Saturday, January 11, 2014

Piezo Powered Lamp Circuit Schematics

Energy is becoming ever more expensive, and some fresh ideas are needed. There are already human-powered devices on the market, most of which employ a dynamo to generate power. It is also possible to recover energy from a piezo crystal of the sort found, for example, in the loudspeakers in greetings cards. Making use of this device is relatively straightforward.

Piezo-Powered Lamp Circuit Diagram :

Piezo-powered Lamp-Circuit Diagram

Piezo crystals can generate voltages of many tens of volts when given a firm enough prod with a finger to bend the  baseplate. The charge moved, however, is relatively small and the crystal is effectively a capacitor with a capacitance of only  around 20 nF to 50 nF. This means that we need larger-scale storage in the form of an electrolytic capacitor.

The piezo crystal can be treated as an alternating current source. We therefore need a rectifier and a reservoir capacitor. Pressing the metal surface of the transducer ten or twenty times with a finger will charge the electrolytic in steps to the point where it has enough charge to drive a LED. The circuit is a ‘charge pump’ in the full sense of the term.

When the button is pressed the electrolytic discharges into the LED, which emits a brief, but bright, flash of light.

Author : Burkhard Kainka - Copyright : Elektor

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Friday, January 10, 2014

cell phone jammers for the star gazing has very high requirement

 More  cell phone jammers  can be supplied.
5 74HC148 to allow expansion of the end of Gs, respectively, received the sixth piece of 74HC148 low slices to a high order of the film I 0, I 1, I 2, the I 3 I 4 input, I 5, I 6 I 7 end is connected to high (no input), so the sixth three-chip 74HC148 output would mean that the 40-6 line priority encoder of three the A5. A4, A3. 40-6 line priority encoder low three output A2, A1, A0 5 74HC148 output terminal. 74HC148s output is not tri-state gate, can not be directly connected together. 5 74HC148 output of the same name received 74LS30 (8-input NAND gate) can be taken with non-solve this problem. The good service of  cell phone jammers  can be got with the lowest cost.
Terminal expansion, and 2051 less than the 89C51 P0 and P2, input / output port and an external ROM, the RAM in the pin 2051 is only 20 feet. AT89C2051 microcontroller is mainly applicable to relatively simple micro-control system. In this system, used in the AT89C2051 the six external I / O port, an external interrupts and serial output port. 12 Hangzhou University of Electronic Science and Technology graduate design 4-92051 signal pin Figure 4.5-level translation in the different digital systems, the level of the standard is different. The system includes a TTL level standard and RS-232 level standards, to achieve two standard normal communication, the need for level conversion. The harmonious production environment of  cell phone jammers  is necessary.cell phone jammers for the star gazing has very high requirement
Can guarantee the quality of training and reducing the consumption of ammunition is the ideal of public security, military and other departments trained to use the analog targeting system. The laser targeting system overview of the laser targeting system [1-3] works by using laser pulses to simulate the firing of bullets, the system generally includes a laser transmitter and laser signal detection module, shooting performance and display parts. Shown in Figure 2-1, when the shooter aimed at the completion of the pull the trigger, the semiconductor laser emits laser pulses fired at the target on the photodetector, if you hit the target, the laser pulse photodetector receiver and converted to electric signal processing circuit can identify the point of impact of the shooting, transfer to your computer encoded signal is processed.

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10W Stereo Audio Amplifier Using TDA2009A

This is a schematic of a 10W stereo audio amplifier using TDA2009A amplifier IC. TDA2009A is a good IC provides quality sound. It has built in features like output current protection and thermal protection etc. The circuit can be operate between 8 to 24V DC with 1 to 2 amp here.

10W Stereo Audio Amplifier Circuit Diagram :

amplifier-circuit-diagram

If you want to operate this 10 watt amplifier circuit with watt amplifier circuit with mains supply then use a filtered and stable power supply to reduce mains hum. 10 watt out put power can be obtained by providing 20V 1.5A to the circuit. Use good and thick heatsink with the IC.

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Thursday, January 9, 2014

Ac to DC Converter Circuit Diagram

This Ac to DC Converter Circuit Diagram includes a PMOS enhancement-mode FET input buffer amplifier, coupled to a classical absolute value circuit which essentially eliminates the effect of the forward voltage drop across diodes D1 and D2. 

Ac to DC Converter Circuit Diagram

Ac to DC Converter Circuit Diagram

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The technology development of cell phone jammer has been finished

