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Index 38

Voice Control Music Doorbell Circuit

Published:2011/5/11 1:30:00 Author:Robert | Keyword: Voice Control, Music, Doorbell

This voice control music doorbell circuit uses two integrated circuit, a 3V battery to supply. Its static consumption current is about 100uA which would be tens of mA while playing the sound.The circuit's working principle is below:The circuit is shown in the picture below. NE555 is working in monostable mode. The trigger-port 2 foot's DC voltage is set a little higher than one third of Vdd. When there is door-knocking sound or other sound, TC would generate voltage to trigger NE555's 3 foot to output high voltage which has been inverted. Then it would trigger the music integrated circuit. So after the buffering in 9013 the music signal would drive the speaker to play music. When static, NE555's consumption current is just tens of mA, and other components' consumption current is just several uA.The debug method is shown below:This circuit is easily to install and needn't debugging in normal conditions. If the components are all good, the circuit would work by connecting these components. If the user wants to increase the sensitivity of voice control, he can adjust the partial voltage of the NE555's 2 foot and by changing this voltage it could achieve the goal. The nearer 2 foot's voltage is to the one third of Vdd, the more sensitivity the voice control has. But, if the sensitivity is too high, well the circuit would work if there is a little sound. Also the NE555's 2 foot's voltage can be a little various in different time and temperature which may cause the circuit going wrong or disable. (View)

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The Main Technology Parameter Circuit of Mazda Ignition System

Published:2011/5/11 0:49:00 Author:Borg | Keyword: Igniting Technology, Parameter

The Main Technology Parameter Circuit of Mazda Ignition System
(5) the main specifications of the ignition system(as shown in figure 4) (View)

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556 Touching Audio Circuit

Published:2011/5/10 7:55:00 Author:Robert | Keyword: Touching, Audio

The 556 Touching Audio Circuit is shown below. (View)

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The Alarm Indicator Lamp and Back-up Lamp Circuit of MAZDA 929

Published:2011/5/9 23:02:00 Author:Borg | Keyword: Alarm Indicator Lamp, Back-up Lamp

The Alarm Indicator Lamp and Back-up Lamp Circuit of MAZDA 929
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The Instrument and Alarm Lamp Circuit of MAZDA 929

Published:2011/5/9 23:07:00 Author:Borg | Keyword: Instrument, Alarm Lamp

The Instrument and Alarm Lamp Circuit of MAZDA 929
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The Power Supply, Starting and Ignition Circuit of Mazda 929

Published:2011/5/9 23:39:00 Author:Borg | Keyword: Power Supply, Ignition

The Power Supply, Starting and Ignition Circuit of Mazda 929
The outside size of Mazda 929 produced by Mazda Motor Corporation of Japan: 4700mm(length)*1690mm(width)*1420mm(height),4 passengers, curb weight:1160kg, total mass:1460kg. It is equiped with a four-stage carburettor petrel engine of FE type which is installed with water-cooling single overhead camshafts, which has a spherical combustion chamber, and the diameter of its air cylinder is 86mm, piston stroke 86mm,emmission 1998ml, compression ratio∑=8.6,maximum power of the engine 72kW/5600rpm, max Nm 156N.m/3700rpm and idle speed 800~85Orpm. 1. Circuit Diagram (View)

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The Brake Lamp,Speaker,Rear Defrost and Cooling Fan Principle Circuit of MAZDA 929

Published:2011/5/10 3:22:00 Author:Borg | Keyword: Brake Lamp, Loud Speaker, Rear Defrost, Cooling Fan

The Brake Lamp,Speaker,Rear Defrost and Cooling Fan Principle Circuit of MAZDA 929
(View)

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The Air-conditioning Principle Circuit of MAZDA 929

Published:2011/5/9 22:10:00 Author:Borg | Keyword: Air-conditioning, Principle Circuit, MAZDA 929

The Air-conditioning Principle Circuit of MAZDA 929

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The Clock,Steering and Danger Sinal Circuit of MAZDA 929

Published:2011/5/9 22:00:00 Author:Borg | Keyword: Clock, Steering, Danger Sinal

The Clock,Steering and Danger Sinal Circuit of MAZDA 929 (View)

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555 IC automatic battery charger circuit diagram(1)

Published:2011/5/9 20:38:00 Author:Ecco | Keyword: 555 , IC , automatic , battery charger

555 IC automatic battery charger circuit diagram(1)
Automatic nickel-cadmium battery charger circuit is shown as the chart, the charger is mainly composed of the power supply circuit, voltage comparator and indicating circuit. The power supply is stepped-down by the T transformer, rectified by diodes VD1 ~ VD4, stabilized by three-terminal voltage regulator Manifold A1 and filtered by capacitors C1, C2, then the circuit can output stable 9V DC voltage for the charger. Voltage comparator is composed of A2 time base circuit, and it has a Zener diode VS (stable voltage 5.6V) connected to pin 5 of the control side, so the reset level of the circuit will be located in the 5.6V. VL LED is the charging indicator. A1 selects LM7809 three-terminal voltage regulator Manifold, and it should be installed aluminum heat sink. VD1 ~ VD5 use IN4001 silicon rectifier diodes. VS selects 5.6V, 1/2W Zener diode, such as UZ-5.6B, IN5232. VL uses an ordinary red LED. RP selects 2W wirewound potentiometer, R1 ~ R4 are select 1/8W carbon film resistors. C1 selects CD11-25V aluminum electrolytic capacitor, C2, C3 are the CD11-16V aluminum electrolytic capacitors. S uses an ordinary small 1 × 1 power switch. T uses 220V/12V, 5VA small, high quality power transformer. (View)

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TMP87CH33N monolithic microcomputer integrated circuit diagram

Published:2011/5/9 1:08:00 Author:Ecco | Keyword: monolithic, microcomputer , integrated circuit

TMP87CH33N monolithic microcomputer integrated circuit diagram

TMP87CH33N is the single-chip microcomputer integrated circuit produced by Toshiba, it is widely used in Toshiba, Konka series of movement and assembly of large-screen color TV. TMP87CH33N integrated circuit uses the plastic package with 42 feet in double rows, the pin functions and signal flowing are shown in Figure 1, the pin letter code and data are listed in Table 1. (View)