Thursday, August 28, 2014
Power on time delay circuit
This schema is time delay schema to power on.Most of electrical equipments burn due to power failures so this schema is a best answer for that.
Note
# This schema operates with 12V power supply
The pair of transistors power amplifier
Already Know about the transistor above? transistor above is one of the transistors that are applied at the amplifier end audio amplifiers. Because the power output and good quality of this transistor is very popular with high-power amplifier makers.
Transistors on no other than is 2SC2922 and 2SA1216, transistor pair is already very well known as a reliable amplifier. With a price not too expensive and not too large transistor large is also very suitable. And this transistor has its own code for its quality, its code is like 5DY, 57P, 85Y, 92P, etc.. to see datsheet transistor can be seen below.
Maximum Voltage 180V
maximum collector current 17A
Total power output 200W
To more clearly and accurately datasheet can be found here.
Pure Sine Wave Inverter Using IC 555
The proposed schema generates accurately spaced PWM pulses which imitates a sine wave very closely and thus can be considered as good as its sine wave counter part design. Here we use two stages for creating the required PWM pulses, the stage comprising the ICs 741 and the other comprising the IC 555. Let’s learn the whole concept in details.
How the Circuit Functions – The PWM Stage
The schema diagram can be understood with the following points:
The two op amps are basically arranged to generate the required sample source voltages for the IC 555.
The couple of outputs from this stage is responsible for the generation of square waves and triangular waves.
The second stage which is actually the heart of the schema consists of the IC 555. Here the IC is wired in a monostable mode with the square waves from the op amp stage applied to its trigger pin #2 and the triangular waves applied to its control voltage pin # 5.
The square wave input triggers the monostable to generate a chain of pulses at the output where as the triangular signal modulates the width of this output square wave pulses.
The output from the IC 555 now follows the “instructions” from the op amp stage and optimizes its output in response to the two input signals, producing the sine equivalent PWM pulses.
Now it’s just a matter of appropriately feeding the PWM pulses to the output stages of an inverter consisting of the output devices, the transformer and the battery.
The Output Stage
The above PWM output is applied to the output stage as shown in the figure.
Transistors T1 and T2 receive the PWM pulses at their bases and switch the battery voltage into the transformer winding according to the duty cycles of the PWM optimized waveform.
The other two transistors make sure that the conduction of T1 and T2 takes place in tandem, that is alternately so tat the output o from the transformer generates one complete AC cycle with the two halves of the PWM pulses.
Parts List
R1, R2, R3, R8, R9, R10 = 10K,
R7 = 8K2,
R11, R14, R15, R16 = 1K,
R12, R13 = 33 Ohms 5 Watt,
R4 = 1M preset,
R5 = 150 K preset,
R6 = 1K5
R6 = 1K5
C1 = 0.1 uF,
C2 = 100 pF,
IC1 = TL 072,
IC2 = 555,
T1, T2 = BDY29,
T5, T6 = TIP 127,
T3, T4 = TIP122
Transformer = 12 – 0 – 12 V, 200 Watts,
Battery = 12 volts, 100 AH.
Source by Link
1999 Lincoln Continental Wiring Diagram
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| 1999 Lincoln Continental Wiring Diagram |
This is 1999 Lincoln Continental Wiring Diagram: fuse junction panel, autolamps, multifunction switch, hazard, lighting crtl module, shift lock actuator, hazard flasher, switch input, stoplamp, passenger, delaved exit, turn left/right
Fire Sensor Hamamatsu UVTRON
Fire Sensor (Hamamatsu UVTRON)
Read More..
UVTRON Hamamatsu R2868 is a sensor that detects a flame fire that emit ultraviolet light. Ultraviolet light emitted from a candle flame is a 5 meter can be detected by this sensor. This sensor can also detect some unseen phenomena such as high voltage transmission.
In order for this UVTRON sensors to connect to the system microcontroller then required a series of lawyer-signal condition that serves to change the response of UVTRON into pulses that can be recognized by the system microcontroller. With Module C3704 UVTRON response will then be processed into about 10 pulses mS and the maximum current 100mA. The output module uses the open configuration collector.
Simple AM FM SW MW booster Circuit
Note:
# Dont supply over 9V
# Build this schema on a PCB
# You can use NTE 451 or 2N4406 instead of MPF 102
ExpressPCB Software
Easy to learn and easy to use system manual PCB design.
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Despite the simplicity of the program, there are two small incremental guide for beginners and special tips for PCB layout in English.
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English-language program interface and localization system not.
Distribution of the program: Freeware
Official site ExpressPCB: http://www.expresspcb.com
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