Published:2011/10/18 21:57:00 Author:Ecco | Keyword: Emitter-coupled bistable , changingable action
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Published:2011/10/18 22:06:00 Author:Ecco | Keyword: Astable circuit , sub-file adjusting , pulse width
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Published:2011/12/7 20:51:00 Author:Ecco | Keyword: winding tap , T- connection , three-speed , single-phase motor
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Published:2011/12/7 20:53:00 Author:Ecco | Keyword: winding tap , connection , three-speed circuit , single-phase motor
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Published:2011/9/16 0:58:00 Author:Rebekka | Keyword: structure, ultrasonic sensor
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Published:2011/9/15 21:16:00 Author:Rebekka | Keyword: Monolithic automatic voltmeter
Overview:1. Low power consumption: We hope two ordinary button battery can be used for half an year.2. Low voltage: It does not use bulky batteries such as 5 # battery or tandem structure.3. High precision: It owns 31/2 or more precision.4. High stability: It requires a good reading stability.5. Low-cost: The cost of chip is lower than RMB10.00.6. Automatic: Fool-type operation.7. Monolithic: It does not use other active devices such as reference power and thermistor etc.That is these requirements produce the following design requirements.1. Use ordinary digital circuits manufacturing chip.2. Precision reference supply.3. Precision comparator.4. Precision Rectifier.5. 3V power supply.6. Working current is lower than 1MA.7. Analog / digital conversion.8. The least amount of external adjustment.
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Published:2011/9/27 20:56:00 Author:Rebekka | Keyword: Optocoupler level conversion
For different level conversion circuits, or input, output circuits , ifits levelneeds to be separated, it is more convenient to use optical couplers.Figures(a) and (b) circuits are 5V power supply TTL IC and 15V power supply HTL IC. Each circuit is connected and conducted level.
In figure (a), when TTL gate circuit turns on, it outputs low level, then the light-emitting diode turns on, phototransistor outputs high level; TTL gates close, then the light-emitting diode cuts off, phototransistor outputs low level. In figure (b),it uses TTL outputs high level, light-emitting diode turns on, photo transistor outputs low level; TTL conduction outputs low level, then LED isoff, and phototransistor outputs high level. (View)
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Published:2011/12/9 0:50:00 Author:Ecco | Keyword: JTAG emulator
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Published:2011/12/9 0:49:00 Author:Ecco | Keyword: CD-ROM interface , schematic
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Published:2011/12/9 0:49:00 Author:Ecco | Keyword: high-performance , multimeter
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Published:2011/12/8 20:43:00 Author:Ecco | Keyword: LCD digital thermometer
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Published:2011/12/8 20:51:00 Author:Ecco | Keyword: Adjustable , voltage-stabilizing circuit , current limiting, protection function
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Published:2011/12/8 20:20:00 Author:Ecco | Keyword: Memory , internal memory
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Published:2011/11/3 2:06:00 Author:Ecco | Keyword: Y-△ starting , motor , without power switch
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Published:2011/12/7 2:08:00 Author:Ecco | Keyword: Variable voltage, start-up circuit
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Published:2011/12/7 2:11:00 Author:Ecco | Keyword: Variable voltage , start-up
This starter is suitablefor 11 ~ 22kW motor.Because the current islarge,it uses three current transformers E to provide mutual inductance current.
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Published:2011/12/7 2:12:00 Author:Ecco | Keyword: Autoformer, step-down start
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Published:2011/12/7 2:06:00 Author:Ecco | Keyword: LOGO module , controlling , autotransformer , step-down start
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Published:2011/12/7 1:54:00 Author:Ecco | Keyword: Y-△ buck Starter
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Published:2011/12/6 1:49:00 Author:Ecco | Keyword: First-order , bypass filter
Design value Example :
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