Published:2011/4/26 20:35:00 Author:Nicole | Keyword: steady voltage, adjustable output voltage
In this circuit, the current I is decided by R2+RP+R1 branch resisitance, the current should be higher than the input currrent of operational amplifier, that is I=1mA. It also depends on the mimimum output voltage UAmin. When the voltage is adjusted to the maximum value, the current I becomes higher too. The resistance R1 should ensure the voltage on R1 higher than 0.5V, to stabilize the work range of operational amplifier. The lowest output voltage is determined by UR1+UR, UR is the integrated regulator constant voltage. The highest output voltage is decided by UE*(-US+UR2). If US=1.5V, UR2=1V, then Umax≈UE=-2.5V. (View)
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Published:2011/4/26 8:57:00 Author:TaoXi | Keyword: Multi-Channel Demodulator
This circuit is composed of the (View)
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Published:2011/4/26 20:05:00 Author:TaoXi | Keyword: pin functions and data
2.Pin functions and data circuit
The TDA8351 pin functions and data circuit is as shown in table 53.
Table 53. The TDA8351's pin functions and data
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Published:2011/4/26 18:32:00 Author:Christina | Keyword: Economy, Fluorescent Display, Filament Voltage
Most fluorescence filament code tubes of the calculator need to add the 6V DC and the several KHZ AC voltage (VP-P voltage), this circuit can meet the requirement.
As shown, 555 and R1, R2, C1form the astable-multivibrator, the oscillation frequency f=1.44/(R1+2R2), C1 is about 4KHZ. And the DC bias of the filament is VDD·R4/(R3+R4)≈6V.
Welcome to reprint, the information is from the Weiku Electronic Market Network (www.dzsc.com). (View)
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Published:2011/4/22 3:03:00 Author:Christina | Keyword: Remote, Voltage Regulator, On-off Function
When voltage Us>3V, transistor T2 turns on, and T1 turns on too; but when the Us<0.2V, T1 and T2 turn off. Actually the value of R1 and R2 is related to transistor T1,T2 and operating voltage, you need to adjust the value inexperiment. (View)
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Published:2011/4/26 20:14:00 Author:TaoXi | Keyword: Anti-interfere, voice control switch
The anti-interfere voice control switch circuit is as shown:
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Published:2011/4/26 8:54:00 Author:TaoXi | Keyword: digital hang-shaped, filter-type Y/C separation
The TC909OBN9 is designed as one kind of digital hang-shaped filter-type Y/C separation circuit which is produced by the TOSHIBA company, and this device can be used in new large-screen color TV sets.
1.Features
The TC909OBN9 is composed of the video A/D converter, the D/A converter, the I2C bus interface circuit, the PLL VCO circuit and the Y/C separation circuit.
2.Pin functions and data
The TC9090BN is in 28-pin dual in-line package, the pin functions and data is as shown in table 1.
Tip: If the digital Y/C circuit failure, please check the RC components outside the TC909OBN(20)-pin.
Table 1. The pin functions and data of the TC9090BN (View)
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Published:2011/4/22 4:26:00 Author:Christina | Keyword: Long-Time Disconnect, Delayer Circuit
If we combine the timer 555, optical isolator 1300 and the bridge trigger triac switch, and press the control switch to supply power to the AC motor or other devices for 1h, timer(2)'s voltage will be less than 1/3Vcc, the timer output power become high, so the LED turn-on. At the same time, the capacitor of (7) starts charging, and before the voltage is 2/3VCC, output power is still high; when the output power back to low, turn off the motor.
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Published:2011/4/26 18:37:00 Author:Christina | Keyword: Frequency deviation measurement
This circuit uses the same simple crystal oscillator and oscilloscope of carrier frequency deviation from center frequency with the fixed or adjustable FM receiver. The vertical amplifier of the oscilloscope uses the direct couple mode. To calibrate the tuned oscillator and display the figure higher than the receiver's second vibration 10KHZ or lower than the receiver's second vibration 15KHZ, we need to calibrate the oscilloscope screen. Because the transmitter's frequency is equal in the two channels, so we just need to adjust one oscilloscope.
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Published:2011/4/26 18:38:00 Author:Christina | Keyword: Movement Rear Projection TV, Konka 60P, Failure Protection
The Konka 60P Movement Rear Projection TV Failure Protection Circuit is as shown:
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Published:2011/4/24 21:12:00 Author:Christina | Keyword: Movement Power Supplier
The Hitachi NP8C Movement Power Supplier Circuit is as shown:
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Published:2011/4/26 20:08:00 Author:TaoXi | Keyword: High speed, Rise-edge triggered switch
The high speed Rise-edge triggered switch circuit is as shown:
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Published:2011/4/26 4:09:00 Author:Rebekka | Keyword: adjustable temperature limit , programmable hysteresis voltage
Thermal protection is very important in many power systems. Figure 1 shows a low-cost thermal protection circuit. LTC1998 is used for 6-pin battery monitoring SOT-23 package comparator. In this circuit it is used as heat protection. The thermal protection circuit can provide very useful features. Such as adjustable transition temperature, programmable hysteresis voltage and remote temperature sensing. When the detection point temperature rises. The voltage (Vbatt) of LTC1998 pin 1 will decline because of RT resistance. If Vbatt drops below 2.5V. The LTC1998 internal comparator transition changes, and Vbattlo (pin 6) turn to logic low. Pin 6 can be connected to the operation of the relevant power / soft-start (enable / shutdown) control side. Therefore, if the temperature rises to a pre-set trip point, you can turn off the power to prevent overheating.
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Published:2011/4/24 21:12:00 Author:Christina | Keyword: Remote Control Helicopter, Driver Circuit
The Circuit Of Remote Control Helicopter Driver Circuit is as shwon:
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Published:2011/4/26 18:42:00 Author:Christina | Keyword: Nanosecond pulse, detection
This circuit can detects the no-reproduce digital pulse of microsecond or nanosecond. The bistable IC sends the pulse information from the data input port to the Q output port, and this bistable IC uses the clock pulse along as the time base to stimulate the LED indicator.
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Published:2011/4/24 21:13:00 Author:Christina | Keyword: Two-way SCR, light control switch
The Two-way SCR light control switch circuit is as shwon:
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Published:2011/4/26 5:14:00 Author:Robert | Keyword: Squirrel Cage, Motor, Pole Changing, Speed Governing, Wiring
Squirrel Cage Motor Pole Changing And Speed Governing Wiring Circuit is shown above. (View)
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Published:2011/4/26 5:16:00 Author:Robert | Keyword: Ventilator, Auto Exhauster
Ventilator Auto Exhauster Circuit (1) is shown below:
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Published:2011/4/26 5:18:00 Author:Robert | Keyword: Squirrel Cage, Wound-Rotor, Asynchronous Motor
Squirrel Cage Wound-Rotor Asynchronous Motor Circuit is shown above. (View)
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Published:2011/4/26 5:48:00 Author:Robert | Keyword: Video, Switching
Video Switching Circuit is shown above. It is a16 points 1 video switching circuit. (View)
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