Published:2011/4/22 5:12:00 Author:Robert | Keyword: Application
TEA2107 application circuitis shown above. (View)
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Published:2011/4/24 10:06:00 Author:Christina | Keyword: Light intensity, control switch
When the light intensity is 10-25lx, The bulb's frequency of flashing is 1.5Hz. At this point this circuit works as the multivibrator. When the light intensity is over 25lx, resistance of the photosensitive resistor become lower, transistor T2 turns on, the light turns off. The circuit close the transistor T1 by diode BA127.
To let the multivibrator work under small illumination, we must parallel a fine-tuning resistance at both ends of the photoresistor to limit the resistance increase rate.
Main technical data:
The light intensity and voltage when the circuit shut down:
when UB=4V, light intensity is 45lx
when UB=5V, light intensity is 25lx
when UB=6V, light intensity is 15lx
Lamp voltage: 2V to 4V
Current consumption (100lx): <10mA
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Published:2011/4/25 3:55:00 Author:Ecco | Keyword: refrigerator, temperature, telling circuit
Refrigerator temperature telling circuit is shown as the chart. The circuit consists of step-down circuit, temperature sensing elements Rt, integrated operational amplifier LM324, IC SL322-level display and so on. Buck rectifier circuit provides DC voltage for the entire circuit; Rt is the thermal resistor, SL322 is used to drive light emitting diodes. When the refrigerator temperature increases, the resistance of Rt decrease, the corresponding Vi1 declines, it is amplified by LM324, the voltage Vo rises, Vo is directly sent into the SL322 to drive light emitting diodes, and the input voltage rises due to SL322, the number of lit LEDs increases. Conversely, when the refrigerator temperature is lowered, the number of lit LEDs declines. Determining the temperature of light-emitting diode, the number of lit LEDs can tell the temperature inside the refrigerator. The circuit shown as the chart only has one lit light when at 0 ℃, 10 LED lights at 18 ℃, the average change every 2 ℃ will cause l LED being lit or off. If you want to lower the temperature and more lit LEDs, R3 and R4 may be changed the positions.
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Published:2011/4/24 21:16:00 Author:Ecco | Keyword: DIY information , SIMMAX , GSM mobile phone
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Published:2011/4/24 20:48:00 Author:Christina | Keyword: Op Amp, High-performance Amplifier
Conventional op amp drive amplifier' power is difficult to expand because of the limit of op amp voltage. This power amplifier uses the Voltage switching current mode to drive the tube amplifier directly, so the output power depends on final amplifier tube and amplifier power, and the speaker has no on / off shock noise. The whole device does not add any compensation capacitor, so the phase shift is small. And this device uses the op amp as the constant current amplifier, so we can change different op amps easily, there are more choices of Timbre.
The op amp uses the ne5532 or ad827 dual op amp, t1, t2 use the medium power transistor 2sb647, 2sd667, and the final amplifier tube are the sanken tube 2sc2922, 2sa1216 or 2sc3281, 2sa1302, and the resistance uses the 1/4w metal film resistor.
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Published:2011/4/23 3:11:00 Author:Robert | Keyword: Eye Protechtion
Eye Protechtion Circuit is shown below:
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Published:2011/4/23 3:13:00 Author:Robert | Keyword: Rocket Launcher, Simulation
Rocket Launcher Simulation Circuit is shown as below:
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Published:2011/4/23 3:35:00 Author:Robert | Keyword: Car, Anti-Collision, Untrasonic Wave
Car Anti-Collision Untrasonic Wave Circuit is shown below:
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Published:2011/4/23 9:58:00 Author:Robert | Keyword: Ultrasonic Wave, Anti-Theft, Alarm, Detector
Ultrasonic Wave Anti-Theft Alarm Detector Circuit is shown below:
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Published:2011/4/21 20:15:00 Author:Robert | Keyword: Core Field Scanning, Pincushion Correction
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Published:2011/4/21 9:48:00 Author:Christina | Keyword: Solenoid, Switch Circuit
When the switch teleprinter is inductive load, the optical isolator provides the protection relay between the teleprinter and 8080A or other microprocessors. The RC filter which across the darlington transistor accelerates the reset speed of print magnet.
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Published:2011/4/21 4:23:00 Author:Nicole | Keyword: microprocessor, electric typewriter
This circuit is a model circuit, it adopts fiber optic cable and some cheaper components and it is used in the occasions with narrow frequency band, it feeds the microprocessor with singal of forane electric typewriter. (View)
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Published:2011/3/30 1:28:00 Author:may | Keyword: Colour TV power supply controller
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Published:2011/3/30 22:00:00 Author:may | Keyword: multiple system, PFC convertor
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Published:2011/3/30 22:55:00 Author:Ecco | Keyword: Infrared reflector type , electronic bell
The infrared reflector type of electronic bell, can transmit voice frequency semaphore to tell host that vistors are coming in definite distance. The bell is also a type of annunciator. The working principle is that infrared reflector type of electronic bell consisting of infrared emission circuitry, infrared receive circuitry, low frequency oscillator, audio oscillator, audio output circuitry. etc. According to the chart:
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Published:2011/3/30 22:21:00 Author:Ecco | Keyword: Clairaudit audiphone
The Clairaudit audiphone is composed of discrete component with simple structure and small volume. The circuit diagram is decided according the material object, it's provided forreference while coping now.
In the figure, microphone could receive aural signal. Q1 and Q2 make up second order audio amplifier. As power amplifier, Q3 amplifies the aural signalandlistened by stereophone, and Rp can rectify the volume. Under normal working circumstance, the voltage of Q1, Q2 is 0.5V, and the quiescent current is 10mA. When the voltage falls to 1.1 V, the sound in the earphone is still clear. (View)
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Published:2011/3/30 22:29:00 Author:Ecco | Keyword: hypnotic machine
Time base circuit 555 constitutes a low frequncy oscillator, to output a short pulse to make the speaker delivery be similar to the sound of raindrop . The speaker adopts 2 inches, 8 ohms small scaled moving ring. The velocity of the raindrop voice can pass 100 K potential machine to regulate to a suitable extent. If raising one simple clock switch in power supply, then power supply can be cut off in time after the user enters dreamland.
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Published:2011/4/21 1:05:00 Author:Nicole | Keyword: Ansco, camera
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Published:2011/4/20 21:58:00 Author:TaoXi | Keyword: Rising Edge, Triggered High-current Switch
The Rising Edge Triggered High-current Switch Composed of MIC5156-×× (View)
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Published:2011/4/21 2:31:00 Author:TaoXi | Keyword: 3.3V/lOA, Output Linear Regulator
The 3.3 V/lOA Output Linear Regulator Circuit Composed of MIC5157
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