Circuit Diagram

PGA202/203 circuit based on the numerical control gain programming instrument amplifier

Published:2011/7/1 1:11:00 Author:TaoXi | Keyword: numerical control, gain, programming instrument, amplifier

The PGA202/203 circuit based on the numerical control gain programming instrument amplifier is as shown in the figure:   (View)

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Low power consumption program-controlled gain amplifier circuit

Published:2011/7/1 1:14:00 Author:TaoXi | Keyword: Low power consumption, program-controlled, gain, amplifier circuit

The Low power consumption program-controlled gain amplifier circuit is as shown in the figure:   (View)

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Independent charger composed of the LP3945

Published:2011/7/1 1:16:00 Author:TaoXi | Keyword: Independent charger

  (View)

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Digital programmable amplifier circuit

Published:2011/7/1 1:18:00 Author:TaoXi | Keyword: Digital, programmable amplifier

The Digital programmable amplifier circuit is as shown in the figure:   (View)

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Vizi saloon car ABS and brake light circuit

Published:2011/7/1 1:20:00 Author:TaoXi | Keyword: Vizi, saloon car, ABS, brake light

The Vizi saloon car ABS and brake light circuit is as shown in the figure:   (View)

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Vizi saloon car internal light, cigar lighter and remote control rearview mirror circuit

Published:2011/7/1 1:21:00 Author:TaoXi | Keyword: Vizi, saloon car, internal light, cigar lighter, remote control, rearview mirror

The Vizi saloon car internal light, cigar lighter and remote control rearview mirror circuit is as shown in the figure:   (View)

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MAX846A typical application circuit

Published:2011/7/1 1:23:00 Author:TaoXi | Keyword: typical application

  (View)

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Vizi tail light and lighting circuit

Published:2011/7/1 1:24:00 Author:TaoXi | Keyword: Vizi, tail light, lighting circuit

The Vizi tail light and lighting circuit is as shown in the figure:   (View)

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CD4001 single channel modulator circuit

Published:2011/7/1 0:41:00 Author:chopper | Keyword: single channel, modulator circuit

  (View)

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Panda 3643 infrared remote-control emitter circuit

Published:2011/7/1 0:42:00 Author:chopper | Keyword: Panda, infrared remote-control, emitter circuit

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positive-negative double supply circuit

Published:2011/6/28 6:31:00 Author:chopper | Keyword: positive-negative, double supply circuit

The picture is a positive-negative double supply circuit which is usually adopted in the analog circuit.It is a power sipply circuit formed by tapped full-wave rectification and three terminal regulator.The ground of smoothing capacity C1,C2 and regulator is connected to A point on the tapped landline of transfer. Point A is a reference potential.The supply output will not be effected by the smoothing current of C1 and C2.   (View)

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down-lead of high frequency circuit

Published:2011/6/27 9:30:00 Author:chopper | Keyword: down-lead, high frequency circuit

In the high frequency circuit,the inductance and capacitance of the down-lead effect circuit a lot and the supply lead is very important.We should reduce the impedance of landlines as possible as we can in the high frequency range.As for high frequency circuit, it includes landlines basically besides element lines and signal lines.Thus,all parts of the groud of the circuit can be connected by any routes and the impedance among the groud is very low.The picture a,b are printed plate wiring examples of single pipe broadband amplifier circuit.We can know there are all landlines besides down-leads.   (View)

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example of A/D and D/A converter circuit

Published:2011/6/27 10:00:00 Author:chopper | Keyword: example, A/D and D/A, converter

The picture is the typical instance of digital analog circuit,and it is a A/D and D/A converter circuit.The A/D and D/A integrated chip is on the edge of the digital circuit and analog circuit.Thus,these chips include AGND and DGND,and there is no current going through the ground,the leads need not too thick.   (View)

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landlines of digital and analog circuit on the same placode circuit

Published:2011/6/27 10:13:00 Author:chopper | Keyword: landlines, digital and analog circuit, same placode

