Circuit Diagram

BA4558 single power supply universal dual op amp circuit diagram

Published:2011/8/4 20:52:00 Author:Rebekka | Keyword: single power supply universal, dual op amp circuit

BA4558 is high-performance dual operational amplifier. It does not need to connect frequency compensation components. The features of the circuit are: Short circuit protection, zero offset voltage capability, low power consumption, non-blocking phenomenon, difference module and common module input voltage range. Its similar or direct substitution models are: AN45588, CA1458E, CF158MT, CF258LT, CF358CT, HAl7558PC, LA6458, LMl58, tzPC4558C and so on. The typical application circuit is shown as above.   (View)

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Op amp zeroing circuit diagram

Published:2011/8/4 21:23:00 Author:Rebekka | Keyword: Op amp zeroing

Precision op amp without changing the drift of the offset nulling circuit is shown in Figure (a) and (b). Figure (a) is low-drift precision op amp. Figure (b) is the zero offset adder circuit. According to the figure (b), when R4 = RF2, Av2 = 1, thatis the follower. Figure (a), if R1 = R2 = 1kΩ, R3 = RF1 = 1MΩ, then Vol = R3 / (R2 + R3) · (1 + RFl / Rl) · Vi2-RFl/Rl · Vil. Al's voltage gain is obviously great, so its output voltage will contain the A1 offset voltage.   (View)

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High-performance quadrature sine wave type oscillator circuit

Published:2011/8/6 7:54:00 Author:nelly | Keyword: High-performance, quadrature, sine wave type, oscillator

Many RC oscillators use the advanced circuits in the phase shift unit. They use the voltage feedback amplifier, and the gain of the voltage feedback amplifier will reduce sharply in the high frequency, and gain will stop, when it has not reached the high frequency. The difference of the voltage feedback amplifier phase characteristic is the reason. The high frequency IC HA5025, which contains four current feedback amplifiers, is used to make the RC oscillator, thus four quadrature sine waves will be formed, as shown in the picture.   (View)

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Op amp zero method circuit diagram

Published:2011/8/4 20:55:00 Author:Rebekka | Keyword: Op amp, zero method

The high-resolution zero circuit is shown as above. It can adjust the 100 ~ 200μV offset voltage to l ~ 2μV. R3 in the circuit isthe high multi-turn ceramic trimmer potentiometer with high resistance. The potentiometeris connected tothe internal resistor of amplifier(typically around 1 ~ 10kΩ) in parallel.Resistors R. And R: They are the l% precision metal film resistors,which can provide the required resolution and range. The resistance range is 2 ~ 10MΩ. For some integrated operational amplifiers,it doesn't need external R1 and R2 to minimize the noise.   (View)

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CFl4753 single and dual power high input impedance quad op amp circuit diagram

Published:2011/8/4 20:58:00 Author:Rebekka | Keyword: high input impedance, single power , quad op amp, dual power

CF14753 is CMOS operational amplifier, containing 4 units high-performance op amp。 It is exactly the same with foreign model MC14753. It isset internal phase compensation and mainly used for a variety of analog computing circuits, AC amplifier, low-frequency waveform generator and the active filter. It also can be composed of chopping and auto-zero operational amplifier. Its similar or direct substitutions models are: CFl4573, 5G14573, MCl4573, CHl4573, CAl4573 and so on. The typical application circuit is shown as above.   (View)

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Digital sine wave generator circuit

Published:2011/8/7 8:45:00 Author:nelly | Keyword: Digital, sine wave, generator

The picture shows the digital sine wave generator. It is composed of analog-digital converter (4018B) and a fixed filter (MAX29X). One part of the clock pulse, which inputs the CP, drives the filter MAX29X. The other part of the clock pulse is divided by the 10-digit counter (4018B), and then it is divided by the second counter. The output step wave will change to the smooth sine wave by R5 and C1, and then it is output by the filter. The output frequency of the circuit will change with the clock input, the relationship is fout=fin/l00。   (View)

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High-precision linear amplifier circuit composed of F007

Published:2011/8/4 20:59:00 Author:Rebekka | Keyword: linear amplifier

High-precision linear amplifier circuit is used for sensing signal detection. It is shown as above. The high-precision linear amplifier circuit is composed of three parts, electric bridge, op amp amplifiers Al and supply amplifier A2 and A3. The output value of A2 and A3 are equal, the phases are contrast, its size depends on the reference voltage VR and the output voltage Vo. The (1 + δ)R4 in the bridge shows the resistance change value of the temperature sensor. The linear distortion of the circuit is not more than 0.5%, it can be used for the temperature measurement interface of the air data processing system, it can be used as the non-power measurement of pressure, speed, flow etc.   (View)

