Published:2011/5/30 3:13:00 Author:Christina | Keyword: Amoi, DVD, power supply
The 8156 type Amoi DVD power supply circuit is as shown:
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Published:2011/5/30 5:10:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/30 5:09:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/30 5:08:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/29 21:43:00 Author:chopper | Keyword: fast summing amplifier, low input current
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Published:2011/5/29 7:39:00 Author:chopper | Keyword: quad operational amplifier
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Published:2011/5/29 7:37:00 Author:chopper | Keyword: optical coupling, V/F converter
This circuit can convert 0~10V input voltage into corresponding frequency from the output end of optoisolator.When Convertor RM4151 and quad operational amplifier use together, they will has a high linearity.Quad operational amplifier,integraph,voltage regulator and LED driver.
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Published:2011/5/29 7:25:00 Author:chopper | Keyword: 4W, switch-type, 5V, regulated DC power supply
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Published:2011/5/29 7:11:00 Author:chopper | Keyword: optoelectronic isolator, input protection
This circuit combines diode and transistor together.When the input voltage is between 3 and 30V,the incoming current of LED of the optoelectronic isolator MOC3011 is limited to a secure ultimate value that is less than 15mA.If the polarity is set reversely by accident,this circuit can also protect the LED.
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Published:2011/5/29 22:07:00 Author:chopper | Keyword: Analog, isolation
This circuit is a FM transmission system which uses light as media.The transmitter uses 565 phase-locked loop as voltage controlled oscillator,making the LED of optoelectronic isolator flash at a rate that is proportional to input voltage.The driving amplifier of photoduodiode is of enough gain to add 200mV(peak-peak) signal to the input end of recipient 565.Recipient 565 is acted as a frequency modulation detector and reproduces the signal which is imported to the transmitter.The power source is between ±6 and ±12V.
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Published:2011/5/29 7:26:00 Author:chopper | Keyword: operational amplifier
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Published:2011/5/28 0:43:00 Author:chopper | Keyword: TTL, relay, optoelectronic isolation circuit
In this circuit,it uses photocoupler to make the circuit between TTL and relay gain the isolation of 100GΩ,and eliminates the effect to TTL circuit from noise of relay as well as spike voltage.When the input signal of TTL is high,Q1 is conducted,and LED has no current.And there is no light incidenting to detectors.At this time,photoelectric diode has the bigest resistance value of 5GΩ.Therefore,Q2 is inconductive,so is Q3.Thus,no current passes through the coil of relay.
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Published:2011/5/20 5:36:00 Author:chopper | Keyword: Optical electronic, potentiometer
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Published:2011/5/28 0:54:00 Author:chopper | Keyword: difference amplifier
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Published:2011/5/28 0:51:00 Author:chopper | Keyword: crystal diode, internal
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Published:2011/5/28 0:27:00 Author:chopper | Keyword: four-Stage Amplifier
Four-Stage Amplifier circuit ,14 pins dual-in-line package filter is shown as follows.Active band-pass filter circuit is shown as follows:
Spectrum analyzer of acoustics uses this circuit as band-pass filter to select different signals from different frequency ranges,and indicates the scope of signals by using the amount of dots on a monitor lighted by LED.The circuit is shown as follows:
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Published:2011/5/28 0:57:00 Author:chopper | Keyword: main control panel, air conditioning
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Published:2011/5/21 7:25:00 Author:TaoXi | Keyword: simple, light controller
As the figure 17-38 shows, this circuit uses the 555 as the core, and the RS trigger circuit is composed of the 555, the photosensitive tube (3DU type) and the RP. At night, the resistance between 3DU tube's c electrode and e electrode is so large, pin-2's potential closes to the ground potential, 555 sets, pin-3 has the high level voltage, and the light turns on; during the day, there is the illumination, so the resistance between 3DU tube's c electrode and e electrode reduces, pin-6's voltage exceeds the threshold level 2/3VDD, 555 resets, the light turns off.
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Published:2011/5/28 21:24:00 Author:Borg | Keyword: multi-functional ceiling fan
The fan control method is classified into three ways that are direct, interval and timing. In the interval state, 555,R2,R3,RP1,C2,R7,C3 and so on consists a non-steady multi-resonate oscillator, before the charging voltage reaches the trigger LEV(2/3VDD), the 3-pin of 555 is in a high LEV, VT1 is conducting, the relay J pulls in, the fan gets power and starts to run, the running time is determined by R2,R3,RP1 and C2, in the figure, the corresponding time to the parameters is around 25~60s. The interval time means the period after 555 is reset, and C2 discharges(with the help of R7) to the the trigger LEV of 2-pin(1/3VDD), the time span corresponding to the parameter in the figure is about 20s. (View)
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Published:2011/5/21 1:39:00 Author:Robert | Keyword: Electric Energy, Metering System, Single-Phase
The electric energy metering system simplified circuit is shown in the picture below which is made up by AD7551 and the 89C51 MCU. C1~C4 are +5V power decoupling capacitor. The R-nor port is connected with the UDD through a pull-up resistance R1 to make the R-nor port be 1 and the reset port disabled. The 3.679545MHz crystal and capacitor C5, C6 are made up oscillation circuit to provide the timing signals to AD7751. C7 is the denoising capacitor of Uref(i/o) port.
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