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automatic motor starting circuit with Doppler-effect sensor RD9481

Published:2011/6/30 11:06:00 Author:John | Keyword: Doppler-effect sensor, motor

automatic motor starting circuit with Doppler-effect sensor RD9481

The circuit is just as shown. It includes the Doppler -effect sensor control circuit, thyristor control circuit, music sound output circuit, large circuit and AC buck rectifier circuit and so on. Doppler-effect sensor IC RD9481 is the core device of the circuit, whose internal functional block circuit is also shown. (View)

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The vehicle loudspeaker circuit

Published:2011/6/30 5:02:00 Author:Seven | Keyword: vehicle loudspeaker

In the figure is the vehicle loudspeaker circuit. The left side of the figured dotted line is the loudspeaker circuit of the former car, SI is the key of the loudspeaker on the steering wheel. S2 is the added single-pole double-throw switch, which is used in the shift of the electric loudspeaker and the audio loudspeaker in the former car. The the switch S is at the position of 2 , by pressing the switch SI, the capacitor Cl is charged, the triodes of VT1 and VT2 are conducting, the relay JI is pulling in, and the normally open connector J1-1 is closed and offers power to the circuit for 15s. IC1 is the specialized audio integrated circuit HL-169, whose working time is 2.8s. (View)

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Southeast Soveran 4G64 engine electronic control system circuit

Published:2011/6/30 10:53:00 Author:John | Keyword: engine, electronic control system

Southeast Soveran 4G64 engine electronic control system circuit
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Piezoelectric high level automatic control and alarming circuit

Published:2011/6/30 10:51:00 Author:John | Keyword: automatic control

Piezoelectric high level automatic control and alarming circuit
The shown circuit consists of the piezoelectric material level sensor, relay control mechanical circuit, analog voice circuit and AC buck rectifier circuit. When the material level rises to the high material level, the circuit can be issued for a given analog sound and also cut off the power supply of the feeding equipment. Then the feeding process stops in order to ensure safe operation. IC1 is a piezoelectric material level sensing circuit, which consists of self-excited oscillator, rectifier circuit, voltage comparator circuit and output stage of the open circuit. (View)

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MAX1894/MAX1924 typical application circuit without pre-charging function

Published:2011/6/30 10:44:00 Author:John | Keyword: pre-charging function, typical application

MAX1894/MAX1924 typical application circuit without pre-charging function
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Southeast Soveran body attachment circuit

Published:2011/6/30 10:34:00 Author:John | Keyword: body attachment

Southeast Soveran body attachment circuit
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The RC trigger single-way thyristor dimmer circuit

Published:2011/6/30 3:54:00 Author:Seven | Keyword: RC trigger, single-way thyristor, dimmer

The RC trigger single-way thyristor dimmer circuit
In the figure is the single-way thyristor dimmer circuit whose trigger circuit is composed of RC elements, the 220v AC is rectified by VD1～VD4 and becomes a DC impulse voltage, and then it is added between the positive pole and passive pole of the thyristor VT. RP, R and C2 compose the trigger circuit, the DC pulse voltage is charging C2 through RP and R, when it reaches a certain value, the thyristor VT is open and the bulb E is glowing because of getting power. When the impulse voltage between the two poles of of VT is over zero, VT is broken down automatically, and the power supply charges C2 through RP and R again. (View)

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Audi charging system circuit

Published:2011/6/30 10:32:00 Author:John | Keyword: charging system

Audi charging system circuit
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Audi (front drive) anti-lock braking circuit

Published:2011/6/30 10:34:00 Author:John | Keyword: anti-lock

Audi (front drive) anti-lock braking circuit
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Optical linear detection circuit

Published:2011/6/30 10:33:00 Author:John | Keyword: linear detection

Optical linear detection circuit
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Southeast Soveran power window and sunroof window circuit

Published:2011/6/30 10:32:00 Author:John | Keyword: power window, sunroof window

Southeast Soveran power window and sunroof window circuit
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The auto open/close curtain controller circuit

Published:2011/6/30 3:31:00 Author:Seven | Keyword: curtain controller

The auto open/close curtain controller circuit
This controller can recognize the brightness in the room automatically, which can control the curtain and make the natural light in the optimum state. In figure 1, the LDR RD and the time-based circuit 5G1555 compose the brightness recognition sector. The LDR RD receives the natural light and its resistance changes, which is set as RD1, at the moment, RD1 is falling down. The elements and their parameters are shown as follows: BG1：3DG12，BG2：3CG14，BG3：3DG12，BG4：3DG12B。D1～D3：2CP，D4～D7：2CP14，DW：2CW22C/100mA/7.5V。W1、W2：100K，RD：the LDR of the 625 type. (View)

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Audi gated light basic circuit

Published:2011/6/30 10:30:00 Author:John | Keyword: gated light

Audi gated light basic circuit
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Southeast Soveran automatic transmission circuit

Published:2011/6/30 10:29:00 Author:John | Keyword: automatic transmission

Southeast Soveran automatic transmission circuit
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Audi interior light circuit

Published:2011/6/30 10:28:00 Author:John | Keyword: interior light

Audi interior light circuit
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Southeast Lioncel automatic transmission, ABS, airbag and anti-theft system schematic

Published:2011/6/30 10:28:00 Author:John | Keyword: automatic transmission, ABS, airbag, anti-theft system

Southeast Lioncel automatic transmission, ABS, airbag and anti-theft system schematic
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The self-made fast hand drier circuit

Published:2011/6/30 3:43:00 Author:Seven | Keyword: fast hand drier

45. The self-made fast hand drier circuitThe drier will blow out warm air if the washed hand is below it, and when the hand becomes dry, it will stop automatically, see as figure 2. When there is light, the 1-pin of the IC is in a low LEV, TWH8751 is blocked, J is power-off, J1-1 is broken down. When the hand is blocking the light, D2 is in a high resistance, the 2-pin of IC is in a low LEV, so the output terminal of IC is conducting, J1-1 is passable, the heating wire and motor get power, so the warm air is blown out. The power supply of the control wire is stepped down and rectified by the 36K resistor and 2CP12, then the voltage of 18V or so is acquired. (View)