Published:2011/4/6 20:40:00 Author:Rebekka | Keyword: switch lights device , circuit and oscillogram
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Published:2011/4/6 20:59:00 Author:Rebekka | Keyword: automatic control Lamp , Bulletin board Lamp
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Published:2011/4/6 1:08:00 Author:Rebekka | Keyword: Long-range infrared remote
The circuit consists of infrared, infrared receiver and the implementation circuits.
IR emitter is shown as below:
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Published:2011/4/6 1:13:00 Author:Rebekka | Keyword: Infrared sensor , music outlet control
Circuit is shown as below. It includes pyroelectric infrared sensor, infrared sensor specific integrated control circuit, relay control circuit, the music for the voice circuit and 9V power supply. (View)
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Published:2011/4/6 0:59:00 Author:Rebekka | Keyword: ultrasonic probe
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Published:2011/4/6 1:00:00 Author:Rebekka | Keyword: eyesight protector
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Published:2011/4/10 21:43:00 Author:may | Keyword: passive, non , loss buffer, DC/AC half bridge converter
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Published:2011/4/10 21:39:00 Author:may | Keyword: working model, passive, non loss, buffer
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Published:2011/4/10 21:38:00 Author:may | Keyword: working model, passive, non loss, buffer
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Published:2011/4/6 1:03:00 Author:Rebekka | Keyword: Ultrasonic sensor, electrical property
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Published:2011/4/10 21:28:00 Author:may | Keyword: application
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Published:2011/4/6 21:02:00 Author:Rebekka | Keyword: UCM type, sonac technical data
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Published:2011/4/10 21:30:00 Author:may
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Published:2011/4/10 21:31:00 Author:may
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Published:2011/4/10 21:33:00 Author:may | Keyword: Delta alternate type
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Published:2011/4/10 21:37:00 Author:may | Keyword: passive, non loss, buffer
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Published:2011/4/7 22:10:00 Author:may | Keyword: static switch
The usage of static switch: it can parallel normal work only when two AC power supply has the same frequency, amplitude. When one AC power supply go wrong, will generate restoring current between the two power supply, thereby make changes of output voltage in two parallel power supply, it will influence the reliable of power supply. The usage of static switch is cut the error power supply to output, and accomplish unbroken switchover between inverter output and commercial power bypass output. We mostly adopts high-speed relay as switching device, because its switching time only has 2ms~5ms, is fit for the requirement of communication equipment needing power supply without interruption. In the case of UPS power supply with capacity above 2KVA, because the increase of relay working current, its switching time will add to 80ms~120ms, and sparkle generated in the moment relay snapping will cause high temperature to damage the contact point, or voltaic arc generated between normal open and normal close contact point will short circuit the two AC power supply in a moment, so relay using for switching is only limit to low capacity UPS power supply, but its switching time has tens seconds. (View)
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Published:2011/4/6 21:04:00 Author:Rebekka | Keyword: T/R40 type sonac, shape and size
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Published:2011/4/6 1:04:00 Author:Rebekka | Keyword: Ultrasonic sensor , frequency features
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Published:2011/4/6 21:56:00 Author:Rebekka | Keyword: Human body induction, Alarm circuit
The alarm circuit is a alarm device that makes use of the distributed capacitance of the human body and to work. The multivibrator type oscillator composed of BG1, L1, C1 works but the relay does not before a human body access the alarm; When a human body access the alarm, the periodic circuit will stop work and the alarm will work because of the capacitance of human body. (View)
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