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Index 214

TDA1521 practical making miniature amplifier circuit

Published:2011-5-25 19:10:00 Author:Christina | Keyword: practical making, miniature, amplifier

TDA1521 practical making miniature amplifier circuit
Figure: TDA1521 practical making miniature amplifier circuit   (View)

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The oscillator circuit with the independent adjustable charging and discharging time

Published:2011-5-25 19:03:00 Author:Christina | Keyword: oscillator, circuit, independent adjustable, charging, discharging, time

The oscillator circuit with the independent adjustable charging and discharging time
As the figure shows, the adjustment of common 555 multivibrator's charging and discharging time will influence each other. This circuit uses the mirror current source mode to keep the independence of the capacitance C's charging loop and discharging loop, and this circuit ensures the linearity of the charging and discharging. At the beginning, the output is the high level, VT5, VT2 and VT1 conduct, C is charged by VT1's constant-current, when VT1 has the 2/3VDD threshold level, 555 sets, pin-3 has the low level, and VT5 cuts off. C is discharged by the VT3 and IC's discharging tube, when the voltage of C is 1/3VDD, 555 sets. This cycle goes round and round to form the oscillation.   (View)

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1m laser length measuring machine stripe counter preamplifier circuit

Published:2011-5-30 3:37:00 Author:Christina | Keyword: 1m, laser, length, measuring, stripe counter, preamplifier

1m laser length measuring machine stripe counter preamplifier circuit
The figure a shows the circuit with the 200 amplification factor, the bandwidth is 0 to 100KHZ, and it can be used in the preamplification of the 1m laser length measuring machine stripe counter. The figure b shows the circuit with the 50 amplification factor, the bandwidth is 0~200KHZ, the phase difference of the two photocells output signal is 180°, and it is amplified by the 5G922. This circuit can be used in the preamplification of the grating moore stripe subdivision circuit.   (View)

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ocl power amplifier circuit

Published:2011-5-30 3:29:00 Author:Christina | Keyword: ocl, power amplifier

ocl power amplifier circuit
Figure: ocl power amplifier circuit   (View)

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Antenna booster circuit with the mix-amplification mode

Published:2011-5-30 2:31:00 Author:Christina | Keyword: Antenna, booster, mix-amplification

Antenna booster circuit with the mix-amplification mode
The antenna booster circuit with the mix-amplification mode is as shown. The working principle is the same as the amplification-mix mode. Figure: Antenna booster circuit with the mix-amplification mode   (View)

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multistage amplifier circuit

Published:2011-5-30 2:16:00 Author:Christina | Keyword: multistage, amplifier circuit

multistage amplifier circuit
1. Coupling modes of the multistage amplifier circuit In practice we always use three kinds of coupling modes: the resistance capacitance coupling, the direct coupling and the transformer coupling. (1). Resistance capacitance coupling It's connection method: connect the preamplifier output to the rear-amplifier output through the resistance and the capacitance. It's features: the quiescent operating points of the stages are independent and easy to adjust. It's weak point: can not amplify and change the slow signal and do not easy to integrate. The figure 1 shows the resistance capacitance coupling connection. (2). Direct coupling In order to avoid the influence of the capacitance to the slowly changing signal, we connect the two stages of amplifier circuits together, this is the direct coupling. It's features: it can amplify the AC signal and the DC signal, easy to integrate, but it has the zero drift phenomenon. Figure: multistage amplifier circuit   (View)

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Instrument Amplifier (INA101) Circuit With Eliminating AC Noise

Published:2011-5-19 8:10:00 Author:Robert | Keyword: Instrument Amplifier, Eliminating, AC, Noise

Instrument Amplifier (INA101) Circuit With Eliminating AC Noise
The instrument amplifier (INA101) circuit with eliminating AC noise is shown in the picture below. The amplification stage A1, A2 in the picture are chosen to use the integrated amplifier INA101, and the back stage A3 is chosen to use INA105. Also it uses the INA105 to make up the circuit like the feedbacl connection. So this would limit the power's AC noise.   (View)

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INA166 Low-Noise Low-Distortion Instrument Amplifier Pin Circuit

Published:2011-5-21 21:22:00 Author:Robert | Keyword: Low-Noise, Low-Distortion, Instrument, Amplifier, Pin

INA166 Low-Noise Low-Distortion Instrument Amplifier Pin Circuit
The INA166 is a low-noise, low-distortion instrument amplifier. The design of current feedback circuit makes it have a wide bandwidth and excellent dynamic response in a wide gain rang. The INA166 can be used in amplification of weak signals, such as miniature microphone (mike) and the amplification of underwater sound measurement device.Many industrial, instrument and medical applications also profit from its low noise and wide bandwidth. And its special distortion elimination circuit can reduce the distortion to very low level. With 200Ω source resistance the INA166 provides the low-noise performance which is almost close to the theoretical value.   (View)

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input protection with optoelectronic isolator circuit

