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Index 7

555 Dual astable multivibrator circuit

Published:2011/9/18 21:46:00 Author:Ecco | Keyword: 555, Dual , astable , multivibrator

555 Dual astable multivibrator circuit
As shown in Figure 3-17, the circuit has two synchronized multivibrators whichare composed of 556 dual time-base circuit, andit can output two clock pulse signals simultaneously, the spacing and oscillation frequency can be changed by adjusting the time constant. When you select C1 = C2 = C, f = 0.91 / (R1 + R2) C, duty cycle depends on the value of R1 and R2 and it can be up to 5% to 95%. (View)

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Audi Cruise Control circuit

Published:2011/9/14 21:02:00 Author:John | Keyword: Cruise Control

Audi Cruise Control circuit
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Toy model sign indication circuit

Published:2011/9/12 21:17:00 Author:John | Keyword: Toy model sign indication

Toy model sign indication circuit

The circuit is generally set in a variety of junctions or corners, aiming to indicate the direction for the toy train or car. The main direction is to rely on its successive group of light-emitting diodes, as shown. IC14017 is the decimal count splitter, which has five output named Q0~Q4 while only 4 is used to form the quaternary count distributor. N1~N5 are 5 Schmitt triggers. N1 is the oscillator to provide IC1’s clock source. N2 ~ N5 5 are 4 monostable triggers. T1~T4 are the drive circuit for light-emitting diode. (View)

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NISSAN new Teana audio (with navigation system) circuit(e)

Published:2011/9/12 22:00:00 Author:John | Keyword: navigation system, new Teana audio

NISSAN new Teana audio (with navigation system) circuit is shown. (View)

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Nokia 7xxx Mobile Schematic Diagram 07

Published:2011/9/4 7:31:00 Author:Joyce | Keyword: Mobile, Schematic

Nokia 7xxx Mobile Schematic Diagram 07
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Economical Fluorescence Display Circuit Composed of 555

Published:2011/9/4 7:31:00 Author:Joyce | Keyword: Economical, Fluorescence , Display

As shown in the figure is an economical fluorescence display circuit. The core of the circuit is a multivibrator composed of 555 ,R1, R2,and C1 ect, whose oscillation frequency is: f = 1.44 / (R1 + 2 R2)C1, the frequency of the corresponding parameters in the figure above being about 4 kHz. DC bias of the filament in the figure is : VDD ·R4/ (R3 + R4) ≈ 6 V. Adding a dc voltage of 6 V and an nkHz ac voltage whose Vp-p voltage is about 4 V to the filament of the fluorescent character-display tube on the calculator would make the fluorescent character display tube display. The structure of the circuit is simple thus it is easy to make. (View)

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Tremolo amplifier circuit

Published:2011/9/9 2:24:00 Author:John | Keyword: Tremolo amplifier

Tremolo amplifier circuit
The amplifier utilizes undersonic frequency (usually 5 ~ 15Hz) to do amplitude modulation for the audio input signal. The used National's LM389 IC contains three transistors and a power amplifier in the internal array. These transistors constitute the differential pair and active current source tail end. The differential amplifier output is proportional with two input signals’ product. Gain control potentiometer is used to adjust the desired tremolo intensity. R, C network within levels constitute the 160Hz high-pass filter and the tremolo frequency is required below 160Hz. (View)

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VG095 FOG

Published:2011/9/9 3:30:00 Author:John | Keyword: Fiber Optic Gyro, Gyro, FOG, angular velocity sensor, VG gyro, gyro Russia

VG095 FOG
Fiber optic gyroscope VG095M is a micro-precision sensor, which is based on VG941-3AM. It improves bias value and scale factor stability. And it responses the angular rate of moving objects in the form of the voltage. The symbols of the output voltage depend on the rotating direction around the sensitive axis. weight 80 gram size 25 x 35 x60mm power consumption 1 Watt bias stability 15 deg/h proportionality factor 10 mV/deg/s Scale factor stability 0.1 % random walk 0.1 deg/ sqrt h measuring range 300 deg/s bandwidth 0...450 Hz working temperature -30°C ... +70°C Storage temperature - 55°C … +85°C vibration 6 g (RMS), 20Hz... 2000Hz attack 90 g, 1 ms (View)

