channel, Spectrum Analyzers
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Published:2012/12/10 0:48:00 Author:muriel | Keyword: 12VDC , Fluorescent Lamp Driver
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Published:2012/12/10 0:47:00 Author:muriel | Keyword: Simple , Parallel (Printer) Port, Interface
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Published:2012/12/10 0:47:00 Author:muriel | Keyword: Computer Controlled , Frequency Counter/Logic Probe
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Published:2012/12/10 0:46:00 Author:muriel | Keyword: Automatic , Headlight , Brightness Switchs
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Published:2012/12/10 0:45:00 Author:muriel | Keyword: Car Alarm Arming, Horn Beep Canceller
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Published:2012/12/10 0:44:00 Author:muriel | Keyword: Wireless, Auto Tachometer
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Published:2012/12/10 0:41:00 Author:muriel | Keyword: EMF, Field Intensity Meter
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Published:2012/12/10 0:40:00 Author:muriel | Keyword: Three , Frequency Crystal Marker
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Published:2012/12/10 0:40:00 Author:muriel | Keyword: Phasing Exciter, 75 Meter SSB
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Published:2012/12/10 0:12:00 Author:Ecco | Keyword: 200MHz, broadband amplifier , low noise
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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.
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Published:2012/12/10 0:29:00 Author:Ecco | Keyword: Digital Responder , timing
According to the difficulty degree of the grab answer, the host will set the time to answer the question, and the counter is set by preset by preset time circuit, and the counter clock pulse is provided by the second pulse circuit. The preset time circuit is designed by decimal synchronization addition and subtraction counter 74LS192 circuit, and the specific circuit is shown as the figure.
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Published:2012/12/10 0:21:00 Author:Ecco | Keyword: Optical isolation , transmission linearity, improving
It uses negative feedback techniquesto greatly improve the transmission photocoupler linearity.
In figure (a), D1 is in the feedback path, the current flowing D1 has the linear relationship with Vi. The disadvantage of this circuit is not taken into account the non-linear relationship between the current transfer ratio of optocoupler devices and operating current. Therefore, the deviced must be carefully selected.
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Published:2012/12/10 0:15:00 Author:Ecco | Keyword: Microcomputer, data acquisition system
Microcomputer data acquisition system composed of AD570, AD1408 and microprocessor CPU8155 circuit is shown as the figure. The measuring circuit has eight channels, each channel has sequential measurements, the scanning of each channel does not exceed 50μs, the system logic levels use TTL, binary code, data transmission way.
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