Circuit Diagram

Energy-efficient motorcycle regulating rectifier circuit

Published:2011/5/23 21:30:00 Author:John | Keyword: motorcycle regulating rectifier

Motorcycles are generally powered by magneto of the car. Output voltage of Magneto is regulated by regulating rectifier to supply electric appliances on the car and to charge the battery. At present, parallel switching regulating rectifier are widely used in many domestic motorcycles, just shown in Figure 1. The device takes effects when the output voltage of magneto is over the rated voltage. The device takes effects when the output voltage of magneto is over the rated voltage. The thyristor rectifier SCR1 and SCR2 inside of SCR rectifier voltage regulator opens to clip the output voltage of magneto, achieving the voltage regulation.   (View)

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Pulse current limiting battery charger circuit

Published:2011/6/4 12:10:00 Author:John | Keyword: battery charger

Pulse current limiting battery charger circuit is shown below.   (View)

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Transformer feedback oscillator circuit

Published:2011/6/4 11:18:00 Author:John | Keyword: Transformer, oscillator

The easiest way to introduce positive feedback is to use transformer feedback method, just as shown in the figure. Replace the input voltage of the feedback voltage. And transformer feedback oscillator circuit is achieved. Circuit Analysis: ★ Observe the circuit to find that there are amplifier, frequency selective network, positive feedback network and amplitude part achieved by nonlinear characteristics of used transistors;★ Determine whether amplifier circuit is normal or not. Amplification circuit shown in the circuit is the typical operating point stabilizing circuit, which can be used to set the appropriate static operating point; ★ Exchange pathway shown in the figure indicates that there is no open or short circuit during the signal exchanging process. And the circuit can be amplified normally;★ Use instantaneous polarity method to determine whether the circuit is able to meet equilibrium conditions or not (specific approach).   (View)

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Yilaida electric bicycle battery charger circuit

Published:2011/6/4 11:36:00 Author:John | Keyword: electric bicycle, battery charger

Yilaida electric bicycle battery charger circuit is shown below.   (View)

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Field-effect transistor US5U1、US5U2、US5U3 internal circuit

Published:2011/6/4 11:38:00 Author:John | Keyword: Field-effect transistor

Field-effect transistor US5U1、US5U2、US5U3 internal circuit is shown below.   (View)

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Capacitor feedback oscillator improved circuit

Published:2011/6/4 11:53:00 Author:John | Keyword: Capacitor, feedback oscillator

To increase the frequency of capacitor feedback oscillator circuit, it is necessary to reduce capacitance of C1 and C2 and L’s inductance. In fact, when capacitance of C1 and C2 is reduced to a certain extent, capacitor within transistor and the stray capacitors in the circuit will be incorporated into C1 and C2. Thus, the oscillator frequency can be affected. These capacitors are equivalent to input capacitor Ci and output capacitor Co in amplification circuit. The improved circuit and equivalent electrical device are shown below. Due to critical effect on capacitance by temperature and unsteady stray capacitors, it is necessary to serially set a capacitor C3 with small capacitance in the inductor branch circuit in order to stabilize the oscillation frequency. And C3 < <C1 and C3<<C2.   (View)

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Field-effect transistor UPES120P internal circuit

Published:2011/6/4 11:54:00 Author:John | Keyword: Field-effect transistor

Field-effect transistor UPES120P internal circuit is shown below.   (View)

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adjustable frequency selection network circuit

Published:2011/6/4 12:08:00 Author:John | Keyword: selection network

Output voltage of the capacitor feedback oscillator circuit has a good waveform. But if the oscillation frequency is adjusted by changing the capacitance, the feedback factors and the starting conditions for the circuit would be affected. And it is rather difficult to adjust the oscillation frequency by changing the inductance method. It is generally used occasions within a fixed oscillation frequency. When oscillation frequency is adjustable within a not wide range, the circuit as shown in the right figure can be used as a frequency selection network circuit.   (View)

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The LEV tester circuit of the resistor set high/low electric detecting threshold

Published:2011/6/7 1:57:00 Author:qqtang | Keyword: LEV tester, detecting threshold

In the figure is the LEV tester circuit of the resistor(R1~R4) set high/low electric detecting threshold. The threshold voltage can be calculated by voltage distributing formula, when the value is adapted by R1~R4, the LEV threshold of 9-pin is 2.5v, the LEV threshold of 5-pin is 0.8v. When UIN≤0.8V, 7-pin outputs a high LEV, TV is conducting, the it indicates 0 ; when UIN≥2.3V, 8-pin outputs a high LEV, and it indicates 1 , the decimal dp is glowing; when UIN inputs a clock pulse, it indicates a 0 with points; when UIN is in 0.8V～2.3V, both 7 and 8 output low LEV.   (View)