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4kHz harmonic generator circuit

Published:2011/8/7 4:40:00 Author:nelly | Keyword: harmonic generator

The harmonic generator has the differential type. Through the output transformer, the two rectangular pulses, which have half circle difference, are coupled by the symmetrical differential amplifier circuit. Thus the harmonic generator circuit can be achieved. It is simple, and easy to maintenance. It also has the low cost and saves the characteristics of symmetrical pulse. The performance can be closed to the magnetic saturation type. The 4 kHz harmonic generator is as shown in the picture. Its generating frequency is mainly controlled by the main oscillator. Odd and even harmonics can be used for the presetting, access and road base of the communication machine, and it also can be used for the carrier frequency and pilot frequency of the modulation.   (View)

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Dual high and low temperature limit controller circuit diagram

Published:2011/8/4 20:42:00 Author:Rebekka | Keyword: Dual high temperature , limit controller, Dual low temperature

The circuit is composed of a D flip-flop of the dual D CD4013 flip-flop. The structure is simple with the feature of high and low temperature control. The control temperature can be preset by the potentiometer, when the temperature is more than the preset temperature, the power will be automatically cut off. It can be used for the industrial heating processing equipments. The constitution of circuit is shown as above. D flip-flop in the circuit will be connected to a RS flip-flop. It uses thermistor MF51 used by industrial control as temperature sensors.   (View)

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1024kHz and 4kHz sine wave output circuit

Published:2011/8/7 1:54:00 Author:nelly | Keyword: sine wave, output

This SJT circuit is the 1024kHz warming crystal oscillator. The principle of this circuit is as shown, because the output signal is low, the follow-up transistor VT1 is used to buffer and amplify. The base of VT1 offsets resistor R2, carrier resistor R3. Emitter resistor R4 is the negative feedback resistor, which is used to stabilize the DC working point of VT1. The zener diode VD1, VD2 and capacitor c1 form the regulator and filter circuit. The regulator and filter circuit is used to reduce crystal SJT’s influence caused by supply voltage.   (View)

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The overcurrent protection of DC circuit diagram

Published:2011/8/4 20:45:00 Author:Rebekka | Keyword: DC circuit, overcurrent protection

Electronic protection circuit is shown in the figure. When the micro switch K is connected to the power supply, the one-way thyristor SCR and the DC circuit will be turned on. When the power consumption excees the the allowable value, the voltage of the sense resistor R1 is greater than 0.7V, the transistor BG is turned on,the voltagebetween collector C and base b of the transistor drops belowthe sustaining voltage of 3CT. 3CT will be turned off and the power supply circuit will be cut off. Electronic protection circuit has a high-speed drying, easy recovery characteristics. It can be applied to any DC circuit for overcurrent protection equipment.   (View)

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BTL power amplifier circuit compoed of LF4100

Published:2011/8/4 20:46:00 Author:Rebekka | Keyword: BTL power amplifier

LF4100, 4101 and 4102 are mainly used for tape recorders, amplifiers and other electronic equipment of audio power amplifier. The device has a wide frequency response, high fidelity, high stability and the feature of easy to adjust stc. BTL power amplifier circuit composed of LF4100, 4101 and 4102 is shown as above.   (View)

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Isolated electric bridge measurement amplifier circuit composed of INA102

Published:2011/8/4 20:50:00 Author:Rebekka | Keyword: Isolated electric bridge , measurement amplifier

The isolated electric bridge measurement amplifier circuit is composed of ISO102 and low-noise low-power INA102, whichis widely used in industrial process control, andit is shown as above. ISO102 is the buffer capacitor coupled isolation amplifier, the gain of the INA102 is 1000,and itmain amplifies 300Ωbridge signal. Bridge power supply is composed of two parts: One part is l4mA current provided by the supply side (INA102 12 feet) passing the 680Ω resistor; Another part is 2.7mA current provided by the +5 V reference from the ISO102 incentive. The 2 parts supply 16.7mA to the electric bridge.   (View)

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Mixed circuit applied to the signal distribution

Published:2011/8/7 5:17:00 Author:Sophia | Keyword: Mixed circuit, signal distribution

In the high-frequency circuits, signal distribution using the hybrid circuit is shown in the figure. The so-called hybrid circuit is to achieve the coupling between specific points, while the other points are insulated. Here, it is a experiment against the hybrid circuit among A, B, C, let C → A and C → B signal pass, A → B and B → A will be separated.To simply speaking, in this circuit, A and B will not interfere in each other, and form coupled circuit with C point together. In the hybrid circuit a dual winding coil is used. Here FT-82-43 (25T × 2) is used as experiment. If the surrounding impedance setting is not correct, effective separation will not be acheived.   (View)

