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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Tuesday, December 24, 2013

3 Channels Mini Mixer


Simple and cheap mixer circuit. This circuit supplied using 9V power supply. There is high/low-sensitivity switchable inputs for each input channel.

3 Channels Mini Mixer Circuit diagram :




Part List :

P1,P2,P3_________5K Linear Potentiometers

R1,R11,R15_____180K 1/4W Resistors
R2,R12,R16_______2M2 1/4W Resistors
R3,R13,R17_____750R 1/4W Resistors (See Notes)
R4,R14,R18_______1K 1/4W Resistors
R5______________15K 1/4W Resistor
R6_____________220R 1/4W Resistor
R7_______________1K5 1/4W Resistor
R8_____________820R 1/4W Resistor
R9_____________150R 1/4W Resistor
R10____________100K 1/4W Resistor

C1,C6,C8_________1µF 63V Polyester or Electrolytic Capacitors
C2,C4,C7,C9____100µF 25V Electrolytic Capacitors
C3,C5__________220µF 25V Electrolytic Capacitors

Q1,Q4,Q5______BC550C 45V 100mA Low noise High gain NPN Transistors
Q2____________BC547 45V 100mA General purpose NPN Transistor
Q3____________BC557 45V 100mA General purpose PNP Transistor

J1,J2,J3________3mm or 6mm Mono Jack sockets

SW1,2,3,4______SPST Toggle or Slider Switches

B1_______________9V PP3 Battery

Clip for PP3 Battery
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Sunday, December 22, 2013

Simple Positive Regulator Circuit Diagram

In the Simple Positive Regulator Circuit Diagram, Ql and Q2 are connected in the classic SCR or thyristor configuration. Where higher input voltages or minimum component count are required, the circuit for thyristor boost can be used. 

  Positive Regulator Circuit Diagram

 Positive Regulator Circuit Diagram


The thyristor is running in a linear mode with its cathode as the control terminal and its gate as the output terminal. This is known as the remote base configuration.
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Saturday, December 21, 2013

Tracking Dual Output Bipolar Supply Circuit Diagram

This Tracking Dual Output Bipolar Supply Circuit Diagram is useful for a bench supply in the lab. Separate or tracking operation is possible. The regulators should be properly heatsinked. Tl is a 24-Vac wall transformer of suitable current capacity. 

Tracking Dual Output Bipolar Supply Circuit Diagram 

Tracking Dual Output Bipolar Supply Circuit Diagram

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Thursday, December 19, 2013

Simple Photomultiplier Supply Circuit Diagram

This is a Simple Photomultiplier Supply Circuit Diagram and Cockcroft-Walton voltage multiplier supplies the stepped voltage required for the dynodes of the PMT without the power-wasting voltage- divider resistor string that is traditionally used.

Simple Photomultiplier Supply Circuit Diagram


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Wednesday, December 18, 2013

The warehouse needs more room to accommodate more Cell Phone Jammers

The warehouse needs more room to accommodate more Cell Phone Jammers .
Intelligently find nearby gas stations, restaurants, supermarkets and parking lots. In the long-distance travel in the car, no longer have to ask how to get high-speed ahead, out of which the intersection, as long as the marked destination, set the priority to high-speed road, will help you plan out where you want to go the best route. Such as Xinjiang from Beijing to self-driving tour, you can enter Urumqi. The warehouse of Cell Phone Jammers is near the subfactory.
When you deviate from the route has been selected, will prompt you off course, and it will automatically re-plan your route. The current map, there are more than 400 cities in the country a detailed map, a small county-level cities have, as well as the countrys highway network detailed map, as well as tourist zones, mountain maps. Mainly in travel, hiking, picnic, etc., when used to plan routes, indicating position, record tourist track. You can climb a Piedmont, mountain climbing using the previous track. GPS devices have the track record of features, such as Guilin, or you want to self-driving tour of Tibet, you can download someone elses track, then do not ask for directions, directly under the flight path travel. The warehouse of Cell Phone Jammers will be closed at four o’clock.
IE browser produced by Microsoft, a browser, and using free (and Win) bundled manner to the user, that is, as long as you use the Win family of operating systems would certainly have the IE browser, but also because So, IE has occupied the vast majority of personal computer browser share, other non-IE (core) browser such as Netscape NETSCAPE, OPERA and FIREFOX also individual users in general are rare. Is a low-power short-range wireless connectivity technology standard in lieu of that, "Bluetooth" is taken from a unified in the 10th century Danish king, Harald II, (Harald) of the nickname, the "Bluetooth" (Bluetooth). "Bluetooth" technology is the first five world-renowned advocate of computer and communications companies: Ericsson, Ericsson, International Business Machines IBM, Intel, Intel, Nokia Nokia, and Toshiba Toshiba. And in May 1998 set up a "Bluetooth" special interest group (Bluetooth Special Interest Group-SIG), the organization adopted a free transfer to industry of the patented technology strategy to achieve its goal of global harmonization of standards. The worker needs to get the needed Cell Phone Jammers before it is closed.
The goal is to achieve maximum data transfer speed 1Mbps (the effective transmission speed of 721kbps), the maximum transmission distance of 10 meters, the user can not have been allowed to use the 2.4GHz ISM (industrial, scientific, medical) band, set up in its 79 channel bandwidth of 1MHz, with a frequency of 1,600 times per second switching, hobbing (hobbing) mode technology to achieve spread spectrum radio transceiver. This is the origin and characteristics of Bluetooth technology. Bluetooth technology to communicate with the equipment, determine the frequency roll into gear mode "caller" and its communication opponent, "by taking sides." Caller before they take the same time by the parties and seven communication. Therefore, the caller can be taken together with the seven parties were famous for the 8 devices to connect Piconet (sawtooth network) subnet. Piconet taken by the parties within the same time as the subject to take more than two parties Piconet. In July 1999, announced the official Bluetooth specification BluetoothVersion 1.0. Comply with the specifications of cell phones and laptop computers will be listed in late 1999 or early 2000. Bluetooth technology products make claims that the companies are growing, the current Bluetooth standards bodies "BluetoothSIG (Special Interest mix)" members of the enterprises has increased to 800 or more.
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Monday, December 16, 2013

Simple Positive And Negative Voltage Power Supply Circuit Diagram

This Simple Positive And Negative Voltage Power Supply Circuit Diagram provides a precision voltage source that can be adjusted through zero to positive and negative voltages, which eliminates reversing connections on the power supply. Also, it is possible to get exactly 0 V, without some offset. As to how this circuit works, first consider the -1 V/V to +1 V/V linear gain-control amp (see the figure). A Burr-Brown INA105 difference amp is used in a unity-gain inverting amp configuration. 

 Positive And Negative Voltage Power Supply Circuit Diagram

Simple Positive And Negative Voltage Power Supply Circuit Diagram


A potentiometer is connected between the input and ground. The pot`s slider is connected to the noninverting input of the unity-gain amp; this input is typically connected to ground. With the slider at the bottom of the pot, the circuit is a normal-precision unity-gain inverting amp with a gain of -1.0 V/V ± 0.01% maximum. 

With the slider at the top of the pot, the circuit is a normal-precision voltage follower with a gain of ± 1.0 V/V ± 0.001% maximum. With the slider in the center, there`s equal positive and negative gain for a net gain of 0 V/V. The accuracy between the top and the bottom will usually be limited by the accuracy of the pot.

Source Simple Positive And Negative Voltage Power Supply Circuit Diagram
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