The technology development of cell phone jammer has been finished.
This mainly refers to the use of 25 ~ 100 W-class CO2 laser to X-Y table system-based laser processing machine models, but also the use of Nd YAG laser and galvanometer integrated machining. It can be carved, including engraving, cutting, engraving, embroidery and cutting. This has a variety of laser processing machine, the price is low, wide use, the characteristics of suitable conditions, the annual output of 6,000 units, which can be used in seals, flexible plates, gifts, advertising, printing cards, crafts and industrial non-metallic products, and on the horn, glass, plastic, rubber, wood products, plastics, fabrics, leather and other materials for laser processing. Because of this processing machine with computer typesetting, self-control, non-contact processing, fast (other than manual processing methods or faster), high intelligence, and other unique advantages of easy operation, it accounted for the majority of the domestic market and exported to Middle East, Southeast Asia, South America, Eastern Europe and Africa, popular with users. The technology development of cell phone jammer will enhance the quality of cell phone jammer .
Production of X-Y table models, high-profile companies in Zhejiang Boye Laser, Guangdong Yue Ming Wuhan Golden Laser Laser and other companies, the rapid rise of the formation of a laser processing machine of this type of production patterns. Currently Boye laser has been built 35000m2 plant, Golden Laser built a 10 000 m2 factory, Yueming laser not only further expand the production capacity of origin, established a branch in Shanghai. In addition to carving this type of flexible rubber, bamboo, it can also be laser-cut clothing, leather, embroidery and other processing products of these enterprises to upgrade and promote the market development. The technology development will improve the manufacturing quantity of cell phone jammer everyday.
These enterprises now will be feeding and rewinding, raw vacuum adsorption, automatic camera positioning, double cropping and other techniques to be applied gradually, the laser processing equipment can be integrated into automated garment production line operations, the product of intelligent upgrade. It is worth mentioning that the rapid development of laser engraving machine is one of the products, it is in the glass by laser-induced formation of burst point of the body composition of white three-dimensional laser light scattering images, this technology has recently made further development. Unit has developed a domestic color laser technology have played in the vitreous body red, orange, yellow, blue, purple and other color patterns, and soon the product will be put on the market, it will add luster to laser products. The technology improvement of cell phone jammer will increase the manufacturing ability of cell phone jammer .
Remanufacturing is the product life cycle theory as a guide for engineering practice. Equipment, feasibility studies, design, manufacture, use, maintenance and recovery of all costs are known as life-cycle cost, the traditional emphasis on the equipment, only the "first half", (this period only 20% to 40% of the cost), and often overlooked, "later life", that the use, maintenance and end of life costs.
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Friday, December 27, 2013

Park Aid Modification Circuit

Three-step beeps signal bumper-barrier distance, Infra-red operation, indoor use
This modification was designed on request: some people prefer an audible alert instead of looking at the LED display, making easier the parking operation. The original Park-aid circuit was retained, but please note that the input pins of IC2B, IC2C and IC2D are reversed. LEDs D5, D6 and D7, as also resistors R12, R13 and R14 are omitted. IC2B, IC2C and IC2D outputs drive resistors R15, R16 and R17 through D8, D9 and D10 respectively, in order to change the time constant of a low frequency oscillator based on the 555 timer IC4. This allows the Piezo sounder to start beeping at about 2 times per second when bumper-wall distance is about 20 cm., then to increase the beeps to about 3 per second when bumper-wall distance is about 10 cm. and finally to increase further the beeps frequency to more than 4 beeps per second when the distance is about 6 cm. or less.

Park-Aid Modification Circuit Diagram

Park-Aid Modification Circuit Diagram

Parts:
R15_____________3K3 1/4W Resistor
R16___________330K 1/4W Resistor
R17___________470K 1/4W Resistor
R18___________150K 1/4W Resistor
C6______________1µF 63V Electrolytic or Polyester Capacitor
D8,D9,D10____1N4148 75V 150mA Diodes
IC4_____________555 Timer IC
BZ1___________Piezo sounder (incorporating 3KHz oscillator)

Source : http://www.ecircuitslab.com/2011/06/park-aid-modification-circuit.html
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Wednesday, December 25, 2013

Simple Cmos Motorcycle Alarm Circuit Diagram

This Simple Cmos Motorcycle Alarm Circuit Diagram features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can immobilize the bike - flash the lights etc.

Cmos Motorcycle Alarm Schematic Diagram

Cmos Motorcycle Alarm Circuit Diagram

Notes
Any number of normally-open switches may be used. Fit "tilt" switches that close when the steering is moved or when the bike is lifted off its side-stand or pushed forward off its centre-stand. Use micro-switches to protect removable panels and the lids of panniers etc.

Once activated - the rate at which the siren switches on and off is controlled by R9 & C5. For example - increasing the value of C5 will slow it down - while reducing the value of R9 will make it faster.

While at least one switch remains closed the siren will sound. About thirty seconds after all of the switches have been opened, the alarm will reset. How long it takes to switch off depends on the characteristics of the actual components used. You can adjust the time to suit your requirements by changing the value of R6 and/or C4.

The circuit is designed to use an electronic Siren drawing 300 to 400mA. Its not usually a good idea to use the bikes own Horn because it can be easily located and disconnected. However, if you choose to use the Horn, remember that the alarm relay is too small to carry the necessary current. Connect the coil of a suitably rated relay to the "Siren" output. This can then be used to sound the Horn - flash the lights etc.

The circuit board and switches must be protected from the elements. Dampness or condensation will cause malfunction. Connect the 1-amp in-line fuse AS CLOSE AS POSSIBLE to your power source. This is VERY IMPORTANT. The fuse is there to protect the wiring - not the alarm. Exactly how the system is fitted will depend on the make of your particular machine - so Im unable to provide any further help or advice in this regard.

The quiescent (standby) current of the circuit is virtually zero - so there is no drain on the battery. If you want to operate the alarm manually use a key-switch or a hidden switch connected to the "off/set" terminals. For automatic operation connect a wire from the ignition circuit to the "ignit" terminal. Then every time you turn-off the ignition - the alarm will set itself. Remember that this wire from the ignition switch is not protected by your 1-amp inline fuse. So unless its run is very short - fit the wire with its own 1-amp fuse as close as possible to its source.

When you set the alarm - if one of the switches is closed - the siren will sound. This could cause annoyance late at night. A small modification will allow you to Monitor The State Of The Switches using LEDs. When the LEDs are all off - the switches are all open - and its safe to turn the alarm on.

Veroboard Layout

Cmos Motorcycle Alarm Circuit Diagram

 

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