When the digital circuit and analog circuit are on the same placode,the trend of the landlines is very important to prevent the noise of digital circuit from mixing into the analog circuit to effect its performance.The digital circuit and analog circuit must be separated physically if they are on the same circuit,because the analog ground AGND and digial ground DGND should be separated definitely.AGND and DGND should be connected at one point,just as picture a,b.   (View)

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power supply and landlines of digital circuit

Published:2011/6/27 21:07:00 Author:chopper | Keyword: power supply, landlines, digital circuit

As to digital circuit,the impedance of power supply should be low as possible as we can.The high impedance will effect the circuit.The picture is a connection method of double-sided printed circuit board.On the element installation surface there are horizontal and longitudinal leads,and leads should be short and thick as possible as we can.Additionally,the leads are in grid shape to reduce the circuit impedance when the frequency is high.The waxy capacitance of power supply can reduce the high frequency impedance of leads of power supply.Thus,every IC is connected with a 0.1μF ceramic capacitor.To reduce the low frequency impedance of leads of power supply,we can add a 100μF electrolytic capacitor to the input end of power supply.   (View)

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one point connetion method of amplification circuit

Published:2011/6/27 22:15:00 Author:chopper | Keyword: one point connetion method, circuit

Thus,it needs one point connetion method.The so-called one point connetion means the reference potentials of every part are the same.The picture a,b is the one point connetion method.As the picture (a),the ground of input end and amplifier is connected to the ground of power supply by one line.Therefore,all return current is circulated between the input signal ground and the amplifier.If among the benchmark ground there is a wiring resistor RC,it will generate noise and hum.   (View)

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landlines of low frequency circuit

Published:2011/6/27 21:59:00 Author:chopper | Keyword: landlines, low frequency circuit

In the low frequency circuit,different grounding methods will effect a lot to the circuit performance when deal with the weak level signal.The picture a,b are the grounding methods of amplifier circuit.The picture (a) is a inverse amplification circuit,and it takes the same phase input terminal of operational amplifier as benchmark by connecting it to ground through resistor to amplify.The picture(b) is a in phase amplification circuit and it takes the inverse input end of operational amplifier as benchmark by connecting it to ground through resistor to amplify.   (View)

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Limited current circuit with transistor

Published:2011/6/27 21:44:00 Author:chopper | Keyword: Limited current circuit, transistor

The picture is a limited current circuit with operational amplifier.In the circuit,R9 and R10 are used to detect output current.When the voltage drop is more than 0.6V,VT1 and VT2 will stop to cut off current.In this case,the current of VT3 and VT4 is limited within 400mA.   (View)

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10W audio power amplification circuit of μPC1238

Published:2011/6/22 20:45:00 Author:chopper | Keyword: 10W, audio power, amplification

The picture shows a 10W audio power amplification circuit.This circuit adopts integrated power amplifier μPCI238 as the amplifying device.The input signal is added to the in-phase input end(pin 1) of operational amplifier through coupling capacitance(capacity is lμF) and resistor(resistance is 56kΩ).Between the output end (pin 4) and inverting input end(pin 2) is a feedback resistor R1 whose value is 56Ω,and between the inverting input end and groud are resistor R2 whose value is 1KΩ and a 22μF capacitor.The voltage amplification times of the circuit is:Av=(1+R1／R2)≈(1+56／1)=57   (View)

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NE556 automatic monitoring circuit of starting battery of dynamo

Published:2011/6/20 6:22:00 Author:chopper | Keyword: automatic monitoring, starting battery, dynamo

This is a automatic monitoring circuit of starting battery of dynamo,and it can detect the voltage state of storage battery continuously.When the battery discharges to the prescriptive lowest voltage,it will stop charging automatically;when the battery needs a charger but the charge power supply is not available,it can distinguish automatically and send out a acoustic signal to remind operating staff of power supply.In addition,it has a function of automatic-manually operation convertion,which makes it charge the battery at any time manually.   (View)

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