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CF1458 series dual power supply general-purpose dual op amp circuit diagram

Published:2011/8/4 20:57:00 Author:Rebekka | Keyword: dual power supply, general-purpose , dual op amp

CF1458 series op amps are high-performance dual op amps. Its electrical properties and /-A747 are the same, buttheir pin arrangement is different. The series features are: No external frequency compensation components, short circuit protection and it has the ability to offset voltage to zero. There is a wide differential mode and common mode input voltage range, low power consumption, the use will not becongested. Substitution models of similar or directly are CF1558MT, CF1458CT, CF1558NMT, CF1458NCT, CF1558SMT, CF1458SCT, CF1558MD, CFl458CD, CFl558MJ, CFl458cJ, CFl458CP, CFl558NMD, Fl458NCD, CFl558SMJ, CFl458SCJ, CFl458SCP, CFl558SMD and so on.   (View)

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12kHz signal generator circuit

Published:2011/8/6 22:21:00 Author:nelly | Keyword: signal generator

The 12kHz signal generator as shown is composed of crystal oscillator and alarm circuit. The output amplitude of the oscillator is stable, change <±0.26dB. Component selection: transistor VTl, VT3: 9014,65 ≤ β ≤ 115; VT2, VT4: 3DGl308, 60 ≤ β ≤ 85. Thermistor RT: RRWl-2 type. Quartz crystal SJT: BE42-12kHz. Transformer T applies the ferrite MXD-2000, and the magnetic core is GV36X22. Ll-2Φ0.17mm high strength wire, wound 27 turns, L3-4Φ0.17mm high strength wire, wound 37 turns. The LED VD3 can be any type.   (View)

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E-Insurance circuit diagram

Published:2011/8/4 20:30:00 Author:Rebekka | Keyword: E-Insurance

The circuitis suitable for the DC power supply overcurrent protection, such as a variety of battery-powered applications. If the load current exceeds a preset value, the insurance will disconnect the DC electronic load. When you reset the circuit, you just need to cut the power off. The circuit has two connection points (A, B tag), the load can be connected to either side. Load current flows through the transistor T4, resistor R10 and R11. A, B terminals' voltage and load current are proportional to the majority of the voltage distribution in the resistor.   (View)

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12kHz IF signal generator circuit

Published:2011/8/6 21:33:00 Author:nelly | Keyword: IF, signal generator

As shown in the picture, the circuit is composed of the IF oscillator and alarm circuit. It applies the variable feedback oscillator circuit, and the oscillator frequency is mainly determined by the quartz crystal. C1 and C2 can be used as the fine turning frequency. Oscillating pipe uses the composite pipe to improve the input impedance, and the stability of the magnitude is achieved by the VD1 and VD2 two-way regulation. Specifications: (1) Nominal frequency: 12kHz, and the frequency difference does not exceed ± 1Hz; (2) Frequency Accuracy: in the temperature range of 25±25℃, and ΔF does not exceed ± lHz; (3) U01 output level: -28dB/600Ω, deviation is less than ± 0.2dB;   (View)

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The battery protector with voltage charging circuit composed of 555

Published:2011/8/4 20:32:00 Author:Rebekka | Keyword: battery protector , voltage charging circuit

Discharge protection circuit consists of IC2 (555) and BG2, BG3, BG4 and so on. When the battery discharges to 10.5V, the regulators DW1, DW4 are regulatedto make BG2, BG4 stop. IC2 is reset becausepin ②, ⑥ are in high level; pin③ outputs low so BG3 stops. The release of relay J2 and the contact of J2-2 off (down) achieve the discharge protection. When the battery voltage is greater than 11.5V, IC2 sets, BG3 conducts, J2 pulls in, the load starts to work. When a load short circuit occurs, IC2 resets because pin ④ isin a low level. J2 releases. The short-circuit protection works.   (View)

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DC regulated power supply protection circuit composed of 555

Published:2011/8/4 20:38:00 Author:Rebekka | Keyword: DC regulated, power supply protection

Monostable delay circuit is composed of the IC2 (555), R3, C4 and other components. Usually, J1-1 NC contact closes, the load makes IC2 ④ feet in a high potential (1V above), when the load is short circuit, 555 feet will be forced to reset because the ④ (<0.6V) level is low. ③ pin output high level to release the relay J. Contact J1-1 is connected. If it is still short circuit, it will be protected.   (View)

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