Signal Processing

Shenlong fukang lighting and signal circuit diagram

Published:2013/12/25 19:27:00 Author: | Keyword: Shenlong fukang lighting and signal circuit diagram,

Shenlong fukang lighting and signal circuit diagram as shown below:   (View)

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Shenlong fukang interior lighting system circuit diagram

Published:2013/12/25 19:26:00 Author: | Keyword: Shenlong fukang interior lighting system circuit diagram,

Shenlong fukang interior lighting system circuit diagram as shown below:   (View)

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Shenlong fukang wiper and defrosting system circuit diagram

Published:2013/12/25 19:24:00 Author: | Keyword: Shenlong fukang wiper and defrosting system circuit diagram,

Shenlong fukang wiper and defrosting system circuit diagram as shown below:   (View)

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Shenlong fukang defrosting system circuit diagram

Published:2013/12/25 19:23:00 Author: | Keyword: Shenlong fukang defrosting system circuit diagram,

Shenlong fukang defrosting system circuit diagram as shown below:   (View)

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Shenlong fukang central door lock circuit diagram and electric Windows

Published:2013/12/25 19:20:00 Author: | Keyword: Shenlong fukang central door lock circuit diagram and electric Windows,

Shenlong fukang central door lock and electric Windows circuit diagram as shown below:   (View)

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Shenlong fukang air conditioner circuit diagram

Published:2013/12/24 20:15:00 Author: | Keyword: Shenlong fukang air conditioner circuit diagram,

Shenlong fukang air conditioner circuit diagram as shown below:   (View)

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Shenlong fukang anti-lock braking system (ABS) circuit diagram

Published:2013/12/24 20:12:00 Author: | Keyword: Shenlong fukang anti-lock braking system (ABS) circuit diagram,

Shenlong fukang anti-lock braking system (ABS) circuit diagram as shown below:   (View)

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Wing tiger 2005 electric rearview mirror circuit diagram

Published:2013/12/17 2:00:00 Author: | Keyword: Wing tiger 2005 electric rearview mirror circuit diagram,

Wing tiger 2005 electric rearview mirror circuit diagram as shown below:   (View)

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Wien bridge RC oscillator circuit

Published:2013/12/12 20:10:00 Author:lynne | Keyword: Wien bridge RC oscillator circuit,

Wien bridge RC oscillator circuit shown in Figure:   (View)

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Alto power start, ignition, heater, washing and wiper circuit diagrams

Published:2013/12/9 21:09:00 Author:lynne | Keyword: Alto power start, ignition, heater, washing and wiper circuit diagrams,

Alto power start, ignition, heater, washing and wiper circuit diagram is shown below:   (View)

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Alto steering, hazard warning lights, headlight washing and schematics

Published:2013/12/9 21:00:00 Author:lynne | Keyword: Alto steering, hazard warning lights, headlight washing and schematics

Alto steering, hazard warning lights, headlamp wash and circuit diagram is shown below:   (View)

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Alto air conditioning circuit diagram

Published:2013/12/9 20:54:00 Author:lynne | Keyword: Alto air conditioning circuit diagram,

Alto air conditioning circuit diagram is shown below:   (View)

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Citroen TU3F2K engine schematics

Published:2013/12/9 20:52:00 Author:lynne | Keyword: Citroen TU3F2K engine schematics,

Citroen TU3F2K engine circuit diagram is shown below:   (View)

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Citroen TU5JPK engine schematics

Published:2013/12/9 20:49:00 Author:lynne | Keyword: Citroen TU5JPK engine schematics,

Citroen TU5JPK engine circuit diagram is shown below:   (View)

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Simple Square Wave Generator with 7400

Published:2013/12/1 20:28:00 Author:lynne | Keyword: Simple Square Wave Generator

This is a very simple square wave generator circuit built with IC 74LS00 that can generate square signals with frequencies between 20 Hz and 1 MHz. Its stability is good enough for most applications. The output freq. is dimensioned through the RC components and time delay of the 3 inverter gates. The time delay of a logic gate is the elapsed time between a change of input state and the resulting change of the output state.To prevent the temperature and voltage supply from affecting the frequency of the square wave generator, the oscillator freq. fo must be smaller than 1/2tpn where: tp = average delay time of each gaten = the number of gates The above described oscillator has a tp of 10ns and n-3. The freq. is therefore: fo << 1/2tpn = 1/2*10ns*3 = 16.6MHz The voltage at the gate inputs varies from about _6V to -4V. The oscillation freq. can be made variable by using a 2.2KΩ potentiometer for R. Square wave generator circuit schematic   (View)

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Rain Sound Generator-Sleep Aid in Case of Insomnia