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TC9028AF-023--the integrated circuit of the remote emitter

Published:2011/6/7 1:43:00 Author:qqtang | Keyword: integrated circuit, remote emitter

TC9028AF-023 is the integrated circuit of the remote emitter produced by Toshiba, which is widely used in the remote control system of large screen color TV.1.function featuresTC9028AF-023 contains clock oscillator circuit, reset circuit, key scanning encode circuit and other additional circuit.2.pin functions and dataTC9028AF-023 is in 20-pin dual line plastic package, whose pin functions and data are listed in Table 1.Notes:in the 2-pin and 3-pin of TC9028AF-023, the oscillator circuit and the external pottery resonator form a clock oscillator circuit.   (View)

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Lamp inrush current suppression circuit

Published:2011/6/4 12:23:00 Author:John

Inrush current is the main reason for failure of the lamp. The circuit can be used to limit such current. But when the filament reaches normal operating temperature, it can provide the lamp with a normal current. This circuit also applies to low pressure pilot lights. But as long as the voltage and current is no more than certain ratings of the transistor, any kind of light bulb can be used.   (View)

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Field-effect transistor UM5K1N internal circuit

Published:2011/6/4 12:24:00 Author:John | Keyword: Field-effect transistor

Field-effect transistor UM5K1N internal circuit is shown below.   (View)

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High input impedance instrumentation amplifier circuit

Published:2011/6/4 12:25:00 Author:John | Keyword: instrumentation amplifier

High input impedance instrumentation amplifier circuit is just as shown below.   (View)

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Field-effect transistor STG3P3M25N60 internal circuit

Published:2011/6/4 12:26:00 Author:John | Keyword: Field-effect transistor

Field-effect transistor STG3P3M25N60 internal circuit is shown below.   (View)

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differential-input instrumentation amplifier

Published:2011/6/4 13:11:00 Author:John | Keyword: instrumentation amplifier

Differential-input instrumentation amplifier is just as shown below.   (View)

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four-divider frequency circuit

Published:2011/6/5 2:52:00 Author:John | Keyword: four-divider frequency

Figure: four-divider frequency circuit Double T network RC sinusoidal oscillator circuit is shown in Figure 12-5. Disconnect the dual-T network to adjust the quiescent point of T1 pipe. And the UC1 is 6 ~ 7V. Access dual-T network and use the oscilloscope to observe the output waveform. If it does not start-up, adjust RW1 to start-up the circuit. Measure the oscillation frequency of the circuit and compare it with the calculated value.   (View)

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Hex counter circuit

Published:2011/6/5 3:16:00 Author:John | Keyword: Hex counter

The number of two or more required to connect with cascaded 74LS90 chip. When the low chip reaches the full count, the highest point of the low chip low would be regarded as binary. And such would be sent to the CP end of a high chip. Figure: Hex counter circuit   (View)

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TC901--the integrated circuit of fan single chip microcomputer

Published:2011/6/7 11:08:00 Author:qqtang | Keyword: integrated circuit, single chip microcomputer

TC901 is a microcomputer integrated circuit of fan single chip produced by Toshiba, which is widely used in speed adjusting and power adjusting of all kinds of fans and household appliances.1.function featuresTC901 includes order decoding circuits, clock circuits, indicator drive circuitS, wind speed adjusting circuits and so on.2.pin functionsTC901 is in 16-pin dual in-line package, whose pin functions are shown in Figure 1.Figure 1. The pin functions of TC901 3.typical application circuitFigure 1. The typical application circuit of TC901   (View)

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cotton machine controlling photoelectric control circuit

Published:2011/6/4 4:14:00 Author:John | Keyword: cotton machine

When the phototransistor T1 is illuminated, low resistance shows. At this time, the electric potential of point A drops and 3AX31 conducts. The relay sucks to control the cotton machine. Capacitor of 200μF and resistor of 3 KΩ form the charging circuit, ensuring that electric potential of point A would not increase rapidly in the absence of light. The circuit plays the role of delaying and avoids the relay working too often. Resistor of 120Ω is the current feedback resistor, aiming to stabilize the operating point of 3AX31. 2CP2 is used to protect 3AX31.   (View)

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The logic probe circuit with display function

Published:2011/6/8 2:02:00 Author:qqtang | Keyword: logic probe circuit, display function

The logic probe circuit with display functionThe circuit is shown in the circuit, it consists of a 6-backward phaser integrated circuit CD4069 and LED digit displayer. The NANDs of 1,2 and 3 form a Schmidt trigger as the logic probe, which is used to measure the logic LEV directly. The Schmidt trigger circuit is fixed with two threshold LEV, by adjusting R, we can change the LEV values of the two thresholds, so that we can judge the logic LEV of the circuit under test. The NANDs of 3,4 and 5 form a decoding circuit of strokes.   (View)

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