Circuit Diagram

8156 type Amoi DVD power supply circuit

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:   (View)

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crystal diode DDZX9713T internal circuit

Published:2011/5/30 5:10:00 Author:chopper | Keyword: crystal diode, internal

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crystal diode DDZX9714T internal circuit

Published:2011/5/30 5:09:00 Author:chopper | Keyword: crystal diode, internal

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crystal diode DDZX9715TS internal circuit

Published:2011/5/30 5:08:00 Author:chopper | Keyword: crystal diode, internal

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fast summing amplifier with low input current circuit

Published:2011/5/29 21:43:00 Author:chopper | Keyword: fast summing amplifier, low input current

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LF347/LF147 quad operational amplifier circuit

Published:2011/5/29 7:39:00 Author:chopper | Keyword: quad operational amplifier

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optical coupling V/F converter circuit

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.   (View)

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4W switch-type 5V regulated DC power supply circuit

Published:2011/5/29 7:25:00 Author:chopper | Keyword: 4W, switch-type, 5V, regulated DC power supply

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input protection with optoelectronic isolator circuit

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.   (View)

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Analog isolation circuit

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.   (View)

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F4558 operational amplifier circuit

Published:2011/5/29 7:26:00 Author:chopper | Keyword: operational amplifier

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The optoelectronic isolation circuit between TTL and relay

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.   (View)

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Optical electronic potentiometer circuit

Published:2011/5/20 5:36:00 Author:chopper | Keyword: Optical electronic, potentiometer

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difference amplifier circuit

Published:2011/5/28 0:54:00 Author:chopper | Keyword: difference amplifier

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crystal diode DDZX9699TS internal circuit

Published:2011/5/28 0:51:00 Author:chopper | Keyword: crystal diode, internal

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LM324 four-Stage Amplifier circuit

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:   (View)

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PIC16C54 main control panel of air conditioning circuit

Published:2011/5/28 0:57:00 Author:chopper | Keyword: main control panel, air conditioning

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555 simple light controller circuit

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.   (View)

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The 555 multi-functional ceiling fan controller circuit

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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Electric Energy Metering System Simplified (Single-Phase Electric Energy Metering System AD7551) Circuit

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.   (View)

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