Published:2013/11/11 19:23:00 Author:lynne | Keyword: Rain Sound Generator

Insomnia treatment consist mostly of sleeping pills consumption but this circuit is an alternative for that and consists of a simple circuitry that generates a rain sound effect. The japanese researches were the first to discover that sound of rain has a relaxing effect. With the help of this simple circuit we can generate the rain sound which can be a sleep aid in case of insomnia.T1 is used as a noise generator and its signal is amplified by the 741 IC and thru T2, R7 and C4 goes to a headset with low resistance. If you do not want to use the headphones then use a speaker with impedance between 4 and 16 Ω. With the help of P1 can adjust sound level and with P2 the tone. Schematic of Rain Sound Generator Circuit   (View)

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Photoelectric Smoke Detector

Published:2013/9/26 20:22:00 Author:lynne | Keyword: Photoelectric Smoke Detector

This photoelectric smoke detector circuit uses one LED and 2 LDRs to detect the smoke and sound an alarm. The LM1801 IC is the best choice for this circuit because we need a few external components and is used in almost any smoke alarm. The whole photoelectric smoke detector circuit is powered from the 220V mains supply. D1 regulates the voltage, R1 decreases it until a proper level for the IC. C1 capacitor is filtering this voltage that is then stabilized with the zener diode inside LM1801. Physically, the LDRs must be installed so that the smoke particles reflects the light from the LED on LDR2, causing decrease in its resistance. When there is smoke between the LED and LDRs the IC switches the thyristor Th1 which activates the siren. The most difficult part in constructing this photoelectric smoke detector is to placement of LED and LDRs. Basically, the LED must be positioned exactly midway between the 2 LDRs, making sure there is no air flow between LED and LDR1. This can be accomplished by placing a transparent box around LDR1 and LED.The whole circuit sensitivity is adjustable with P1.   (View)

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Infrared Model Train Detector

Published:2013/8/22 20:13:00 Author:lynne | Keyword: Infrared Model Train Detector

This simple and economical IR model train detector circuit is intended especially for those hobbyists who wish to add a smart sensor to detect trains on their model railway track. As can be seen in the schematic diagram, it comprises of a simple infrared transmitter and receiver wired around the good old PLL Tone Decoder LM567(IC1). It has a working range of around 10 to 50 cm. Output of the detector is galvanically isolated with the help of a standard opto-coupler CNY18-2 (IC2), which can be suitably interfaced to any external circuit for further processing task(s). Working of the circuit is straight forward. When light from Infrared sender (D1) is relected by the wagon of the model train, IC1 through Infrared photo sensor (D2) receives the recovered signal at its input point (pin3). If PLL (IC1) is locked, its output (at pin8) drops low, thus disabling the optocoupler IC2 for the specific time and this process repeats based on the number of wagons. Infrared componets D1 and D2 should be mounted such that D2 can only pick up reflected light. When a train passes, the infrared light is reflected at certain intervals, which produces a sort of ‘pulse code’ for the train. Using an external circuit connected through IC2, it is possible to distinguish various model trains from each other using the pulse code! The choice of D1 and D2 is not very critical, but they must be band compatible. Operating point of the detector is dependent on refleted light levels and value of the resistor R2 (here 22K) may need to be ‘tuned’ for optimum performance.   (View)

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Electrical Live Wire Detector

Published:2013/8/21 21:46:00 Author:lynne | Keyword: Electrical Live Wire Detector

This circuit can detect only electrical wires connected to the mains (live wire). It has an LED for visual signalization and a buzzer for audio. As the electrician places the detector closer to the electrical wire the LED will flash at a higher frequency. As you can see the schematic of the wire detector circuit is quite simple. The first stage has the antenna in base of T1; capacitor C1 is used for filtering parasite high frequency signals which are captured by the antenna. The low freq signal is captured through C4 and is applied to the amplifier stage (T2) and then to the pulse shape filter made with R10, R11, C3 and T3, T4 and T5. The final stage (T5) is a current amplifier for the LED or you can place a buzzer too. The antenna is a pcb loop that look like in the schematic with length of 50 mm and width of 20 mm. The trace width has 4 mm.   (View)

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RF Spy Bug Detector Circuit

Published:2013/8/21 21:44:00 Author:lynne | Keyword: RF Spy Bug Detector Circuit

Here is a simple RF bug detector that will help you detect spy bugs and can operate up to 2 GHz. Below are some essential things required for this circuit: to cover a large frequency band make a sound during the detection optical and acustical indication when near the bug sensitivity not too high in order to accurately locate the rf bug consume as little current from battery A1, A2, A3, A4 = 1 x LM358 or CRX423 (14 pin types) It can detect any RF waves with frequencies up to 2 GHz due to antenna circuitry and to input amplifier stage that is made of BFR91A transistor. The amplification is pretty high because of the way the base is polarised. The RF signal detection is made with a Schottky diode that has a low voltage on junction and is operating at a high frequency. Further, the obtained voltage is filtered and amplified with A1. Its value is enough to be displayed on the scale of a microammeter. A2 and A3 sections together with the other components form a voltage controlled oscillator. The sound is amplified by A4 section and then is applied to a 8Ω/0.5W speaker. Use a telescopic antenna that can retract to a small length (~10cm) and can extend up to 1 meter.   (View)

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