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555 Water level-controlled Circuit

Published:2011/9/3 10:40:00 Author:Zoey | Keyword: Water level-controlled

555 Water level-controlled Circuit

As shown in the picture 24-24, the controlling circuit is composed of 555 and a music IC circuit. This circuit is used to control the conductive liquid. 1,2,3, and 4 refer to four pins. When the liquid level goes down and Pin 3 is exposed, Pin 2 of IC1will bein low level(＜1/3VDD), 555 will set and J will close, and solenoid valve will get electrical power and begin to work and infuse water to the container. Meanwhile, IC2 will be triggered and play music to inform people to infuse water. When water levelreachespin 2, water resistance between pin 1 and pin 2 will make the level of pin 6 higher than 2/3VDD, then 555 will reset, pin 3 will be in low level, J willrelease, and solenoid valve will cut off electric power and water supply. Pin 4 is an insurance needle, when water level reaches pin 4, VT1 will conduct and be in low level, forcing 555 to reset and cut off the solenoid valve. (View)

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Circuit of a 555 Multi-vibrator with a changeable tone

Published:2011/9/3 10:38:00 Author:Zoey | Keyword: 555 Multi-vibrator, a changeable tone

Circuit of a 555 Multi-vibrator with a changeable tone

This transposition circuit is composed of two time-based 555 circuit, it can emit continuous oscillation wave that ranges from 400~2500 Hz, similar to the sound of police wagon. This circuit consists of time-lapse oscillator, low-frequency oscillator and modem audio generator; the circuit can be seen in the picture3-21. The gating switch HG is magnet-controlled and it remains open usually. When IC1 ceases to be reposited and starts to oscillate, the oscillation frequency is fc=1.44/(R2+2R3)C2 The charge and discharge time of C2 is 3.94s and 0.06s respectively. Output wave of C2 is sawtooth voltage wave, which controls the oscillation frequency conversely. The multi-vibrator is composed of IC2,R4, R5 and C3, with its frequency can be changed. Its basic oscillation frequency is about 1000Hz, and its actual oscillation frequency changes as sawtooth voltage wave change. The oscillation square wave will be magnified through VT2, and then drive the speaker to make an alarm that sounds like the police wagon. The circuit can be used in burglarproof system and circuit of various toys, the prolonged time of start-up can be adjusted according to the time takes for housemasters to enter the house. For example, it takes longer time for old people to enter the house, so we can prolong the time by enlarging the time constant of R1C1. (View)

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The regulator: DC-DC circuit, power supply monitor pin and its main features LM105

Published:2011/8/28 1:16:00 Author:Seven | Keyword: DC-DC circuit, power supply, monitor pin

The regulator: DC-DC circuit, power supply monitor pin and its main features LM105
LM105/205/305/305A/376--the adjustable stabilizer (positive output)This a positive output stabilizer whose output voltage is adjustable; the output voltage range is 4.5~40V; the output current is 45mA; the wave impedance ratio is 0.01%/V; the max voltage of LM105/205/305A is 50V, the max voltage of LM305/376 is 40V, the power consumption of LM376 is 400mW, the rest is 800mW; the working temperature is LM105 is -55~+125℃; the working temperature is LM205 is -25~+85℃, that of LM305/305A/376 is 0~75℃. (View)

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Nokia 7xxx Mobile Schematic Diagram 03

Published:2011/8/12 3:10:00 Author:Joyce | Keyword: Mobile , Schematic

Nokia 7xxx Mobile Schematic Diagram 03 (View)

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Over-voltage Instruction Circuit Composed of 555

Published:2011/8/12 3:03:00 Author:Joyce | Keyword: Over-voltage , Instruction, 555

As shown in the figure is an over-voltage instruction circuit, which is composed of multivibrator, detection circuit, and LED (light-emitting diode) etc. The multivibrator constitutes of 555, R1, W1 and C1 ect, and it is connected with the collector of the triode and grounding feet 1 of 555. When the monitored voltage exceeds the set value ,the stabilivolt DW will be punctured to break over detector tube BG1.The multivibrator starts oscillation for the connection of power circuit, and the oscillation signal output will drive the LED to flash. Breakdown voltage of stabilivolt DW and the resistance of current limiting resistance R3 can be chosen according to the voltage to be monitored. (View)