Published:2011-5-29 7:11:00 Author:chopper | Keyword: optoelectronic isolator, input protection

input protection with optoelectronic isolator circuit
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

Analog isolation circuit
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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The optoelectronic isolation circuit between TTL and relay

Published:2011-5-28 0:43:00 Author:chopper | Keyword: TTL, relay, optoelectronic isolation circuit

The optoelectronic isolation circuit between TTL and relay
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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the Integral reset circuit of improved I

Published:2011-5-30 7:14:00 Author:Ariel Wang | Keyword: Integral, reset, improved I

the Integral reset circuit of improved I
the Integral reset circuit of improved I
the Integral reset circuit of improved I
the Integral reset circuit of improved I
the Integral reset circuit of improved I

From below we can see that the time constant of discharge circuit usually far less than of charge circuit.At this time,the unreliable phenomenon of power on reset caused by switch on and off can be controlled . As the time constant of discharge is too short,it reduces the insensitiveness of voltage fluctuation to power-supply when the reset circuit is at work.   (View)

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the circuit of hardware in SD1077 singlechip system

Published:2011-5-29 23:15:00 Author:Ariel Wang | Keyword: hardware, singlechip system

the circuit of hardware in SD1077 singlechip system
The circuit of hardware in SD1077 singlechip system is as the chart below:   (View)

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the reset circuit of MAX706P

Published:2011-5-29 23:15:00 Author:Ariel Wang | Keyword: reset

the reset circuit of MAX706P
The reset circuit of MAX706P is as the chart below:   (View)

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the circuit of static digital display

Published:2011-5-29 23:17:00 Author:Ariel Wang | Keyword: static , digital, display

the circuit of static digital display
It can be divided into static display and dynamic display as there are two ways of display.Here what we talked about is static display.It is two-bits static digital display.Its main function is displaying the serial number of LED light which is on.If L1 light is on,digital tube will display 11.If L2 is on,digital tube will display 22,ect.The design of the circuit is composed of two 8-bits shift register (74HC164), two 8-sections LEB digital tube( Common anode) and two 8×330Ω exclusion .   (View)

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the joint circuit of ADS7805 and TMS320F206

Published:2011-5-29 23:18:00 Author:Ariel Wang | Keyword: joint

the joint circuit of ADS7805 and TMS320F206
The 16-bit fixed point DSP TMS320F206 of T1 company is low power device.It adopts improved Harvard structure .It has one procedure base line,3 data base lines,assembly lines and so on.When TMS320F206 externally connects the 16MHZ crystal oscillator ,and the control mode of working clock is ×1,you can connect /CS pin to DSP's /RD signal pin.But in order to reduce the controlling line,you can reduce /CS's pin to low level .You can connect R/C's pin to /RD's signal pin and you can connct R/C's pin to DSP expanding output port.But /BUSY signal can only be connected to common input port.For example,DSP's IO port,expanding chip 74LS244's input port,ect.   (View)

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the joint circuit of DSP and 8237

Published:2011-5-29 23:19:00 Author:Ariel Wang | Keyword: joint, DSP

the joint circuit of DSP and 8237
the joint circuit of DSP and 8237

The circuit as the chart below provides DMA service signal from 4 channels' peripheral demands.And 8237 has AEN pin.It can satisfy all requests of chart 1.So it reallizes the interface between DSP and the sound card.In actual work,we based on the situation of usage of the sound card in PC to set up whether 8237's DREQ1 or DACK1 can be the play passage,whether 8237's DREQ3 or DACK3 can be the collecting passage,whether the break application signal IRQ7 goes through GAL16V8 becoming reversed with DSP'spin or not.   (View)

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the AD9850 circuit

Published:2011-5-29 23:30:00 Author:Ariel Wang | Keyword: circuit

the AD9850 circuit
The AD9850 circuit is as the chart below:   (View)

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the independent oscillator divider circuit of watchdog delicated chip TPS3823

Published:2011-5-30 10:29:00 Author:Ariel Wang | Keyword: independent, oscillator divider , watchdog, delicated chip

the independent oscillator divider circuit of watchdog delicated chip TPS3823
①Because the clock of the watchdog is dependent,the counting clock and the system belong to the same frequency division link.The watchdog won't operate effectively when the system have some problems.②The clock can use software to set up.When the setting up is failed,the clock may fail as well. Without clock,watchdog can't work well.③Some watchdog need software to set up and start.So when the start fails and initialization unactivated,CPU might jump to random code.It may stop the watchdog.Theoretically,the design has the unreasonable part.Based on the analysis above,we adopt off chip watchdog using dedicated chip TPS3823.The experimental circuit is seen as below:   (View)

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the reset circuit of improved comparator

Published:2011-5-28 18:22:00 Author:Ariel Wang | Keyword: reset, improved, comparator

the reset circuit of improved comparator
The reset circuit of improved comparator is as the chart below:   (View)

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